2024-03-29T12:20:36Z
https://orgprints.org/cgi/oai2
oai:orgprints.org:21
2014-07-24T09:48:46Z
7374617475733D707562
7375626A656374733D34706C616E74:38706C616E746865616C7468
7375626A656374733D37666F6F64:327365637572697479
7375626A656374733D316F7267616E696373
7375626A656374733D326661726D696E67
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D35736F696C:31736F696C7175616C:32736F696C62696F6C
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/21/
Ecology of the ochratoxin A producing Penicillium verrucosum: Occurrence in field soil and grain with special attention to farming system and on-farm drying practices
Elmholt, Susanne
Crop health, quality, protection
Food security, food quality and human health
"Organics" in general
Farming Systems
Production systems
Soil biology
Mycotoxin contamination of organically grown cereals has been a growing concern during recent years, one of the most important being ochratoxin A (OTA). In countries with a temperate, humid climate, OTA is produced by Penicillium verrucosum and it is crucial to focus on the fungus to obviate problems. This paper presents results to elucidate different aspects of the ecology of P. verrucosum. In a survey of differently farmed soils, P. verrucosum was found in 11 out of 65 soils (35% of the organically and 7% of the conventionally cultivated), these being the first reports of its natural occurrence in soil. Except for two soils it was found with low frequencies (100-300 cfu g dry soil-1), and the results point to home grown seed as a potential risk of soil contamination. In a survey of organically grown grain, P. verrucosum was found in 51% of the recently combined and not yet dried grain samples (60% of the rye and 53% of the wheat samples). This confirms that early contamination does take place and increases the demand for proper grain handling during drying and storage. Three case studies were performed at organic farms with different storage facilities. The results showed very clearly that there is no general risk of OTA contamination in organically cultivated grain. Within the same year, major differences between the farms were found and these differences were reproduced during three growing seasons. It therefore seems likely that an organic farming system, as such, does not present problems in relation to OTA contamination. It is, rather, certain management practices that are inappropriate and these management practices may be more prevalent in organic farming. This assumption is discussed in relation to home grown seed, crop rotation, organic fertilizers, exclusion of pesticides, and drying and storage facilities.
2003
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/21/1/21.pdf
Elmholt, Susanne (2003) Ecology of the ochratoxin A producing Penicillium verrucosum: Occurrence in field soil and grain with special attention to farming system and on-farm drying practices. Biological Agriculture and Horticulture, 20, pp. 311-337.
oai:orgprints.org:27
2010-04-12T07:27:12Z
7374617475733D707562
7375626A656374733D34706C616E74:706F737468617276657374
7375626A656374733D37666F6F64:327365637572697479
7375626A656374733D326661726D696E67
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D7265706F7274
https://orgprints.org/id/eprint/27/
Korn uden mykotoksiner (Grain without mycotoxins)
Elmholt, Senior Scientist Susanne
Kristensen, Scientist Erik F.
Post harvest management and techniques
Food security, food quality and human health
Farming Systems
Cereals, pulses and oilseeds
På verdensplan udgør mykotoksin forureninger af korn en risiko for mængde og kvalitet af fødevarer, foder og forarbejdede landbrugsprodukter (Smith et al., 1994). Mykotoksiner er naturlige stoffer, der produceres af svampe. De udløser en toksisk respons – mykotoksicosis - når de indtages af dyr og mennesker. Mange fødevare- og foderbårne svampe producerer et eller flere toksiner. Nogle produceres kun af få arter, andre dannes af mange forskellige arter, der endog kan tilhøre forskellige svampeslægter. Mere end 300 mykotoksiner er identificeret under laboratorieforhold, men kun 20 optræder naturligt i mængder og med frekvenser, så de er til fare for fødevaresikkerheden (Smith et al., 1994). Nogle mykotoksiner, som aflatoksin, forurener hovedsageligt afgrøder i varme lande og findes i EU på importerede produkter. Andre, som ochratoksin A, zearalenon og trichothecener findes i afgrøder, der er produceret i tempererede europæiske lande. Kun disse stoffer omtales i det følgende
2001
Report
NonPeerReviewed
application/pdf
en
/id/eprint/27/1/Korn_uden_mykotoksiner_%28Grain_without_mycotoxins%29.pdf
Elmholt, Senior Scientist Susanne and Kristensen, Scientist Erik F. (2001) Korn uden mykotoksiner (Grain without mycotoxins). DJF report, no. 53. Danish Institute of Agricultural Sciences , Department of Crop Physiology and Soil Science and Department of Agricultural Engineering.
oai:orgprints.org:30
2014-07-02T13:03:01Z
oai:orgprints.org:33
2012-08-07T11:39:49Z
oai:orgprints.org:37
2014-07-24T10:06:15Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/37/
Evaluating pea and barley cultivars for complementarity in intercropping at different levels of soil N availability
Hauggaard-Nielsen, Henrik
Jensen, Erik Steen
Crop combinations and interactions
Cereals, pulses and oilseeds
Two field experiments were carried out on a temperate sandy loam using six pea (Pisum sativum L.) and five spring barley (Hordeum vulgare L.) cultivars to determine cultivar complementarity in the intercrop for grain yield, dry matter production and nitrogen (N) acquisition. Crops were grown with or without the supply of 40 or 50 kg N ha-1 in the two experiments. Cultivars were grown as sole crops (SC) and as mixed intercrops (IC) using a replacement design (50:50). The Land Equivalent Ratio (LER), which is defined as the relative land area under sole crops that is required to produce the yields achieved in intercropping, were used to compare cultivar performance in intercropping relative to sole cropping.
Barley was the stronger competitor in the intercrops and as a result barley grain yield and nitrogen uptake in IC were similar to SC. The per plant pea grain production and aboveground N accumulation in IC were reduced to less than half compared to SC pea plants due to competitive interactions.
Application of N caused a dynamic change in the intercrop composition. Competition from barley increased with N application and the pea contribution to the combined intercrop grain yield decreased. The LER values showed that in the intercrop plant growth resources were used on average 20% more efficient without N application and 5-10% more efficient with N application.
The choice of pea cultivar in the intercrop influenced the intercrop performance to a larger degree than the choice of barley cultivar. Furthermore, pea cultivar ´ cropping systems interactions was observed, indicating that cultivars performed differently in sole and intercrops. An indeterminate pea cultivar competed strongly with barley causing a greater proportion of peas in the intercrop yield, but caused a reduced N uptake and yield of barley. Determinate peas with normal leaves caused the highest degree of complementary use of N sources by allowing barley to exploit the soil N sources efficiently, while they contribute with fixed N2. However, difference in performance among cultivars was observed. Using the indeterminate pea cultivar combined IC grain yield was in general lower than the greatest sole crop yield and visa versa for the determinate pea cultivars. Up to 22% (LER = 1.22) greater combined IC grain yield was observed in several mixtures using determinate pea cultivars.
From the present study is was concluded that there is a need for breeding suitable pea cultivars for intercropping purposes, since cultivars bred for sole cropping may not be the types, which are the most suitable for intercropping. For optimised N-use in pea-barley intercrops it is concluded that important traits for the intercropped pea are: 1) determinate growth, 2) a medium competitive root system for soil inorganic N and other nutrients during early growth, 3) high light absorption capacity by peas growing underneath the canopy of the higher barley component and 4) early establishment of symbiotic N2 fixation to support a high growth rate during early growth stages.
Fertilized pea-barley intercrops gave a 15% higher net income than fertilized barley sole cropping and is regarded as a better safeguard for the farmer’s earnings compared to pea sole cropping known for variable yields and poor competitive ability towards weeds.
Elsevier
2001
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/37/1/cultivar.pdf
Hauggaard-Nielsen, Henrik and Jensen, Erik Steen (2001) Evaluating pea and barley cultivars for complementarity in intercropping at different levels of soil N availability. Field Crops Research, 72 (3), pp. 185-196.
oai:orgprints.org:41
2014-07-24T10:28:50Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/41/
Temporal and spatial root distribution and competition for nitrogen in pea-barley intercropping – a field study employing 32P methodology
Hauggaard-Nielsen, Henrik
Ambus, Per
Jensen, Erik Steen
Crop combinations and interactions
Cereals, pulses and oilseeds
Root system dynamics, productivity and N use were studied in inter- and sole crops of field pea (Pisum sativum L.) and spring barley (Hordeum vulgare L.) on a temperate sandy loam. A 32P tracer placed at a depth of 12.5, 37.5, 62.5 or 87.5 cm was employed to determine root system dynamics by sampling crop leaves at 0, 15, 30 and 45 cm lateral distance. 15N addition was used to estimate N2 fixation by pea, using sole cropped barley as reference crop. The Land Equivalent Ratio (LER), which is defined as the relative land area under sole crops that is required to produce the yields achieved in intercropping, were used to compare the crop growth in intercrops relative to the respective sole crops.
The 32P appearance in leaves revealed that the barley root system grows faster than that of pea. P uptake by the barley root system during early growth stages was approximately 10 days ahead of that of the pea root system in root depth and lateral root distribution. More than 90% of the P uptake by the pea root system was confined to the top 12.5 cm of soil, whereas barley had about 25-30% of tracer P uptake in the 12.5 to 62.5 cm soil layer. Judging from this P uptake intercropping caused the barley root system to grow deeper and faster lateral root development of both species was observed. Barley accumulated similar amounts of aboveground N when grown as inter- and sole crop, whereas the total aboveground N acquired by pea in the intercrop was only 16% of that acquired in the pea sole crop. The percentage of total aboveground N derived from N2 fixation in sole cropped pea increased from 40% to 80% during the growth period, whereas it was almost constant at 85% in intercropped pea. The total amounts of N2 fixed were 95 and 15 kg N ha-1 in sole cropped and intercropped pea, respectively. Barley was the dominant component of the pea-barley intercrop, obtaining 90% of its sole crop yield, while pea produced only 15% of the grains of a sole crop pea. Intercropping of pea and barley improved the utilization of plant growth resources (LER > 1) as compared to sole crops. Root system distribution in time and space can partly explain interspecific competition. The 32P methodology proved to be a valuable tool for determining root dynamics in intercropping systems.
Kluwer
2001
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/41/1/final32P.pdf
Hauggaard-Nielsen, Henrik; Ambus, Per and Jensen, Erik Steen (2001) Temporal and spatial root distribution and competition for nitrogen in pea-barley intercropping – a field study employing 32P methodology. Plant and Soil, 236 (1), pp. 63-74.
oai:orgprints.org:48
2014-07-24T10:34:13Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/48/
Interspecific competition, N use and interference with weeds in pea-barley intercropping
Hauggaard-Nielsen, Henrik
Ambus, Per
Jensen, Erik Steen
Crop combinations and interactions
Cereals, pulses and oilseeds
Field pea (Pisum sativum L.) and spring barley (Hordeum vulgare L) were inter- and sole cropped to compare the effects of crop diversity on productivity and use of N sources on a soil with a high weed pressure. 15N enrichment techniques were used to determine the pea-barley-weed-N dynamics. The pea-barley intercrop yielded 4.6 t grain ha-1, which was significantly greater than the yields of pea and barley in sole cropping. Calculation of Land Equivalent Ratios showed that plant growth factors were used from 25 to 38% more efficiently by the intercrop than by the sole crops. Barley sole crops accumulated 65 kg soil N ha-1 in aboveground plant parts, which was similar to 73 kg soil N ha-1 in the pea-barley intercrop and significantly greater than 15 kg soil N ha-1 in the pea sole crop. The weeds accumulated 57 kg soil N ha-1 in aboveground plant parts during the growing season in the pea sole crops. Intercropped barley accumulated 71 kg N ha-1. Pea had to rely on N2 fixation with 90-95% of aboveground N accumulation being derived from N2 fixation independent of cropping system. Pea grown in intercrop with barley instead of sole crop had a better competitive ability towards weeds and soil inorganic N was consequently used for barley grain production instead of weed biomass. There was no indication of a greater inorganic N content after pea compared to barley or pea-barley. However, 46 days after emergence there was about 30 kg N ha-1 inorganic N more under the pea sole crop than under the other two crops. Such greater inorganic N levels during early growth phases was assumed to induce aggressive weed populations and interspecific competition. Pea-barley intercropping seems to be a promising practise of protein production in cropping system with high weed pressures and low levels of available N.
Elsevier
2001
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/48/1/final.pdf
Hauggaard-Nielsen, Henrik; Ambus, Per and Jensen, Erik Steen (2001) Interspecific competition, N use and interference with weeds in pea-barley intercropping. Field Crops Research, 70 (2), pp. 101-109.
oai:orgprints.org:49
2010-04-12T07:27:12Z
7374617475733D707562
7375626A656374733D35736F696C:31736F696C7175616C
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D35736F696C:31736F696C7175616C:32736F696C62696F6C
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/49/
Biotic and abiotic binding and bonding mechanisms in soils with long-term differences in management
Elmholt, Susanne
Munkholm, Lars J.
Debosz, Kasia
Schjønning, Per
Soil quality
Production systems
Soil biology
During the last decades Denmark has experienced a growing interest in low-input farming systems like organic farming. These systems rely on a high soil fertility to maintain nutrient availability and plant health. Soil aggregation contributes to this fertility, because it is crucial to soil porosity, aeration and infiltration of water. This paper reports a study of two pairs of differently managed, neighboring fields. The aim was to elucidate long-term effects of the different farming systems on physical and biological variables with influence on bonding and binding mechanisms of soil aggregation. Each pair consists of an organically grown dairy farm soil, based on a forage crop rotation system, including grass (Org-FCS(G)) and a conventionally managed soil. One of the conventional farms has a forage crop rotation with annual cash crops and no grass (Conv-FCS(NG)) and one has been grown continuously with small grain cereals and rape (Conv-CCS). Our results indicate that the Org-FCS(G) soils stimulate biotic soil aggregating agents as measured by extracellular polysaccharides (EPS) and hyphal length measurements, respectively. Generally, the Conv-CCS soil, which relies exclusively on synthetic fertilisers and cereal production, offered poor conditions for the biotic binding and bonding agents. Nevertheless this soil contained a large amount of stable macro-aggregates. This is explained by the physical results, which indicated that the strong macro-aggregation was due to clay dispersion and cementation processes rather than to biotic processes.
Danish Institute of Agricultural Sciences
Elmholt, Susanne
Stenberg, Bo
Grønlund, Arne
Nuutinen, V.
2000
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/49/1/manus3ny.pdf
Elmholt, Susanne; Munkholm, Lars J.; Debosz, Kasia and Schjønning, Per (2000) Biotic and abiotic binding and bonding mechanisms in soils with long-term differences in management. In: Elmholt, Susanne; Stenberg, Bo; Grønlund, Arne and Nuutinen, V. (Eds.) DIAS report, Danish Institute of Agricultural Sciences, 38, pp. 53-62.
oai:orgprints.org:50
2010-04-12T07:27:13Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/50/
Reintroducing grain legume-cereal intercropping for increased protein production in European cropping systems
Hauggaard-Nielsen, Henrik
Ambus, Per
Jensen, Erik Steen
Crop combinations and interactions
Cereals, pulses and oilseeds
The experiments demonstrated the potential of pea-barley intercropping as a means of introducing complementary N use by increasing the proportional input of pea fixed N2, increasing the protein production and reducing weed problems in systems without herbicide use.
AEP - European association for grain legume research
2001
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/50/1/rev-101-.pdf
Hauggaard-Nielsen, Henrik; Ambus, Per and Jensen, Erik Steen (2001) Reintroducing grain legume-cereal intercropping for increased protein production in European cropping systems. In: Proceedings of the 4th European Conference on Grain Legumes, AEP - European association for grain legume research, pp. 52-53.
oai:orgprints.org:52
2020-04-27T12:42:21Z
7374617475733D707562
7375626A656374733D35736F696C:31736F696C7175616C
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D6B6E6F776C65646765:397265736561726368
7375626A656374733D34706C616E74:3474696C6C616765
7375626A656374733D35736F696C:31736F696C7175616C:32736F696C62696F6C
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/52/
Soil structure dynamics: Effects of management and water content
Munkholm, Lars J.
Schjønning, Per
Elmholt, Susanne
Soil quality
Production systems
Research methodology and philosophy
Soil tillage
Soil biology
A review is given of the last 5 years research on soil structure dynamics carried out at the Danish Institute of Agricultural Sciences. The studies were initiated as part of a large programme focussing on the development of organic farming in Denmark. In organic farming a healthy and living soil is highly valued. Holistic thinking is also a key element in the organic farming concept. In order to integrate a holistic thinking in our soil structure research a multidisciplinary approach was adapted that integrated soil physics, chemistry and microbiology. In addition, soil structure was studied at different levels from undisturbed “whole soil” in the field to specialized reductionistic studies using size separated or remoulded soil in the laboratory. In a recent project our aim was to study long-term effects of different management strategies on soil mechanical and pore system characteristics. Our aim was also to be able to relate these soil tilth characteristics to abiotic and biotic soil structure forming and stabilizing processes. Results regarding the long-term effect of crop rotation and manure application are presented together with results regarding the short-term effect of tillage and traffic. Lastly, hypothesis and objectives of our running project is presented.
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/52/1/canada.pdf
Munkholm, Lars J.; Schjønning, Per and Elmholt, Susanne (2002) Soil structure dynamics: Effects of management and water content. Paper at: Advances in Soil Structure Research workshop, Prince Edward Island, Canada, July 7-9 2002.
oai:orgprints.org:56
2010-04-12T07:27:13Z
7374617475733D707562
7375626A656374733D35736F696C:31736F696C7175616C
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3474696C6C616765
7375626A656374733D6B6E6F776C65646765:397265736561726368:346D6574686F6473
7375626A656374733D35736F696C:31736F696C7175616C:32736F696C62696F6C
74797065733D746865736973
https://orgprints.org/id/eprint/56/
Soil Fragmentation and Friability. Effects of Soil Water and Soil Management
Munkholm, Lars J.
Soil quality
Production systems
Soil tillage
Specific methods
Soil biology
Soil fragmentation is a primary aim in most tillage operations in order to create a soil environment favourable for crop establishment and growth. Soils vary around the world from those exhibiting a self-mulching nature to those of a hardsetting nature. These extremes have been reported for Australian and other tropical and subtropical soils. In humid temperate climates, soil tillage is generally needed in order to produce a favourable environment for crop establishment and growth. The ease of preparing a favourable arable layer depends on complex interactions between climate, soil and the tillage implement. Especially soil water affects soil strength and fragmentation properties and thereby the ease of preparing a suitable arable layer. Soil management affects soil fragmentation and friability indirectly through effects on soil structure formation and stabilization and directly through the influence of soil tillage and traffic. The overall purpose of this thesis is to contribute to the understanding of soil fragmentation and friability as affected by soil management and soil water regime. The reaction of the soil upon tillage was evaluated within the concept of soil tilth as defined by Soil Science Society of America (SSSA) "the physical condition of soil as related to its ease of tillage, fitness as a seedbed, and its impedance to seedling emergence and root penetration".
The study involved soils from two case studies, the Askov long-term experiment on animal manure and mineral fertilizers, a field experiment with non-inversion tillage and a field experiment on compaction and intensive tillage. All the soils included in the study were humid sandy loams predominantly developed on Weichselian glacial moraine deposits. The soils were classified as Oxy aquic Agriudolls/Glossic Phaeozems according to Soil Taxonomy/WRB except for the Askov soil that was classified as Ultic Hapludalfs/Dystric Luvisols according to Soil Taxonomy/WRB. For all soils the clay content ranged from about 12 to 21 g per 100g-1 and soil organic matter ranged from 1.8 to 3.9 g 100g-1. The case studies included two long-term forage cropping system soils with a grass ley in the crop rotation (DFG(1) and DFG(2)), which were compared with a neighbouring counterpart. DFG(1) was compared with a forage cropping system soil without grass ley in the crop rotation (i.e., only annual crops), labelled DFA, whereas DFG(2) was compared with a continuously cash cropped soil with very low input of organic matter (no animal manure and straw removed), labelled CCC. An unfertilized (UNF), animal manured (AM) and a mineral fertilized (NPK) soil was included from the Askov long-term experiment on animal manure and mineral fertilizers established in 1894. The tillage experiment included a non-inversion tilled soil, labelled NINV, (non-inversion subsoil loosening to 35 cm depth and seedbed preparation with rotovator) and a conventionally tilled soil, labelled CONV, (mouldboard ploughing to 22 cm and secondary tine cultivation). The experiment on soil compaction and intensive tillage involved two "extreme" tillage and traffic treatments and a reference treatment (REF). The extreme treatments were soil compaction (PAC) and intensive tillage (INT) that were performed on wet soil just after spring ploughing and prior to seedbed preparation. The field experiments on non-inversion tillage, and soil compaction and intensive tillage were both conducted at the organically managed Rugballegård Research Station.
Ease of tillage is commonly extrapolated from measurement of tensile strength in a compression test using air-dry or oven-dry aggregates. This procedure may lead to erroneous conclusion on soil behaviour of moist soil in the field. Therefore a multi-level analytical strategy was followed, i.e., soil fragmentation and friability were characterized using qualitative and quantitative in situ, on-field and laboratory methods.
Soil fragmentation and friability were assessed in the field qualitatively by visual examination and quantitatively by employing a simple drop-shatter fragmentation test, denoted soil drop test. The energy input in the soil drop test was low in comparison with the energy input in typical seedbed cultivation. However, the soil drop test was sensitive enough to display significant differences between treatments in most cases. In the laboratory soil fragmentation and friability were evaluated by measuring tensile strength and specific rupture energy on field-sampled aggregates. In general, tensile strength was determined on air-dry aggregates and in some cases on aggregates adjusted to pressure potentials in the range -100 hPa to -166 MPa (air-dry). In addition, a direct tension test was developed to measure tensile strength of moist soil without making assumptions on the mode of failure. Undisturbed field-sampled soil cores were used in the test. The method was applicable at high matric potentials (-50 and -100 hPa) but not at -300 hPa. The direct tension test results corresponded well with the predicted values determined from the indirect measurements of aggregate tensile strength.
In general, a fairly good agreement was found between the different methods in the hierarchy of methods applied. This indicates that sophisticated laboratory methods for assessing soil strength and fragmentation characteristics may well be used for evaluating soil behaviour under conditions prevailing in the field at the time of tillage. Nevertheless, it is recommended that laboratory methods are evaluated by using simple field methods at times and soil conditions appropriate for tillage.
The friability index showed in general a low sensitivity to long- and short-term differences in soil management. However, a clear effect of soil water was found, i.e. maximum friability index values at -300 to -1000 hPa pressure potential.
The effect of soil water on tensile strength and specific rupture energy of aggregates and on estimation of friability was investigated. As expected the study revealed the paramount influence of soil water. Interactions between soil water regime and treatment were found for cropping system soils (DFG(2) vs. CCC) and the fertilization treatments (UNF, NPK and AM) but not for the compaction treatments (PAC vs. REF). It was concluded that it might be hazardous to characterize soil fragmentation and friability properties of different treatments based on measurements at a single pressure potential and significant influence of pore characteristics was detected. Macroporosity was found to correlate to tensile strength and friability index. However, a clear correlation between tensile strength properties and pore geometry characteristics (e.g. tortuousity and continuity) was not shown. This may be due to large small-scale variations in these properties, i.e. the samples for tensile strength determination were taken next to the samples for pore characterization.
Marked long-term effects of cropping systems and fertilization were found. For two neighbouring soils with a high input of organic matter, poorer soil mechanical characteristics were found for a soil with grass in the rotation (DFG(1)) than for a soil solely grown with annual crops (mainly cereals). This difference in strength and friability characteristics may be related to a higher amount of biological structural binding and bonding agents in the soil with grass included in the rotation. Two soils with high inputs of organic matter (DFG(2) and AM) displayed more desirable aggregate strength and soil fragmentation characteristics than their counterparts (CCC and UNF, respectively) receiving low inputs of organic matter. Evidence suggests that cementation of dispersed clay was a determining factor for the stronger increase in aggregate tensile strength with increased dryness (decreased pressure potential) found for the CCC and UNF soils receiving low inputs of organic matter compared with DFG(2) and AM.
An early-stage effect of non-inversion tillage treatment (NINV) resulted in a poorer soil tilth in the topsoil layer (i.e., higher soil strength and lower ease of fragmentation and friability index) than for a conventionally mouldboard ploughed soil (CONV). Surprisingly, the effect of tillage on topsoil tilth was clearer by the end of the growing season in September than in May. This indicates that natural soil processes occurring during the growing season were not able eliminate the differences between the primary tillage treatments.
Soil compaction (PAC) resulted in strongly increased aggregate tensile strength at all the investigated water regimes (i.e., pressure potentials: -100 hPa to -166 MPa) in comparison with a reference treatment (REF). Surprisingly, soil compaction did not significantly affect the specific rupture energy of the aggregates. This was related to a clear difference in the stress-strain relationship for the soils. Aggregates from the compacted soil failed at higher stress but at lower strain than aggregates from the reference soil (i.e., higher Young modulus, (Y/()). This was characteristic for all size-classes and at all pressure potentials.
The results obtained in this study indicate that the prediction of soil fragmentation from tensile strength properties of soil elements may be very complex. We need more basic understanding of the fragmentation of "unconfined" soil at the different size-scales (aggregates to bulk soil) and the correlation between the different scales in order to be able to predict soil fragmentation in tillage (mainly superficial tillage) from a priori information. More specifically, the role of soil biology and soil water and pore characteristics needs to be studied in further detail.
The development of new methods and the application of well-know methods to quantify soil fragmentation and friability of soil at conditions similar to soil conditions at tillage (including water content) has been a primary aim in this thesis. However, there is still a strong need to develop new methods and modify existing methods to quantify soil fragmentation and friability under controlled conditions.
This study shows that soil compaction and intensive tillage significantly influence soil fragmentation and friability. Increasingly heavier machinery and - to some extent - more intensive seedbed preparation (PTO-driven implements) are being used in Danish agriculture. A thorough evaluation of this development on soil fragmentation and friability is needed. Furthermore, the accumulated knowledge of soil fragmentation and tensile failure in soil ought to be implemented in the design of new tillage implements.
Danish Institute of Agricultural Sciences
2002
Thesis
NonPeerReviewed
application/pdf
en
/id/eprint/56/1/Lars_samle_syntese.pdf
Munkholm, Lars J. (2002) Soil Fragmentation and Friability. Effects of Soil Water and Soil Management. Thesis, Danish Institute of Agricultural Sciences , Department of Crop Physiology and Soil Science. Danish Institute of Agricultural Sciences.
oai:orgprints.org:58
2010-04-12T07:27:13Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/58/
Pea-barley intercrop N dynamics in farmers fields
Hauggaard-Nielsen, Henrik
Peoples, Mark B.
Andersen, Mette K.
Nielsen, Anders H.
Jensen, Erik S.
Cereals, pulses and oilseeds
Knowledge about crop performances in farmers’ fields provides a link between on-farm practice and re-search. Thereby scientists may improve their ability to understand and suggest solutions for the problems facing those who have the responsibility of making sound agricultural decisions.
Nitrogen (N) availability is known to be highly heterogeneous in terrestrial plant communities (Stevenson and van Kessel, 1997), a heterogeneity that in natural systems is often associated with variation in the distri-bution of plant species. In intercropping systems the relative proportion of component crops is influenced by the distribution of growth factors such as N in both time and space (Jensen, 1996). In pea-barley intercrops, an increase in the N supply promotes the growth of barley thereby decreasing the N accumulation of pea and giving rise to changes in the relative proportions of the intercropped components (Jensen, 1996). The pres-sure of weeds may, however, significantly change the dynamics in intercrops (Hauggaard-Nielsen et al., 2001). Data from farmers’ fields may provide direct, spatially explicit information for evaluating the poten-tials of improving the utilisation of field variability by intercrops.
INRA - National Institute for Agricultural Research
2001
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/58/1/Rev-Hauggaard-Nielsen-11NW.pdf
Hauggaard-Nielsen, Henrik; Peoples, Mark B.; Andersen, Mette K.; Nielsen, Anders H. and Jensen, Erik S. (2001) Pea-barley intercrop N dynamics in farmers fields. In: 11th Nitrogen Workshop - Book of Abstracts, INRA - National Institute for Agricultural Research, 11th Nitrogen Workshop - Book of Abstracts.
oai:orgprints.org:61
2014-07-24T10:40:46Z
7374617475733D707562
7375626A656374733D34706C616E74:33636F6D706F7374
7375626A656374733D35736F696C:31736F696C7175616C
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3474696C6C616765
7375626A656374733D326661726D696E67
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/61/
Soil mechanical behaviour of sandy loams in a temperate climate: case studies on long-term effects of fertilization and crop rotation.
Munkholm, Lars J.
Schjønning, Per
Petersen, Carsten T.
Composting and manuring
Soil quality
Production systems
Crop combinations and interactions
Soil tillage
Farming Systems
Two case studies on Danish sandy loams investigated long-term effects of fertilization and crop rotation. Case Study 1 compared a diversely cropped organically farmed soil (DFG(1)) with a conventionally farmed soil predominantly growing annual crops (DFA), both receiving animal manure. In Case Study 2, a diversely cropped organically managed soil DFG(2)) receiving animal manure was compared with an almost exclusively cereal cropped conventionally farmed soil receiving no animal manure (CCC). A multi-level experimental strategy was followed to compare integrating field methods with specialized laboratory methods. Ease of tillage was described in the field and characterized using a drop shatter field test and by measuring aggregate tensile strength. Fitness as a seedbed was characterised visually in the field and from the drop shatter test. Impedance to seedling emergence and root penetration was evaluated by measuring bulk soil shear strength. For Case Study 1, soil tilth was better for the DFA soil than for the DFG(1) soil (i.e. lower soil strength and higher ease of fragmentation and friability index for DFA). However, a crumbly structure and a moderate bulk density suggested that the DFG(1) soil was also a favourable medium for plant growth. For Case Study 2, the CCC soil had a lower organic matter content, higher bulk density, higher soil strength, and lower ease of fragmentation in comparison with the DFG(2) soil.
2001
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/61/1/Soil_mechanical.pdf
Munkholm, Lars J.; Schjønning, Per and Petersen, Carsten T. (2001) Soil mechanical behaviour of sandy loams in a temperate climate: case studies on long-term effects of fertilization and crop rotation. Soil Use and Management, 17, pp. 269-277.
oai:orgprints.org:102
2010-04-12T07:27:14Z
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/102/
Blandingsafgrøder med korn og bølgsæd – erfaringer og nye udfordringer
Hauggaard-Nielsen, Henrik
Cereals, pulses and oilseeds
Temaaften og markvandring om
Dyrkning af proteinafgrøder
Tirsdag den 6. august kl. 19.00 på Rugballegård
19.00-20.40 Markvandring
19.00-19.20 Velkomst og indledning
ved Morten Priesholm, Økologisk Landsforening
19.20-20.40 Markvandring
ved Frank Oudshoorn, Rugballegård
Forsøg og marker med proteinafgrøder på Rugballegård
- Raps
- Lupiner
- Ærter
- Blandinger med korn og bælgsæd
- Quinoa
- Soja
- Kornsorter med højt proteinindhold
20.40-21.45: Temamøde om proteinafgrøder
Dyrkning af lupiner: Sortsvalg, sygdomme, samdyrkning med korn
Bjarne Jørnsgård, forsker på Den Kgl. Veterinær og Landbohøjskole
Blandingsafgrøder med korn og bælgsæd: Effekt på ukrudt, sygdomme, skadedyr og udbytte
Henrik Hauggaard-Nielsen, forsker på Den Kgl. Veterinær og Landbohøjskole
Sædskifter med bælgsæd og økonomi i dyrkning af ærter, lupin, hestebønner og raps
Michael Tersbøl, Landbrugets Rådgivningscenter, Landskontoret for Planteavl
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/102/1/Rugballe060802.pdf
Hauggaard-Nielsen, Henrik (2002) Blandingsafgrøder med korn og bølgsæd – erfaringer og nye udfordringer. Speech at: Thematic Field day at the Organic Research Farm Rugballegård - Protein crop production, Organic Research Farm Rugballegård, Danish Institute of Agricultural Sciences, 6 August 2002.
oai:orgprints.org:107
2021-11-12T07:46:55Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D35736F696C:31736F696C7175616C
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D626F6F6B
https://orgprints.org/id/eprint/107/
Catch crops and green manures as biological tools in nitrogen management in temperate zones
Thorup-Kristensen, Kristian
Magid, Jacob
Jensen, Lars Stoumann
Nutrient turnover
Soil quality
Production systems
The review deals with the effects of nitrogen catch crops or green manures on the N dynamics of agricultural systems. The mechanisms of their effects are discussed, and it is discussed how they can be used to achieve the agricultural and environmental goals of N management.
Elsevier
2003
Book
NonPeerReviewed
application/pdf
en
/id/eprint/107/4/107.pdf
Thorup-Kristensen, Kristian; Magid, Jacob and Jensen, Lars Stoumann (2003) Catch crops and green manures as biological tools in nitrogen management in temperate zones. Elsevier, .
oai:orgprints.org:112
2010-04-12T07:27:14Z
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/112/
Artsblandinger, udlægsår og eftervirkning
Hauggaard-Nielsen, Henrik
Cereals, pulses and oilseeds
Feltdage ved økologiske forsøgsarealer den 17. - 19. juni 2002
I regi af forskningsprogrammet FØJO II er der blevet mulighed for at tilbyde nogle kursusforløb, hvor de økologiske sædskiftearealer er i fokus. Den 17. – 19. juni 2002 udbydes det første forløb, som gennemføres ved Jyndevad Forsøgsstation i Sønderjylland – og programmet er nu klar.
De kommende år vil der blive tilbudt lignende forløb ved de øvrige sædskiftearealer, der ligger på andre jordtyper i Foulum, Årslev, Flakkebjerg og Holeby. Ved Feltdagene vil der blive lagt særligt vægt på at observere og diskutere plantevæksten i de forskellige forsøgsparceller og sædskifter. Desuden vil de hidtidige resultater og registreringer fra arealerne og de aktuelle forskningsprojekter fra Jyndevad og de øvrige sædskiftearealer, blive gennemgået.
Feltdagene henvender sig til alle, der rådgiver økologiske landmænd – både foreningsansatte og firmaansatte rådgivere.
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/112/1/jundevad190602.pdf
Hauggaard-Nielsen, Henrik (2002) Artsblandinger, udlægsår og eftervirkning. Speech at: Talk for organics agricultural advisors arranged by the Danish Agricultural Advisory Centre, Reserach Station Jyndevad, Danish Institute of Agricultural Sciences, 19 June 2002.
oai:orgprints.org:117
2010-04-12T07:27:15Z
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/117/
Blandsæd – bland afgrøderne og høst fordele
Hauggaard-Nielsen, Henrik
Crop combinations and interactions
Cereals, pulses and oilseeds
Internt møde for salgskonsulenter arrangeret af DLG-Økologi
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/117/1/DLG.pdf
Hauggaard-Nielsen, Henrik (2002) Blandsæd – bland afgrøderne og høst fordele. Speech at: Salg af økologiske produkter - DLG Økologi, FAF huset Odense, 16 January, 2002.
oai:orgprints.org:118
2010-04-12T07:27:15Z
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/118/
Dyrkning af blandingsafgrøder med bælgsæd
Hauggaard-Nielsen, Henrik
Crop combinations and interactions
Cereals, pulses and oilseeds
Der bliver stillet stadig større krav til den økologiske fodring. En større og større del af foderrationen skal være økologisk. Og reglerne sætter samtidig nye og mere restriktive grænser for brug af fiskemel, kødbenmel og sojaskrå.
Det betyder, at økologiske landmænd har brug for nye fodermidler med et højt og særlig værdifuldt indhold af proteiner. For danske planteavlere er det derfor en udfordring at kunne levere økologiske proteinafgrøder. Hvorfor importerer råvarerne til en dansk økologisk produktion, hvis vi selv kan dyrke dem herhjemme? Med de sager om fejl og snyd ved import af økologiske råvarer, der dukkede op i løbet af 2001, er spørgsmålet ekstra relevant.
Det er baggrunden for, at Brancheforeningen for økologisk planteavl i 2001 undersøgte mulighederne for at dyrke proteinafgrøder på økologiske planteavlsbrug. Med et tilskud fra Direktoratet for FødevareErhverv gennemførte vi demonstrationsprojektet Proteinafgrøder i økologisk jordbrug.
Som afslutning på projektet ’Proteinafgrøder i økologisk jordbrug’ holdt Brancheforening for økologisk planteavl en temadag.
2001
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/118/1/Snoh%C3%B8j3.pdf
Hauggaard-Nielsen, Henrik (2001) Dyrkning af blandingsafgrøder med bælgsæd. Speech at: Økologiske proteinafgrøder - dyrkning og fodring, Snoghøj IT-folkehøjskole, 28 November 2001.
oai:orgprints.org:122
2010-04-12T07:27:15Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/122/
Grain legumes in organic cropping systems
Hauggaard-Nielsen, Henrik
Crop combinations and interactions
Cereals, pulses and oilseeds
Grain legumes are valuable protein and energy sources in animal feeds and in human diets low in meat. Furthermore, grain legumes strongly benefit the cropping system, via biological fixation of atmospheric N2 - a fundamental process for maintaining soil fertility in organic farming systems. Other positive effects in the crop rotations are recycled N-rich crop residues and the break-crop effect in cereals-rich rotations. However, yield variability in grain legumes is well known and related to intolerance to water stress and harvest difficulties either because of lodging or late maturity. Grain legumes seeds also vary in quality, mainly due to environmental conditions and together with a weak competitive ability towards weeds and pathogen attack like e.g. Ascochyta spp. they may be less favoured in organic crop rotations.
There is a general need to increase grain legume protein production in Europe to meet an increasing demand. A certain import of conventionally produced protein feed sources is presently allowed on organic farms, e.g. soybean meal, free of genetically modified soybean grain, and oilseed rape cakes. However, from 2005 all feed used in animal production must be organically produced according to EU regulations. In that perspective evaluation of potentials for increased protein production via the growing of grain legumes in organic cropping systems is urgent.
AEP
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/122/1/LINK-WS-HHN.pdf
Hauggaard-Nielsen, Henrik (2002) Grain legumes in organic cropping systems. In: Clustered Workshops LINK Strasbourg, AEP.
oai:orgprints.org:124
2010-04-12T07:27:15Z
7374617475733D756E707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D7265706F7274
https://orgprints.org/id/eprint/124/
Vurdering af mulighederne for forebyggelse og alternativ bekæmpelse i frugt og bær
Lindhard, Senior scientist Hanne
Fruit and berries
Pesticidhandlingsplanen II af marts 2000 har fastsat en række mål og virkemidler til bestræbelse på at nedsætte belastningen af miljøet og sundheden, samt at fjerne overforbruget af pesticider. I handlingsplanen, som tager udgangspunkt i Bichel-udvalgets indstillinger og anbefalinger i rapporterne fra 1999, er der fastsat specifikke reduktionsmål for pesticidanvendelse på
landbrugsafgrøder. Det ønskes, at gartneri og frugtavl ligeledes inddrages i en fremtidig strategi for reduktionen af pesticider, men at der foretages en yderligere konsekvensvurdering før der fastsættes reduktionsmål. Bichel-udvalget gennemførte ikke omfattende konsekvensanalyser for hel eller delvis afvikling af
pesticidanvendelsen i gartneri og frugtavl på grund af utilstrækkeligt datamateriale.
I Bichelrapporten blev der på frugt- og bærområdet for første gang udarbejdet oversigter over pesticidforbruget og behandlingsindeks for enkelte kulturer. Forbruget blev undersøgt som et gennemsnit over 3 år 1994-1996. Siden har revurderingen af pesticider medført, at mange midler ikke længere er godkendt til brug i Danmark. Desuden er enkelte nye midler blevet godkendt. Derfor ser forbrugsmønsteret i perioden 1998 til 2000 formentlig anderledes ud end i den 3-års-periode, som blev undersøgt i forbindelse med Bichel-udredningen. Derfor blev i pesticidforbruget i 1997-2000 undersøgt som en del af udrednings arbejdet under Kirsten Jensen Udvalget i foråret 2001. Undersøgelsen omfatter 5 hovedkulturer inden for sektoren.
Der savnes konkret viden om hvilke alternative forebyggelses- og bekæmpelsesmetoder, der findes inden for de enkelte områder i gartneri og frugtavl, og hvor meget der kan opnås ved alternative metoder og strategier i forhold til anvendelsen af herbicider, fungicider, insekticider, vækstreguleringsmidler og andre hjælpestoffer. Hvor meget af den kemisk behandling kan f.eks. afløses af ikke kemiske alternativer og hvad bliver konsekvenserne af disse både mht. produktion og økonomi.
For at give læserne et overblik over frugt og ærpoduktionen i Danmark, starter rapporten med at give et statistisk overblik over produktionen.
1.1 Formålet med denne rapport
- At kortlægge pesticidforbruget i Frugt og bær.
- Skabe overblik over den eksisterende viden om pesticidbelastning og eksponering.
- At foretage et litteraturstudie, hvor muligheder for at reducere pesticidforbruget inden for frugt og bær gennemgås.
- At vurdere alternative metoders praktiske anvendelse og effekt på pesticidforbruget
2001-05
Report
NonPeerReviewed
application/pdf
en
/id/eprint/124/1/Vurdering_af_mulighederne_for_forebyggelse.pdf
Lindhard, Senior scientist Hanne (2001) Vurdering af mulighederne for forebyggelse og alternativ bekæmpelse i frugt og bær. Danish Institute of Agricultural Sciences , Department of Horticulture.
oai:orgprints.org:125
2010-04-12T07:27:15Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3474696C6C616765
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/125/
Kamdyrkning (drill) – et økologisk alternativ
Henriksen, C.B.
Rasmussen, J.
Nutrient turnover
Production systems
Soil tillage
I projektet CARMINA undersøges de potentielle fordele ved at anvende kamme som alternativ til pløjning. Det er tidligere vist at kamme kan reducere udvaskning af kvælstof, øge omsætningen af organisk stof og sikre en tidligere såning samt bedre etablering. I CARMINA kombineres kamme med dyrkning af fangafgrøder og inkorporering af husdyrgødning i en række nye forsøg.
Høgskolen i Hedmark
Cottis, T.
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/125/1/Kamdyrkning_fra_rapp_03_2002.pdf
Henriksen, C.B. and Rasmussen, J. (2002) Kamdyrkning (drill) – et økologisk alternativ. In: Cottis, T. (Ed.) Den nasjonale kongres for økologisk jordbrug, Rapport nr. 3 - 2002, Høgskolen i Hedmark, pp. 61-68.
oai:orgprints.org:127
2010-04-12T07:27:15Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:35766567657461626C6573
7375626A656374733D35736F696C:31736F696C7175616C:32736F696C62696F6C
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/127/
Catch Crops in Organic Farming Systems without Livestock Husbandry - Model Simulations
Müller, Dr. Torsten
Magid, Dr. Jakob
Jensen, Dr. Lars Stoumann
Nielsen, Dr. Niels Erik
Thorup-Kristensen, Dr. Kristian
Nutrient turnover
Production systems
Crop combinations and interactions
Vegetables
Soil biology
During the last years, an increasing number of stockless farms in Europe converted to organic farming practice without re-establishing a livestock. Due to the lack of animal manure as a nutrient input, the relocation and the external input of nutrients is limited in those organic cropping systems. The introduction of a one-year green manure fallow in a 4-year crop rotation, including clover-grass mixtures as a green manure crop is the classical strategy to solve at least some of the problems related to the missing livestock. The development of new crop rotations, including an extended use of catch crops and annual green manure (legumes) may be another possibility avoiding the economical loss during the fallow year.
Modelling of the C and N turnover in the soil-plant-atmosphere system using the soil-plant-atmosphere model DAISY is one of the tools used for the development of new organic crop rotations. In this paper, we will present simulations based on a field experiment with incorporation of different catch crops.
An important factor for the development of new crop rotations for stockless organic farming systems is the expected N mineralisation and immobilisation after incorporation of the plant materials. Therefore, special emphasise will be put on the simulation of N-mineralisation/-immobilisation and of soil microbial biomass N. Furthermore, particulate organic matter C and N as an indicator of remaining plant material under decomposition will be investigated.
International Union of Soil Science
Kheoruenromme, Dr. Irb
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/127/1/0830.pdf
Müller, Dr. Torsten; Magid, Dr. Jakob; Jensen, Dr. Lars Stoumann; Nielsen, Dr. Niels Erik and Thorup-Kristensen, Dr. Kristian (2002) Catch Crops in Organic Farming Systems without Livestock Husbandry - Model Simulations. In: Kheoruenromme, Dr. Irb (Ed.) Conference Transactions, International Union of Soil Science, 830.1-830.9.
oai:orgprints.org:132
2012-08-02T09:27:41Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/132/
Evaluation of 14 Old Unsprayed Apple Varieties
Kühn, Birka Falk
Pedersen, Hanne Lindhard
Fruit and berries
The performance of 14 old apple varieties planted in three experimental plots was evaluated over four or five seasons. The yield and fruit size were recorded on conventionally grown trees. The level of disease and pests on trees and fruits was estimated in an organically grown unsprayed plot, and the eating quality was evaluated in an unsprayed experimental plot. Large differences in yield and fruit size were found between varieties. It was demonstrated that Holsteiner Cox was the only variety that combined high yield, good fruit size and good eating quality with an acceptably low susceptibility to disease. Most varieties had poor eating quality. ‘Holsteiner Cox’ had a medium susceptibility to canker and powdery mildew, while susceptibility to apple scab varied between the years. The investigation showed that old varieties seemed to be as susceptible to disease as newer commercially grown varieties. Of the 14 varieties only Holsteiner Cox was of interest for organic growing.
2003-05
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/132/1/Evaluation_af_14_old_Unsprayed_Apple_Varieties.pdf
Kühn, Birka Falk and Pedersen, Hanne Lindhard (2003) Evaluation of 14 Old Unsprayed Apple Varieties. Biological Agriculture & Horticulture, 20 (4), pp. 301-310.
oai:orgprints.org:133
2012-08-10T11:11:07Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/133/
Covercrops in Blackcurrant (Ribes nigrum)
Pedersen, Hanne Lindhard
Fruit and berries
With the objective to identify the effect of soil cultivation and nitrogen supply in organic production of blackcurrant a field trial was planted autumn 1996 under unsprayed conditions. The bush rows were cleaned mechanically for weed, and cover crops were established in the alleyways.
During establishment all four cover crops gave a sufficient nitrogen supply. The level of nitrogen in soil and the growth were smallest in the annual sown cover crop. Miniritzotrons were used to follow blackcurrant root growth in total mechanical cleaned plots and plots with sown alleyways. The maximum root dept of blackcurrants of 125 cm were obtained direct under the bush in autumn 1998, whereas the roots only were present down to 40 cm 1.5 meters from the centre of the row. The variety ‘Titania’ had a deeper root pattern than ‘Ben Lomond’. There were no significant yield differences among the soil treatments. There was a tendency to a higher yield for ‘Titania’ in 2000 in the annual sown cover crop, probably due to the deeper root pattern of ‘Titania’ and thereby less susceptibility to mechanical root damage. ‘Titania’ had the highest yield in the two cropping years 1999 and 2000; whereas, ‘Ben Lomond’ had a very low yield due to severe infections of American gooseberry mildew (Sphaerotheca mors-uvae); which caused very little shoot growth. ‘Farleigh’ was susceptible to white pine blister rust (Cronartium ribicola) and infections of leaf spot (Gloeosporidiella ribis) occurred every year. ‘Titania’ and ‘Intercontinental’ had the best field resistance to diseases.
Acta Horticulturae
2002-12
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/133/1/Artikel_-_covercrops_in_blackcurrant.pdf
Pedersen, Hanne Lindhard (2002) Covercrops in Blackcurrant (Ribes nigrum). Acta Horticulturae, 585, pp. 633-638.
oai:orgprints.org:134
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7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/134/
Organic fruit production in Denmark
Lindhard, Senior scentist Hanne
Korsgaard, Mrs Maren
Fruit and berries
Organic agriculture covers app. 6% of the Danish agricultural land. There are app. 200 fruit- and berry growers, totally they grow app. 350 ha, which are 5 percent of the total Danish area grown with fruit and berries. Converting to organic agriculture are national subsidised. At the moment the yearly subsidy is 291 GBP to 49 GBP pr. ha depending on the type of farm.
Pear and especially apple production are huge challenges to the Danish growers, as the humid climate favours apple scab and other diseases. It has not been a profitable production up till now. To control scab infections some growers use sulphur. In Denmark it has been forbidden to use copper since 1995. Organic strawberry production is profitable in Denmark. The main variety is ‘Honeoye’, which is quite resistant to diseases.
If total conversion of the Danish fruit and berry productions happened in 1998 the apple yield would have decreased with 86 percent. Black currant and pear yield would be reduced with more than 50 percent. Strawberries would keep the highest yield compared to conventional production.
There are many ongoing organic trails in apples, some in black currants and a few in prunus and strawberries.
2000
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/134/1/ORGANIC_FRUIT_PRODUCTION_IN_DENMARK.pdf
Lindhard, Senior scentist Hanne and Korsgaard, Mrs Maren (2000) Organic fruit production in Denmark. In: Organic fruit production in Denmark.
oai:orgprints.org:135
2010-04-12T07:27:15Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/135/
Æbler uden kemi
Pedersen, Senior scientist Hanne Lindhard
Fruit and berries
Æbler er en højværdiafgrøde, hvor vi i Danmark producerer omkring 25 procent af vores eget forbrug. Produktet går fra træet og til forbrugeres uden forædling af varen. Derfor er det vigtigt at de høstede frugter har en tilfredsstillende kvalitet uden for mange pletter eller andre skader.
Der findes mange sygdomme og skadedyr, som angriber frugterne, men svampesygdommene æbleskurv og gloeosporium er dem, som volder avlerne de største problemer i produktionen. Begge sygdomme giver pletter på frugten.
2000
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/135/2/Aebler_uden_kemi.pdf
Pedersen, Senior scientist Hanne Lindhard (2000) Æbler uden kemi. Danmarks JordbrugsForskning, Årsberetning, 2000.
oai:orgprints.org:136
2010-04-12T07:27:15Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/136/
Understanding the role of grain legumes in the N cycling of agroecosystems
Jensen, Erik Steen
Hauggaard-Nielsen, Henrik
Nutrient turnover
Cereals, pulses and oilseeds
Grain legumes have three major functions in cropping systems: 1) to produce feed and food protein, 2) to contribute N to the cropping system via symbiotic N2 fixation, and 3) to serve as a break-crop in cereal-rich rotations. Depending on specific farming system principles these functions have different priorities. Some conventional systems may focus on protein production whereas organic farming systems try to integrate them all.
Symbiotic N2 fixation (SNF) is a unique biological process influenced by several environmental factors; optimising SNF is not an easy task. Integrated management of crop rotation should be considered to combine and exploit better the specific characteristics of each crop (self-sufficient or not in N, different C/N ratio, more or less rapid residue mineralisation, etc.).
AEP
2002
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/136/1/GL36.pdf
Jensen, Erik Steen and Hauggaard-Nielsen, Henrik (2002) Understanding the role of grain legumes in the N cycling of agroecosystems. Grain Legumes, 2002, 36 (2), pp. 12-14.
oai:orgprints.org:137
2010-04-12T07:27:15Z
7374617475733D707562
7375626A656374733D34706C616E74:37706C616E746272656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/137/
Managing crop nitrogen and soil dynamics
Salon, Christoph
Hauggaard-Nielsen, Henrik
Breeding, genetics and propagation
Cereals, pulses and oilseeds
Despite extensive research grain legume seed protein content and yield remains low and unstable.
Grain legume performances in the cropping system are highly dependent upon N nutrition of the crop relying on root assimilation of soil N in combination with symbiotic fixation of atmospheric dinitrogen. In order to improve the competitive ability of grain legumes for growth resources an enlargement of the crop surface area production in combination with a judicious management of both inputs and N acquisition (and allocation to the harvested organs) is needed. Competitive ability implies to take into account economical constraints and the crop production effect on the environment, reducing the amount of N remaining after the crop harvest preventing N leaching.
The aims of the workshop were to explore possible research activities to enhance grain legume seed filling in relation to management of crop and soil N dynamics. About 30 conference participant were present and the workshop was strengthened by several poster presentations.
AEP
2001
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/137/1/GL34.pdf
Salon, Christoph and Hauggaard-Nielsen, Henrik (2001) Managing crop nitrogen and soil dynamics. Grain legumes, 2001, 34 (4), pp. 18-19.
oai:orgprints.org:152
2010-04-12T07:27:16Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/152/
Gødskning med kvælstof i solbær.
Lindhard, Senior seintist Hanne
Fruit and berries
Solbær er en frugtkultur, som behøver forholdsvis meget kvælstof. Hvis kvælstof gives over hele arealet bliver det anbefalet at give omkring 100 kg N per ha.
Solbærs optagelse af kvælstof er stor tidligt på vækstsæsonen. Derfor er kvælstoftilførsel vigtigt i maj og juni.
Men behøver solbær yderligere kvælstof senere på sæsonen for at sikre vækst, samt blomster og frugtudvikling? Det følgende karforsøg blev designet til at besvare dette spørgsmål.
2001-04
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/152/1/Artikel_-_G%C3%B8dskning_med_kv%C3%A6lstof_i_solb%C3%A6r.pdf
Lindhard, Senior seintist Hanne (2001) Gødskning med kvælstof i solbær. Frugt og Bær, April 2001, pp. 94-95.
oai:orgprints.org:163
2010-04-12T07:27:16Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/163/
Solbær, aktuelt nyt fra Skotland og England.
Lindhard, Senior sientist Hanne
Fruit and berries
Erfaringer og informationer fra en tre dages tur til Scottish Crop Research Institute, juli 1999.
Rejsen var sponsoret af Brd. Hansens mindelegat. Administreret af Dansk Erhvervsfrugtavl.
2000
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/163/2/Artikel_-_solb%C3%A6r_aktuelt_nyt_fra_skotland_og_england.pdf
Lindhard, Senior sientist Hanne (2000) Solbær, aktuelt nyt fra Skotland og England. Frugt og Bær, 2000, p. 115.
oai:orgprints.org:164
2010-04-12T07:27:16Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/164/
Dækkulturer i økologisk solbærdyrkning
Lindhard, Senior Scientist Hanne
Fruit and berries
De store udfordringer i en økologisk solbærproduktion er at finde sunde sorter, som er modstandsdygtige overfor sygdomme, samt at få styr på ukrudtsbekæmpelsen og gødskningen.
Forskningscenter for økologisk Jordbrug (FØJO) er et forskningscenter uden mure. Under forskningscentret foregår der blandt andet forsøg med optimering af økologisk dyrkning af solbær. Forsøgene foregår i praksis i Årslev på forskergruppe for frugt og bær.
2001
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/164/1/Artikel_-_%C3%98kologisk_solb%C3%A6rdyrkning.pdf
Lindhard, Senior Scientist Hanne (2001) Dækkulturer i økologisk solbærdyrkning. Frugt og Bær, 2001, pp. 162-164.
oai:orgprints.org:165
2010-04-12T07:27:16Z
7374617475733D696E7072657373
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D7265706F7274
https://orgprints.org/id/eprint/165/
Vurdering af økologisk produktion i gartneri og frugtavl
Daugaard, Senior scientist Holger
Fruit and berries
Projektrapporten giver en beskrivelse af den nuværende danske økologiske produktion af gartneriprodukter. Situationen er meget forskelligartet for de mange kulturer, som dyrkes inden for gartneri og frugtavl i Danmark. Rapporten er derfor inddelt i henholdsvis frugt og bær, frilandsgrønsager, væksthusproduktion og planteskoleproduktion.
Inden for frugt- og bærproduktionen dyrkes ca. 3% af erhvervsarealet økologisk. I rapporten er fokuseret på æbler, pærer, surkirsebær, solbær og jordbær. Især inden for solbær og jordbær er økologisk produktion i dag mulig, ikke mindst med fremkomsten af egnede sorter og udviklingen af ny dyrkningsteknik. Inden for æbler er vanskelighederne fortsat store, idet det p.g.a. stort investeringsbehov og lave udbytter er meget vanskeligt at opretholde en rentabel produktion. Inden for pære og surkirsebær er der i dag praktisk taget ingen økologisk produktion, primært p.g.a. manglende forebyggelses- og bekæmpelsesmuligheder for ødelæggende svampesygdomme.
Inden for frilandsgrønsager dyrkes ca. 10% af erhvervsarealet økologisk, men der er store forskelle mellem kulturerne. For gulerødder ligger andelen på omkring 30%, mens den kun er ca. 2% for blomkål og broccoli. I rapporten er fokuseret på løg, hovedkål, gulerod, salat, porre, blomkål og konservesærter, og situationen er meget forskellig alt efter den enkelte kultur. For hovedkål og gulerod er økologisk produktion realistisk og udgør en betydende del af den danske produktion, mens vanskelighederne er noget større inden for f.eks. blomkål/broccoli.
Væksthusproduktionen er langt den største gartneriproduktion i Danmark. Antallet af kulturer er meget stort, med varierende krav og muligheder. I rapporten udvalgt nogle modelkulturer, hvis forhold tilsammen kan repræsentere perspektiver og vanskeligheder i relation til økologisk produktion. Følgende områder med en mindre økologisk produktion er beskrevet: væksthusgrønsager (modelkulturer agurk, tomat, salat), krydderurter og ikke-blomstrende potteplanter (modelkultur Hedera helix). For langt den største del af væksthusproduktionen findes der imidlertid i dag ingen økologisk produktion, og følgende områder er her beskrevet: Blomstrende potteplanter (modelkultur Kalanchoë og Jasminum), afskårne blomster (modelkultur tulipan), småplanter til videre produktion (modelkultur Eustoma) og stauder på friland (mange arter). For hver modelkultur er foretaget en generel gennemgang af kulturforløbet samt en beskrivelse af vanskelighederne ved en eventuel økologisk produktion.
Inden for planteskoleproduktionen er kun ca. 1% økologisk omlagt. Som for væksthusproduktionen er antallet af kulturer meget stort, med varierende krav og muligheder, hvilket i sig selv er en udfordring i relation til økologisk drift. I rapporten identificeres følgende kulturgrupper: frugttræer, frugtbuske, roser, slyngplanter, prydtræer, prydbuske, og allétræer. Rapporten giver en generel gennemgang af dyrknings- så vel som afsætningsmæssige vanskeligheder ved en eventuel økologisk produktion.
2002
Report
NonPeerReviewed
application/pdf
en
/id/eprint/165/1/Vurdering_af_%C3%B8kologisk_produktion_i_gartneri_og_frugtavl.pdf
Daugaard, Senior scientist Holger (2002) Vurdering af økologisk produktion i gartneri og frugtavl. .
oai:orgprints.org:167
2010-04-12T07:27:17Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D35736F696C:31736F696C7175616C
7375626A656374733D35736F696C:31736F696C7175616C:32736F696C62696F6C
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/167/
Estimating legume N2 fixation in a grass-clover mixture of grazed organic cropping systems using two 15N methods.
Vinther, Finn P.
Jensen, Erik S.
Nutrient turnover
Soil quality
Soil biology
Pasture and forage crops
The input of N through symbiotic N2 fixation (SNF) in grass-clover mixtures was determined in an organic cropping system for grazing during three years. The mixture of perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.) was established by undersowing in spring barley (Hordeum vulgare L.) and maintained subsequently for two production years. Dinitrogen fixation was determined using the 15N isotope dilution techniques and two labelling procedures. Using either pre-labelling of the soil with immobilisation of the 15N by addition of a carbon source before establishment of the grass-clover mixture or adding the 15N labelled ammonium to the established crop, resulted in similar estimates of the proportion of N derived from the atmosphere (pNdfa). However, the average coefficient of variance of the pNdfa values were significantly lower with the pre-labelling immobilisation method. The proportion of fixed N in the clover varied between 0.70 and 0.99 with the lowest values in the beginning and at the end of the growing season. The total amount of N fixed in the above-ground plant parts of the grass-clover mixture varied between 10.0 and 23.5 g N m-2 yr-1. The total input from N2 fixation in the rotation was between 30 and 50 g N m-2 yr-1 (above-ground plant parts only). This variation could be ascribed to differences in climatic conditions during the three years. The amount of N in grass-clover residues incorporated in the soil after the second production year ranged between 19.6 and 29.6 g N m-2, of which 52-66% was estimated to be derived from fixation. The amount of atmospherically derived N actually entering the soil in the grazed cropping system is discussed.
2000
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/167/2/vinther_and_Jensen_2000.pdf
Vinther, Finn P. and Jensen, Erik S. (2000) Estimating legume N2 fixation in a grass-clover mixture of grazed organic cropping systems using two 15N methods. Agriculture, Ecosystems & Environment, 78, pp. 139-147.
oai:orgprints.org:170
2010-04-12T07:27:17Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/170/
Vælg den rigtige type feromonfælde til viklere
Jørgensen, Mrs. Gitte Hallengreen
Pedersen, Senior scientist Hanne Lindhard
Fruit and berries
Viklere er en alvorlig skadevolder i danske æbleplantager. Optimal bekæmpelse kræver kendskab til flyvetidspunktet. Dette tidspunkt kan findes ved at bruge feromonfælder. Ved bestilling af feromonfælder til viklere, er det i Danmark kun muligt at få kombinationsfælder, dvs. fælder, som kan tiltrække flere arter af viklere (fælder til æblevikleren kan dog købes som enkeltfælde). En undersøgelse udført i 1999 belyser effektiviteten af kombinationsfælder. Kombinationsfælderne fanger ikke så mange viklere som enkelt fælder.
Frugt og Grønt
2001-04
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/170/1/Vaelg_den_rigtige_type_feromonfaelde_til_viklere.pdf
Jørgensen, Mrs. Gitte Hallengreen and Pedersen, Senior scientist Hanne Lindhard (2001) Vælg den rigtige type feromonfælde til viklere. Frugt og Bær, April 2001 (4), pp. 88-90.
oai:orgprints.org:171
2010-04-12T07:27:17Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D7265706F7274
https://orgprints.org/id/eprint/171/
Plant et frugttræ
Lindhard, Senior scientist Hanne
Fruit and berries
Denne Grøn Viden beskriver vigtige forhold omkring valg, plantning og etablering af frugttræer i haven. Initiativet og redigeringen af teksten er fortaget af Privathavebrugets Frugt og Bærudvalg, som er sammensat af konsulenter fra Det Danske Haveselskab, kolonihaveforbundet for Danmark og repræsentanter fra Planteopformeringsstationen, Den Kgl. Veterinær- og Landbohøjskole, samt Danmarks JordbrugsForskning.
Plantning af frugttræer giver store glæder. Frugten kan bruges i husholdningen og som foder til fugle og andre dyr. Selve træet er dekorativt hele året. Blomstringen i foråret, hvor mange træer er helt dækket af blomster, om sommeren hvor udviklingen af årets høst følges, efteråret hvor frugten nydes og endelig vinteren hvor tiloversblevne æbler hænger dekorativt på de bare grene og hvor træets smukke opbygning tydeligt ses.
2001-09
Report
NonPeerReviewed
application/pdf
en
/id/eprint/171/1/Groen_viden_Havebrug_Plant_et_frugttrae.pdf
Lindhard, Senior scientist Hanne (2001) Plant et frugttræ. Grøn Viden, Havebrug, no. 142. Danmarks JordbrugsForskning , Afdeling for Prydplanter og Vegetabilske Fødevarer.
oai:orgprints.org:172
2010-04-12T07:27:17Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D35736F696C:31736F696C7175616C
7375626A656374733D35736F696C:31736F696C7175616C:32736F696C62696F6C
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/172/
Spatial variability of symbiotic N2 fixation in grass-white clover pastures estimated by the 15N isotope dilution method and the natural 15N abundance method
Hansen, Jacob P.
Vinther, Finn P.
Nutrient turnover
Soil quality
Soil biology
Pasture and forage crops
Aiming at estimating the spatial variability in N2 fixation, and to evaluate the appropriateness of the 15N isotope dilution (ID) method and the natural 15N abundance (NA) method in reflecting spatial variability under the influence of cattle grazing, the symbiotic N2 fixation in grass-white clover mixture was studied. At the Foulum site, where the ID method was used, differences in the climatic conditions between the two years of investigations caused a considerable difference in plant growth rates and proportion of clover. Consequently, the total N2 fixation in ungrazed reference plots was significantly less in 1998 than in 1997, being 5.9 and 12.5 g N m-2, respectively. In both years there was a wide range in concentration of inorganic N in the soil with coefficients of variance of approximately 60 – 190% for ammonium and 70 – 340% for nitrate. Significant negative correlations between pNdfa, determined by the ID method, and the log-transformed values of inorganic N and total N in grass were found. The NA method was applied on 3 nearby commercial dairy farms. They also showed high coefficients of variation. The coefficient of variance for NO3--N ranged from 37% to 282% and for NH4+-N from 29% to 237%. Average estimates of pNdfa values, which in the NA method were calculated using apparent B values ranging from –2.10 to –2.59‰, were generally lower (0.7 – 0.87) for these farms than for the Foulum site (0.89 – 0.95) using the ID method. For the NA method the d15N values, i.e. deviation in 15N concentration from atmospheric N2, ranged from -7.0 to 5.7‰ for the grass N, which in several cases was lower than for clover N. Due to this high variability of the d15N values, probably caused by deposition and plant assimilation of 15N depleted urinary N in the pastures, the NA method was marginal for accurate determination of pNdfa. Consequently no significant correlation between the pNdfa determined by this method, and the log-transformed values of inorganic N in soil or total N in grass were found.
2001
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/172/1/Hansen_og_Vinther_2001.pdf
Hansen, Jacob P. and Vinther, Finn P. (2001) Spatial variability of symbiotic N2 fixation in grass-white clover pastures estimated by the 15N isotope dilution method and the natural 15N abundance method. Plant and Soil (230), pp. 257-266.
oai:orgprints.org:173
2010-04-12T07:27:17Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/173/
Genvejen bruges i kampen mod æbleskurv
Lindhard, senior scientist Hanne
Bengtsson, Scientist Marianne
Fruit and berries
I August 1999 blev den 5. Workshop for forskere om integreret bekæmpelse af sygdomme i kernefrugt for forskere afholdt i Frankrig.
70 personer fra 21 lande deltog i workshoppen, heraf var 12 Europæiske lande repræsenteret.
Der var i alt 50 præsentationer, heraf var det som altid, æbleskurv, der var det store fælles emne. Æbleskurv er klart den alvorligste verdensomspændende svampesygdom i æbler.
2000-11
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/173/1/International_IP_workshop_1999_Frankrig.pdf
Lindhard, senior scientist Hanne and Bengtsson, Scientist Marianne (2000) Genvejen bruges i kampen mod æbleskurv. Frugt og Bær, November 2000, pp. 274-275.
oai:orgprints.org:174
2010-04-12T07:27:17Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/174/
Perspektiver for skurvresistente æble sorter
Kühn, Scientist Birka Falk
Fruit and berries
Æbleproduktion vil i fremtiden være kendetegnet ved anvendelse af så få pesticider som overhovedet muligt. Den mest effektive måde, til at få reduceret pesticidforbruget på, er ved at anvende sygdomsresistente sorter.
Skurvsvampen (Venturia inaquealis) er i dag en af de værste skadevoldere i æble dyrkningen. Sprøjtninger mod skurv udgør således en væsentlig andel af pesticidforbruget i æbleplantager. I første omgang ses symptomer som sorte pletter på blade og frugt, og ved svære angreb går frugtudbyttet væsentligt ned.
2001
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/174/1/Perspektiver_for_skurvresistente_%C3%A6ble_sorter.pdf
Kühn, Scientist Birka Falk (2001) Perspektiver for skurvresistente æble sorter. Gartner Tidende, 2001, pp. 12-13.
oai:orgprints.org:175
2010-04-12T07:27:18Z
7374617475733D756E707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6F74686572
https://orgprints.org/id/eprint/175/
Questionnaire on organic fruit and berry production in Europe
Lindhard, Hanne
Callesen, Ole
Fruit and berries
On the EUFRIN meeting in Girona, Spain, November 1998 it was decided that one of the specific tasks for the meeting in Laimburg should be preparing a questionnaire for organic fruit production in Europe. In August 1999 we send out a questionnaire for all the EUFRIN participants. All 14 members have answered the questions.
1999
Other
NonPeerReviewed
application/pdf
en
/id/eprint/175/1/Questionnaire_on_organic_fruit_and_berry.pdf
Lindhard, Hanne and Callesen, Ole (1999) Questionnaire on organic fruit and berry production in Europe. Danish Institute of Agricultural Sciences , Department of Horticulture. [Unpublished]
oai:orgprints.org:176
2010-04-12T07:27:18Z
7374617475733D756E707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D7265706F7274
https://orgprints.org/id/eprint/176/
Rapport om skudafmodning i æble
Lindhard, Senior Scientist Hanne
Callesen, Senior Scientist Ole
Fruit and berries
Skudafmodning og endeknopdannelse i æbler afhænger af sorten og af grundstammen. Der er i Forskergruppe for frugt og bær indsamlet skudafmodningsdata i perioden 1986-2001.
Oprindeligt blev arbejdet sat i gang for at undersøge om skudafmodningstidspunktet relaterede til grundstammens vinterhårførhed.
I forbindelse med økologisk dyrkning har disse skudafmodnings data også aktualitet, men af en anden årsag.
Æbleskurv angriber hele sæsonen så længe der er modtageligt løv. Ældre blade og skud er vanskelige eller helt umuligt for patogenet at inficere. Et væsentlig skurvsmittepotentiale om foråret er overvintrende skurv på grene og knopskæl. Smittekilden i træet kan ikke reduceres ved hjælp af øget omsætning af bladmasse. Den overvintrende bladmasse anses som det væsenligste smittepotentiale.
Æbleskurv som overvintre i vedet er meget tæt på det nye løv og frugter og har derfor en kort smittevej til modtaelig blade og frugter om foråret. Derfor er det vigtigt at reducere mulighederne for at skurven overvintrer i grene og knopskel.
Ved tidlig skudafmodning og løvfald ville potentialet for udvikling af æbleskurv i en æbleplantager om efteråret reduceres. Når væksten stopper tidligt vil de potentielle infektions steder for svampen reduceres. Derved bliver skudafmodningstidspunktet også relevant for økologisk produktion.
Hvis man ud fra viden om skudafmodning af grundstammer og sorter kan anbefale de tidligst afmodende til økologisk produktion ville risikoen for overvintrende æbleskurv og dermed smittetrykktet i plantagen det næste forår reduceres.
2002
Report
NonPeerReviewed
application/pdf
en
/id/eprint/176/1/Rapport_om_skudafmodning_i_%C3%A6ble.pdf
Lindhard, Senior Scientist Hanne and Callesen, Senior Scientist Ole (2002) Rapport om skudafmodning i æble. Danish Institute of Agricultural Sciences , Department of Horticulture.
oai:orgprints.org:179
2010-04-12T07:27:18Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/179/
Sådan smager de skurvresistente æblesorter
Kühn, Scientist Birka Falk
Thybo, Senior Scientist Anette
Fruit and berries
I 1999 blev der udført smagsbedømmelse af 21 skurvresistente æblesorter. Smagsbedømmelsen blev udført som en objektiv sensorisk test, hvor æblerne blev vurderet for 13 egenskaber. De vigtigste egenskaber til at beskrive sorterne var: Fasthed, sprødhed, melethed, æblesmag, sødhed, umoden smag og skind sejhed.
2000
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/179/1/179.pdf
Kühn, Scientist Birka Falk and Thybo, Senior Scientist Anette (2000) Sådan smager de skurvresistente æblesorter. Frugt og Bær, 2000, pp. 242-243.
oai:orgprints.org:180
2022-01-28T10:58:25Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D35736F696C:31736F696C7175616C
7375626A656374733D35736F696C:31736F696C7175616C:32736F696C62696F6C
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/180/
Symbiotic nitrogen fixation and N-transfer in a
grass-white clover mixture
Vinther, Finn P.
Nutrient turnover
Soil quality
Soil biology
Pasture and forage crops
Symbiotic N2 fixation (SNF) and transfer of fixed N from clover to grass in a grass-white clover mixture was measured during two years using 15N isotope dilution techniques. White clover derived from 87 to 99% of its N from the atmosphere. The total SNF ranged from 150 to 277 kg N ha-1 yr-1, which corresponded to 34-45 mg N fixed per gram of white clover dry weight. The transfer of fixed N from clover to grass corresponded to approximately 10 kg N ha-1 yr-1.
2000
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/180/1/N-fix_poster_Aalborg_2000.pdf
Vinther, Finn P. (2000) Symbiotic nitrogen fixation and N-transfer in a grass-white clover mixture. In: Grassland Science in Europe, 5, pp. 415-417.
oai:orgprints.org:181
2010-04-12T07:27:18Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/181/
Nye æbler på vej
Lindhard, Senior scientist Hanne
Fruit and berries
På de økologiske værksteds arealer for Frugt og Bær står æblehøsten for døren.
2002
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/181/1/%C3%86blerne_st%C3%A5r_for_d%C3%B8ren.pdf
Lindhard, Senior scientist Hanne (2002) Nye æbler på vej. Økologisk Jordbrug, 2002, p. 6.
oai:orgprints.org:182
2010-04-12T07:27:18Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/182/
Dækkulturer og skurvresistente æblesorter
Lindhard, Senior scientist Hanne
Fruit and berries
Økologiske produktion af æbler er vanskeligt. Tabsstørrelserne ved en usprøjtet æbleproduktion er vurderet til at være mere en 86 procent af høstudbyttet sammenlignet med konventionel produktion (Lindhard et al 1998). Forudsætningerne bag dette store tab er at behandlingen med pesticider stopper fra dagsdato med det nuværende traditionelle sortiment og med de nuværende kvalitetskrav til frugten. Dette viser størrelsen af udfordringen ved at etablere en produktion af æbler uden brug af kemi.
De største udfordringer i en økologisk æbleproduktion er at vælge de sorter, som er mest modstandsdygtige overfor sygdomme og skadedyr, samt at få foretaget en hensigtsmæssig jordbehandling. For at komme med et bidrag til løsningen af disse problemer, blev der på Forskningscenter Årslev i 1994 plantet et forsøg, hvor de på daværende tidspunkt 10 mest lovende skurvresistente sorter blev udvalgt, opformeret og kombineret med 3 dækkulturer. Forsøget er blevet holdt usprøjtet.
2000-08
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/182/1/oekologisk_aebledyrkning.pdf
Lindhard, Senior scientist Hanne (2000) Dækkulturer og skurvresistente æblesorter. Forskningsnytt om økologisk landbruk i Norden, August 2000, pp. 13-16.
oai:orgprints.org:183
2010-04-12T07:27:18Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:376672756974
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/183/
Økologisk frugt og bær: Et langt, sejt træk
Lindhard, Hanne
Fruit and berries
Frugter og bær går for det meste direkte fra jord til bord. Lige fra træet eller busken og ind i munden. Forbrugerne stiller derfor store krav om en produktion, der er forsvarlig – både sundhedsmæssigt og miljømæssigt.
Frugt og bær er imidlertid blandt de afgrøder, hvor der traditionelt bruges flest bekæmpelsesmidler. Eksempelvis er det i traditionel æbledyrkning ikke ualmindeligt med en behandlingshyppighed på 25. Langt de fleste behandlinger er med svampemidler, hvorimod behandlingen med insekt- og ukrudts-midler er mere beskedent med 1-3 behandlinger om året.
2000-08
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/183/1/oekologisk_frugt_og_baer_Et_langt_sejt_traek.pdf
Lindhard, Hanne (2000) Økologisk frugt og bær: Et langt, sejt træk. Forskningsnytt om økologisk landbruk i Norden, August 2000, pp. 1-2.
oai:orgprints.org:212
2010-04-12T07:27:19Z
7374617475733D707562
7375626A656374733D34706C616E74:37706C616E746272656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D746865736973
https://orgprints.org/id/eprint/212/
Betydningen af vækstregulering, bestøvning og skadedyrsangreb (hvidkløversnudebillen Apion Flavipes) for udbytterne i økologisk hvidkløverfrøavl
Grossmann, Cand. agro. Freya
Breeding, genetics and propagation
Pasture and forage crops
Grundet et nyt EU-direktiv skal alle økologiske landmænd i EU fra 2001 udelukkende anvende økologisk fremavlede frø.
Da Danmark er førende på området, og hvidkløver er den vigtigste afgrøde på de økologiske gårde, er der behov for at øge dyrkningen.
Der er imidlertid en række dyrkningsmæssige faktorer, der tilsammen er årsag til meget lave udbytter i de økologiske frømarker.
Denne opgave omhandler disse faktorer, med særlig vægt på at undersøge vækstregulering, bestøvning og angreb af hvidkløversnudebillens larvers betydning for frøudbyttet.
Faktorerne er analyseret ved litteraturstudie, og desuden blev der udtaget hvidkløverhoveder fra et parcelforsøg opstillet ved SJF-Flakkebjerg.
På baggrund af de hovedanalyser der blev foretaget, blev der konstateret:
· En sammenhæng mellem antallet af snudebillelarver i hovederne og antallet af beskadigede bælge.
· At såvel dårlig bestøvning som angreb af snudebillelarverne var årsag til reduceret udbytte.
I parcelforsøget blev det konstateret at 10-15% af bælgene i gennemsnit var ubestøvede, i de parceller der havde naturlig bestøvning. I disse to behandlinger blev der fundet 50% beskadigede bælge som følge af larvegnav i den usprøjtede behandling, mens andelen i den sprøjtede behandling var 1/3.
På baggrund af litteraturstudiet blev flg. andre faktorer konstateret at have indflydelse på frøudbyttet:
· Vækstregulering til fordel for reproduktiv vækst.
· Problemer med mekanisk ukrudtsbekæmpelse
· Frøtab som følge af dårligt egnet udstyr til opsamling og tærskning af skår
· Vejrforhold, som kan medføre dårlig bestøvning og dårlig tørring af skåret
· Mangelfuld bestøvning. Hvidkløver sætter ikke frø uden bestøvning.
DJVB
1999-12
Thesis
NonPeerReviewed
source
en
/id/eprint/212/1/bachelor.doc
Grossmann, Cand. agro. Freya (1999) Betydningen af vækstregulering, bestøvning og skadedyrsangreb (hvidkløversnudebillen Apion Flavipes) for udbytterne i økologisk hvidkløverfrøavl. Thesis, KVL , Sektion for Økologisk Jordbrug. DJVB.
oai:orgprints.org:215
2020-04-27T12:50:40Z
oai:orgprints.org:216
2020-04-27T15:01:22Z
7374617475733D707562
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/216/
Sowing time, false seedbed, row distance and mechanical weed control in organic winter wheat.
Rasmussen, Ilse A.
Weed management
Crop husbandry
Cereals, pulses and oilseeds
In organic farming, mechanical weed control in winter wheat is often difficult to carry out in the fall, and may damage the crop, and weed harrowing in the spring is not effective against erect, tap-rooted weeds such as Tripleurospermum inodorum, Papaver rhoeas, Brassica napus and others which have been established in the autumn. Some experiments concerning sowing strategy and intensity of mechanical weed control, which included row distance, were conducted. The results underline the importance of choosing weed control strategy, including preventive measures, according to the weed flora in the field. In the experiment with low weed pressure and without erect weeds, there was very little effect of sowing strategy and row distance. In such a case, the winter wheat might as well be sown early, in order to avoid possible yield loss by later sowing, and at normal row distance to enhance the competitiveness of the crop. In the experiments with high weed pressure and erect weeds, the weed control was better with late sowing and large row distance (high intensity control), even though this was not always reflected in the yield. However, the trade-off for lower input to the soil seed bank in organic systems should be enough to balance off the risk of smaller yield.
Cloutier, Daniel
2000-02
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/216/1/Elspeet.pdf
application/pdf
en
/id/eprint/216/2/Elspeet2000_iar.PDF
application/pdf
en
/id/eprint/216/3/EWRS_Elspeet_2000_iar2.PDF
Rasmussen, Ilse A. (2000) Sowing time, false seedbed, row distance and mechanical weed control in organic winter wheat. In: Cloutier, Daniel (Ed.) Abstracts 4th EWRS Workshop on Physical Weed Control, pp. 5-7.
oai:orgprints.org:217
2010-04-12T07:27:19Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:38706C616E746865616C7468
7375626A656374733D34706C616E74
74797065733D7265706F7274
https://orgprints.org/id/eprint/217/
Plantebeskyttelse i økologisk jordbrug - rapport fra en workshop
Production systems
Weed management
Crop health, quality, protection
Crop husbandry
Rapporten består af indlæg ved en workshop samt referater fra arbejdsgrupper og plenum. Indlæggene handler om igangværende forskning i plantebeskyttelse, plantebeskyttelsesproblemer på eksisterende økologiske landbrug og forudsætningerne for planteproduktion på forskellige bedriftstyper. Rapportens første afsnit giver en opsummering og konklusion på workshoppen.
Rasmussen, Ilse A.
1999
Report
NonPeerReviewed
application/pdf
en
/id/eprint/217/1/Rap_04.pdf
application/pdf
en
/id/eprint/217/2/oekoplantebesk.pdf
Rasmussen, Ilse A. (Ed.) (1999) Plantebeskyttelse i økologisk jordbrug - rapport fra en workshop. FØJO-rapport, no. 4. Forskningscenter for Økologisk Jordbrug .
oai:orgprints.org:220
2022-06-06T15:58:27Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/220/
Nyt fra de økologiske sædskifteforsøg - effekten af økologisk sædskifte begynder at vise sig
Rasmussen, Ilse A.
Production systems
Crop combinations and interactions
Weed management
Crop husbandry
Cereals, pulses and oilseeds
Økologiske sædskifteforsøg - sædskifteeffekter
Økologisk Landsforening
2002-09
Newspaper or magazine article
NonPeerReviewed
source
en
/id/eprint/220/1/OJ02_271_6.doc
Rasmussen, Ilse A. (2002) Nyt fra de økologiske sædskifteforsøg - effekten af økologisk sædskifte begynder at vise sig. Økologisk Jordbrug, September 2002, 22 (271), p. 6.
oai:orgprints.org:236
2022-06-06T15:58:27Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/236/
Nyt fra de økologiske sædskifteforsøg - Kløvergræsset i Jyndevad har været et smertensbarn
Rasmussen, Ilse A.
Crop combinations and interactions
Weed management
Cereals, pulses and oilseeds
Økologiske sædskifteforsøg - kløvergræs
Økologisk Landsforening
2002-05
Newspaper or magazine article
NonPeerReviewed
source
en
/id/eprint/236/1/OJ02_264_6.doc
Rasmussen, Ilse A. (2002) Nyt fra de økologiske sædskifteforsøg - Kløvergræsset i Jyndevad har været et smertensbarn. Økologisk Jordbrug, May 2002, 22 (264), p. 6.
oai:orgprints.org:237
2022-06-06T15:58:27Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/237/
Nyt fra de økologiske sædskifteforsøg - alle forsøgsparceller er høstet
Rasmussen, Ilse A.
Crop combinations and interactions
Weed management
Cereals, pulses and oilseeds
Økologiske sædskifteforsøg - udbytter, kvik, grøngødning
Økologisk Landsforening
2001-10
Newspaper or magazine article
NonPeerReviewed
source
en
/id/eprint/237/1/OJ01_249_6.doc
Rasmussen, Ilse A. (2001) Nyt fra de økologiske sædskifteforsøg - alle forsøgsparceller er høstet. Økologisk Jordbrug, October 2001, 21 (249), p. 6.
oai:orgprints.org:239
2022-06-06T15:58:27Z
7374617475733D707562
7375626A656374733D34706C616E74:33636F6D706F7374
7375626A656374733D34706C616E74:3474696C6C616765
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/239/
Nyt fra de økologiske sædskifteforsøg - Vintersæden har overvintret rimeligt
Rasmussen, Ilse A.
Composting and manuring
Soil tillage
Cereals, pulses and oilseeds
Økologiske sædskifteforsøg - jordstruktur, fosfor, kalium
Økologisk Landsforening
2000-04
Newspaper or magazine article
NonPeerReviewed
source
en
/id/eprint/239/1/OJ00_215_8.doc
Rasmussen, Ilse A. (2000) Nyt fra de økologiske sædskifteforsøg - Vintersæden har overvintret rimeligt. Økologisk Jordbrug, April 2000, 20 (215), p. 8.
oai:orgprints.org:240
2022-06-06T15:58:27Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/240/
Nyt fra de økologiske sædskifteforsøg - aktiviteter i marken lige nu
Rasmussen, Ilse A.
Crop combinations and interactions
Weed management
Cereals, pulses and oilseeds
Økologiske sædskifteforsøg - ukrudtsbekæmpelse
Økologisk Landsforening
2001-04
Newspaper or magazine article
NonPeerReviewed
source
en
/id/eprint/240/1/OJ01_239_6.doc
Rasmussen, Ilse A. (2001) Nyt fra de økologiske sædskifteforsøg - aktiviteter i marken lige nu. Økologisk Jordbrug, April 2001, 21 (239), p. 6.
oai:orgprints.org:241
2022-06-06T15:58:27Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/241/
Nyt fra de økologiske sædskifteforsøg
Rasmussen, Ilse A.
Crop combinations and interactions
Weed management
Cereals, pulses and oilseeds
Økologiske sædskifteforsøg - kvik og såtid
Økologisk Landsforening
2000-08
Newspaper or magazine article
NonPeerReviewed
source
en
/id/eprint/241/1/OJ00_221_8.doc
Rasmussen, Ilse A. (2000) Nyt fra de økologiske sædskifteforsøg. Økologisk Jordbrug, August 2000, 20 (221), p. 8.
oai:orgprints.org:242
2022-06-06T15:48:18Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/242/
Nyt fra de økologiske sædskifteforsøg - Lige nu i marken
Rasmussen, Ilse A.
Crop combinations and interactions
Weed management
Cereals, pulses and oilseeds
Økologiske sædskifteforsøg - ukrudtsbekæmpelse, rodukrudt
Økologisk Landsforening
1999-05
Newspaper or magazine article
NonPeerReviewed
source
en
/id/eprint/242/1/OJ99_194_10.doc
Rasmussen, Ilse A. (1999) Nyt fra de økologiske sædskifteforsøg - Lige nu i marken. Økologisk Jordbrug, May 1999, 19 (194), p. 10.
oai:orgprints.org:243
2022-06-06T15:48:18Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/243/
Nyt fra de økologiske sædskifteforsøg - Lige nu i marken
Rasmussen, Ilse A.
Crop combinations and interactions
Weed management
Cereals, pulses and oilseeds
Økologiske sædskifteforsøg - høstudbytte og rodukrudt
Økologisk Landsforening
1999-09
Newspaper or magazine article
NonPeerReviewed
source
en
/id/eprint/243/1/OJ99_200_8.doc
Rasmussen, Ilse A. (1999) Nyt fra de økologiske sædskifteforsøg - Lige nu i marken. Økologisk Jordbrug, September 1999, 19 (200), p. 8.
oai:orgprints.org:244
2010-04-12T07:27:20Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3977656564
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/244/
Sådan kan spildraps måske begrænses
Rasmussen, Ilse A.
Production systems
Weed management
spildraps som ukrudt kan begrænses ved at lade jorden ligge urørt efter høst af raps eller ved en overfladisk harvning.
Dansk Landbrugs Grovvareselskab
2001-06
Newspaper or magazine article
NonPeerReviewed
other
en
/id/eprint/244/1/produktion_2.jpg
Rasmussen, Ilse A. (2001) Sådan kan spildraps måske begrænses. Produktion - DLGs Landbrugsmagasin, June 2001.
oai:orgprints.org:245
2022-06-06T15:48:18Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D7265706F727463686170746572
https://orgprints.org/id/eprint/245/
Ukrudt i økologiske kornsædskifteforsøg
Rasmussen, Ilse A.
Askegaard, Margrethe
Olesen, Jørgen E.
Production systems
Weed management
Cereals, pulses and oilseeds
Der er igangsat forsøg med økologiske sædskifter på fire forskellige steder i Danmark, afspejlende forskellige klima- og jordbundsforhold. De fire sædskifter har forskellig andel af kvælstoffikserende afgrøder hhv. korn til modenhed, med og uden fangafgrøder og med og uden husdyrgødning. Forsøgene har været gennemført i 1997 og 1998. I forsøgene er bl.a. registreret ukrudt. Det er for tidligt at sige noget om ukrudtets udvikling i de forskellige sædskifter. Der er mest ukrudt i vintersæden begge forsøgsår alle steder. I 1997 er der i de vårsåede afgrøder mest ukrudt i byg/ært. Der er signifikant mest ukrudt i de gødede led af vinterhveden i forhold til de ugødede i Flakkebjerg 1997 og Foulum 1998. Ukrudtsbekæmpelsen har kun haft signifikant effekt på ukrudtets biomasse i vinterhveden i Foulum, hvor der i 1997 er mest ukrudt i de ubehandlede led, i 1998 er mest ukrudt i det børsterensede led, men næstmest i det ubehandlede. I Flakkebjerg var der i 1997 signifikant færrest ukrudtsplanter i havren i de ukrudtsharvede led. Der forekom i 1998 alm. kvik alle steder bortset fra i Foulum, og agertidsler i Flakkebjerg. Efter høst var der signifikant færre tidsler i parceller med efterafgrøde end uden.
Danmarks JordbrugsForskning
1999
Report chapter
NonPeerReviewed
application/pdf
en
/id/eprint/245/1/16.PVK990125.PDF
application/pdf
en
/id/eprint/245/2/16PVK99.PDF
Rasmussen, Ilse A.; Askegaard, Margrethe and Olesen, Jørgen E. (1999) Ukrudt i økologiske kornsædskifteforsøg. In: 16. Danske Planteværnskonference, Plantebeskyttelse i økologisk jordbrug, Sygdomme og skadedyr. DJF-rapport, Markbrug, no. 10. Danmarks JordbrugsForskning, pp. 17-28.
oai:orgprints.org:246
2010-04-12T07:27:21Z
7374617475733D707562
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/246/
Strategier for ukrudtsbekæmpelse i økologisk vinterhvede
Rasmussen, Ilse A.
Weed management
Cereals, pulses and oilseeds
Ukrudt kan være et stort problem og reducere udbyttet af økologisk dyrket vinterhvede. Ukrudtsharvning kan skade hveden når den udføres om efteråret, og kan give utilstrækkelig effekt mod oprette ukrudtsarter med pælerod når den udføres om foråret. Forsinket såning af vinterhvede fra sidst i september til først i oktober har tidligere vist sig at kunne reducere ukrudtsmængden når der ikke udførtes ukrudtsbekæmpelse. En forsøgsrække blev gennemført med niveau af mekanisk ukrudtsbekæmpelse, såstrategi (tidlig hhv. sen såning eller falsk såbed), rækkeafstand (normal, ca. 12 cm eller stor, ca. 24 cm) og ukrudtsbekæmpelse (ubehandlet, mekanisk eller herbicid). To forsøg blev udført på marker med højt ukrudtstryk med en høj forekomst af oprette ukrudtsarter, mens et tredje forsøg blev udført på en mark med lavere ukrudtstryk og uden oprette ukrudtsarter. Om foråret var der færre ukrudtsplanter ved normal rækkeafstand end ved høj i de ukrudtsrige forsøg. På samme tidspunkt var der en tendens til færre ukrudtsplanter ved sen såning, og flere ved tidlig. Efter ukrudtsbekæmpelse var ukrudtsbiomasse lavest ved herbicidbehandling og højest uden ukrudtsbekæmpelse. Ukrudtets biomasse ved mekanisk ukrudtsbekæmpelse lå i midten. Sen såning resulterede i mindst ukrudtsbiomasse, og tidlig såning gav den højeste, men tendensen var mest tydelig ved mekanisk ukrudtsbekæmpelse. Udbyttet var størst ved herbicidbehandling og lavest i ubehandlet. Der var ingen signifikante forskelle på udbyttet ved såstrategi og rækkeafstand, men en tendens til højere udbytte ved tidlig såning med herbicid, og ved sen såning med mekanisk ukrudtsbekæmpelse.
Anbefalinger uddraget af disse forsøg går ud på at så tidligt ved normal rækkeafstand og udføre ukrudtsharvning når der er et lavt ukrudtstryk, og at så sent ved stor rækkeafstand og bruge radrensning som en del af den mekaniske bekæmpelse når der er et højt ukrudtstryk. Falsk såbed ser ikke ud til at være et relevant alternativ i vinterhvede under disse betingelser.
Danmarks JordbrugsForskning
2001
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/246/1/18PVK.PDF
application/pdf
en
/id/eprint/246/2/18PVKOH.PDF
Rasmussen, Ilse A. (2001) Strategier for ukrudtsbekæmpelse i økologisk vinterhvede. In: DJF-rapport nr. 40, Markbrug. 18. Danske Planteværnskonference, Danmarks JordbrugsForskning, pp. 197-210.
oai:orgprints.org:247
2022-06-06T15:48:18Z
7374617475733D707562
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:38706C616E746865616C7468
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/247/
Plant protection in an organic crop rotation experiment for grain production
Rasmussen, Ilse A.
Askegaard, Margrethe
Olesen, Jørgen E.
Weed management
Crop health, quality, protection
Cereals, pulses and oilseeds
The plant protection carried out in the Danish crop rotation experiment is described. These measures can be quite different in the different systems. While mechanical weed control can be carried out in systems without catch crops, it is not possible to do so in systems with catch crops without affecting the establishment of the catch crop.
The occurrence of weeds, pests and diseases is recorded, and the results are described. Since the results are only from the two first years of the experiments, it is not possible to conclude anything about the crop rotations as such. There are however differences related to the other experimental treatments in the experiment: the presence or absence of catch crops and manure. Only in very few cases are the differences statistically significant.
Danish Research Centre for Organic Farming
Olesen, Jørgen E.
Eltun, Ragnar
Gooding, Mike J.
Jensen, Erik Steen
Köpke, Ulrich
1999
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/247/1/DARCOF1.PDF
application/pdf
en
/id/eprint/247/2/workshopiar.PDF
Rasmussen, Ilse A.; Askegaard, Margrethe and Olesen, Jørgen E. (1999) Plant protection in an organic crop rotation experiment for grain production. In: Olesen, Jørgen E.; Eltun, Ragnar; Gooding, Mike J.; Jensen, Erik Steen and Köpke, Ulrich (Eds.) DARCOF report no. 1: Designing and testing crop rotations for organic farming. Proceedings from an international workshop, Danish Research Centre for Organic Farming, pp. 321-330.
oai:orgprints.org:248
2022-06-06T15:48:18Z
7374617475733D707562
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/248/
Weed control in organic crop rotations for grain production
Rasmussen, Ilse A.
Askegaard, Margrethe
Olesen, Jørgen E.
Weed management
Cereals, pulses and oilseeds
Weed management carried out in organic crop rotation experiments for grain production. Preliminary results.
European Weed Research Society
Kropff, M.J.
Gut, D.
Streibig, J.C.
Baumann, D.T.
1999
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/248/1/EWRS990325.PDF
application/pdf
en
/id/eprint/248/2/ewrs99.PDF
Rasmussen, Ilse A.; Askegaard, Margrethe and Olesen, Jørgen E. (1999) Weed control in organic crop rotations for grain production. In: Kropff, M.J.; Gut, D.; Streibig, J.C. and Baumann, D.T. (Eds.) Proceedings 11th EWRS Symposium, European Weed Research Society, p. 98.
oai:orgprints.org:249
2022-06-06T15:58:28Z
7374617475733D707562
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/249/
Weed control in organic crop rotation experiments for grain production
Rasmussen, Ilse A.
Askegaard, Margrethe
Olesen, Jørgen E.
Weed management
Cereals, pulses and oilseeds
Weed control methods in organic crop rotation experiments for grain production. Preliminary results.
vdf Hochschulverlag AG an der ETH Zürich
Alföldi, T.
Lockeretz, W.
Niggli, U.
2000
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/249/1/rotations.PDF
application/pdf
en
/id/eprint/249/2/IFOAM2000_poster.PDF
Rasmussen, Ilse A.; Askegaard, Margrethe and Olesen, Jørgen E. (2000) Weed control in organic crop rotation experiments for grain production. In: Alföldi, T.; Lockeretz, W. and Niggli, U. (Eds.) Proceedings 13th International IFOAM Scientific Conference, vdf Hochschulverlag AG an der ETH Zürich, p. 182.
oai:orgprints.org:250
2022-06-06T15:54:24Z
7374617475733D707562
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/250/
Recent advances in weed management in cereals in Denmark
Rasmussen, Ilse A.
Melander, Bo
Rasmussen, Karsten
Jensen, Rikke K.
Hansen, Preben K.
Rasmussen, Gitte
Christensen, Svend
Rasmussen, Jesper
Weed management
Cereals, pulses and oilseeds
Cultural methods for prevention and improved crop competitiveness against weeds and mechanical weed control.
vdf Hochschulverlag AG an der ETH Zürich
Alföldi, T.
Lockeretz, W.
Niggli, U.
2000
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/250/1/management.PDF
application/pdf
en
/id/eprint/250/2/IFOAM2000_2.pdf
Rasmussen, Ilse A.; Melander, Bo; Rasmussen, Karsten; Jensen, Rikke K.; Hansen, Preben K.; Rasmussen, Gitte; Christensen, Svend and Rasmussen, Jesper (2000) Recent advances in weed management in cereals in Denmark. Paper at: 13th IFOAM Scientific Conference, Basel, Switzerland, 28 to 31 August 2000.
oai:orgprints.org:256
2010-04-12T07:27:21Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:35766567657461626C6573
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/256/
Utilising differences in rooting depth to design vegetable crop rotations with high nitrogen use efficiency (NUE)
Thorup-Kristensen, K
Vegetables
A number of methods involving plant or soil analysis or modelling have been developed to optimise N fertilization of vegetable crops. The methods aim at improving the NUE of each single crop, but do not really consider the crop rotation as such. Various measures can be used to increase the NUE of the crop rotation; measures that can be combined with the methods aimed at optimising NUE of each single crop.
The aims of the paper are to discuss the methods for optimising NUE at the crop rotation level and to present examples of how this can be done. The main methods discussed are 1) how can crops with different rooting depth be optimally placed in a cropping sequence and 2) how can catch crops be introduced to optimise NUE.
Results show that if N left in the soil after harvest on one crop is retained in the soil until spring, it will normally be found in deeper soil layers. Therefore rooting depth of the vegetable crops is important. It is illustrated that by placing deep-rooted crops in the crop rotation preferentially where much N was left in the soil in the previous year can strongly increase the utilisation of the N residues.
It is also shown how catch crops can be used to maintain a high NUE, especially in situations where the farmers choose to grow shallow-rooted vegetables even though much N may be available in deeper soil layers.
ISHS
Booij, R
Neeteson, J
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/256/1/ActaHort_utilising_differences.pdf
Thorup-Kristensen, K (2002) Utilising differences in rooting depth to design vegetable crop rotations with high nitrogen use efficiency (NUE). In: Booij, R and Neeteson, J (Eds.) Acta Horticulturae, ISHS, 571, pp. 249-254.
oai:orgprints.org:257
2022-06-06T15:58:28Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/257/
Problemer med rodukrudt
Rasmussen, Ilse A.
Askegaard, Margrethe
Olesen, Jørgen E.
Crop combinations and interactions
Weed management
Cereals, pulses and oilseeds
Rodukrudtet bredte sig mere end forudset i forsøgssædskifterne og bekæmpes med sædskifte, fangafgrøder og mekanik
Økologisk Landsforening
2002-04
Newspaper or magazine article
NonPeerReviewed
other
en
/id/eprint/257/1/OJ02_263_8.jpg
Rasmussen, Ilse A.; Askegaard, Margrethe and Olesen, Jørgen E. (2002) Problemer med rodukrudt. Økologisk Jordbrug, April 2002, 22 (263), p. 8.
oai:orgprints.org:258
2022-06-06T15:58:28Z
7374617475733D707562
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/258/
Ukrudtsbekæmpelse i økologisk dyrket vintersæd: resultater og erfaringer
Rasmussen, Ilse A.
Melander, Bo
Weed management
Cereals, pulses and oilseeds
I Danmark dyrkes en del vintersæd økologisk – især vinterhvede, men også rug og triticale. Et af problemerne i vintersæden kan være ukrudtsbekæmpelse. Mekanisk ukrudtsbekæmpelse i vintersæd frembyder både nogle problemer og nogle muligheder. Forskningsresultater viser, at med et lavt ukrudtstryk kan vintersæden sås til normal tid ved almindelig rækkeafstand og der kan udføres ukrudtsbekæmpelse ved ukrudtsharvning efterår og forår, men ved højt ukrudtstryk og især forekomst af arter med pælerod og strækningsvækst som lugtløs kamille (Tripleurospermum inodorum), korn-valmue (Papaver rhoeas) m.fl. vil det være mere hensigtsmæssigt at så sent, på stor rækkeafstand og med høj udsædsmængde, så der kan udføres radrensning kombineret med ukrudtsharvning. I det følgende vil vi gennemgå de væsentligste resultater og erfaringer fra de seneste års forskning.
Sveriges Lantbruksuniversitet
2001-11
Newspaper or magazine article
NonPeerReviewed
application/pdf
en
/id/eprint/258/1/FnyttIAR_BME.pdf
Rasmussen, Ilse A. and Melander, Bo (2001) Ukrudtsbekæmpelse i økologisk dyrket vintersæd: resultater og erfaringer. Forskningsnytt om økologisk landbruk i Norden, November 2001 (6), pp. 9-11.
oai:orgprints.org:259
2022-06-06T15:58:28Z
7374617475733D707562
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/259/
Nye og bedre sædskifter
Rasmussen, Ilse A.
Askegaard, Margrethe
Olesen, Jørgen E.
Crop combinations and interactions
Cereals, pulses and oilseeds
Havre og rug erstatter hvede i forsøgssædskifte på sandjord.
Økologisk Landsforening
2001-04
Newspaper or magazine article
NonPeerReviewed
other
en
/id/eprint/259/2/OJ01_238_9.jpg
application/pdf
en
/id/eprint/259/3/OJ01_238_9.PDF
Rasmussen, Ilse A.; Askegaard, Margrethe and Olesen, Jørgen E. (2001) Nye og bedre sædskifter. Økologisk Jordbrug, April 2001, 21 (238), p. 9.
oai:orgprints.org:260
2010-04-12T07:27:21Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:35766567657461626C6573
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/260/
Root growth and soil nitrogen depletion by onion, lettuce, early cabbage and carrot
Thorup-Kristensen, K.
Vegetables
Experiments examining root growth, the utilization of N and the effect of green manures were carried out on four vegetable crops. Large differences were observed both in rooting depth penetration rates, and in final rooting depth and distribution. Onion had a very low depth penetration rate, carrot an intermediate rate, and lettuce and cabbage showed high rates. A combination of depth penetration rates and duration of growth determined rooting depth at harvest. Therefore, lettuce, which had a very short growing season, had a shallow root system at harvest, whereas carrot with a lower depth penetration rate but a long growing season had deep rooting at harvest. The final rooting depth of the vegetables varied from approximately 0.3 m for onion to more than 1.0 m for carrot and early cabbage. Carrot and cabbage were able to utilize N from deeper soil layers, not available to onion and lettuce. The ability of green manure crops to concentrate available N in the upper soil layers was especially valuable when they were grown before the two shallow rooted crops.
ISHS
Rahn, CR
Lillywhite, RD
De Neve, S
Fink, M
Ramos, C
2001
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/260/1/ActaHort_Root_growth_and.pdf
Thorup-Kristensen, K. (2001) Root growth and soil nitrogen depletion by onion, lettuce, early cabbage and carrot. In: Rahn, CR; Lillywhite, RD; De Neve, S; Fink, M and Ramos, C (Eds.) Acta Horticulturae, ISHS, 563, pp. 201-205.
oai:orgprints.org:261
2022-06-06T15:48:18Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3977656564
74797065733D6E65777361727469636C65
https://orgprints.org/id/eprint/261/
Beskidte rækkeafgrøder giver ukrudt i kornet
Rasmussen, Ilse A.
Rasmussen, Jesper
Production systems
Weed management
Mislykkes bekæmpelsen af ukrudt i rækkeafgrøder, kan det give store ukrudtsproblemer flere år senere, viser ny resultater fra danske forsøg.
Økologisk Landsforening
2000-05
Newspaper or magazine article
NonPeerReviewed
other
en
/id/eprint/261/1/Renmajs_1.jpg
other
en
/id/eprint/261/2/Renmajs_2.jpg
Rasmussen, Ilse A. and Rasmussen, Jesper (2000) Beskidte rækkeafgrøder giver ukrudt i kornet. Økologisk Jordbrug, May 2000, 20 (217), p. 14.
oai:orgprints.org:263
2010-04-12T07:27:21Z
7374617475733D707562
7375626A656374733D34706C616E74:38706C616E746865616C7468
7375626A656374733D34706C616E74:37706C616E746272656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D746865736973
https://orgprints.org/id/eprint/263/
Hvedens stinkbrand - en udfordring for principperne for økologisk jordbrug
Borgen, Anders
Crop health, quality, protection
Breeding, genetics and propagation
Cereals, pulses and oilseeds
I afhandlingen beskrives principperne for økologisk plantebeskyttelse og der argumenteres for, at en plantesygdom som stinkbrand primært bør forebygges frem for at blive bekæmpet i et økologisk dyrkningssystem. Stinkbrandens biologi analyseres med henblik på at finde mulige forebyggende dyrkningsmetoder. Endvidere undersøges mulige bekæmpelsesmetoder, som er tilpasset økologisk jordbrug. Det konkluderes, at der findes forebyggende metoder, og at det er sandsynligt, at en systematisk udnyttelse af disse vil kunne forhindre hovedparten af problemerne med sygdommen. Det konkluderes endvidere, at der er muligheder for bekæmpelse i økologisk jordbrug, som kan bruges som sikkerhedsnet under dyrkningssystemet.
I afhandlingen gengives 6 eksperimentelle artikler, som dækker udvalgte emner inden for stinkbrandens biologi og bekæmpelse. Det vises, at stinkbranden kan agere som jordbåren patogen også i dyrkningssystemer med flere års dyrkning af ikke modtagelige afgrøder. Det dokumenteres, at mejetærskeren kan fungere som spredningsvektor for sporer, og at der i de første 3-4 tømninger af en mejetærskers korntank efter høst af en angreben mark er risiko for at overføre sporer til en efterfølgende afgrøde. Det vises, at stinkbrand kan bekæmpes fuldstændig ved neddypning i varmt vand i 1-5 minutter ved 50-55ºC uden påviselig negativ påvirkning af kornets spiring. Patogenet er mest følsom over for temperaturen, mens kornet er mere følsom over for tiden ved den pågældende temperatur. Stinkbrand kan bekæmpes ved coatning med mælkepulver, dog ikke uden negativ effekt på kornets spiringshastighed. Den negative effekt på spiringen er proportional med doseringen af mælkepulver, medens effekten på patogenet er størst med lav dosering. Herved er der en høj selektivitet ved lave doseringer, der kan udnyttes i kombination ved andre metoder. Det vises at nogle biologiske midler har en effekt, men at der ikke p.t. er kommercielt tilgængelige biologiske midler, der alene kan bekæmpe sygdommen effektivt. Ved at kombinere behandling med mælkepulver og biologiske midler forbedres mulighederne for at udvikle et biologisk middel til bekæmpelse af stinkbrand. Det vises, at man i de fleste hvedesorter kan gennemføre eksperimentelt arbejde med stinkbrand ved at basere diagnosen på bladsymptomer i stedet for akssymptomer, hvilket kan nedsætte tidsforbruget f.eks. ved eksperimentelt arbejde med udvikling af bekæmpelsesmetoder.
Anders Borgen
2000-08
Thesis
NonPeerReviewed
application/pdf
en
/id/eprint/263/1/Ph.D.-afhandling.pdf
Borgen, Anders (2000) Hvedens stinkbrand - en udfordring for principperne for økologisk jordbrug. Thesis, Den Kongelige Veterinær- og Landbohøjskole , Institut for Jordbrugsvidenskab. Anders Borgen.
oai:orgprints.org:276
2010-04-12T07:27:22Z
7374617475733D707562
7375626A656374733D34706C616E74:33636F6D706F7374
7375626A656374733D34706C616E74:31706C616E7470726F64
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/276/
Konkurrence mellem afgrøde og ukrudt om tilført husdyrgødningskvælstof
Petersen, Jens
Composting and manuring
Production systems
Weed management
Cereals, pulses and oilseeds
The experiment was performed in the two spring barley fields in the organic six-course crop rotation at Foulumgaard, Denmark (56º 30’ N, 9º 35’ E). The preceding crops were a 2nd year clover-grass and cereal/beets and the weed density in the spring barley was 300 and 1800 plants/m2, respectively. Pig slurry was applied by hand in micro plots (3040 cm) by four methods: broadspreading (incorporated with good slurry-soil contact) or injected in bands to depths of 5, 10 or 15 cm (reduced slurry-soil contact). Immediately after application, the slurry was covered by at least 1-2 cm soil to prevent ammonia volatilisation.
During the tillering and elongation phase, the spring barley and weeds were sampled six times at intervals of 5-6 days. The last sampling corresponds to about ear emergence. The effect of application method on dry matter production and nitrogen uptake in the spring barley and the weeds was reported. In addition, the ammonia fraction of the pig slurry was enriched with isotopic labelled nitrogen. Thus, also the plant recovery of applied ammonia nitrogen in the pig slurry was calculated for the crop as well as the weeds.
Direct injection combined with placement of the slurry band in relation to the crop row influences the competition between crop and weed for applied nitrogen. The results show that the weed is a significant competitor for applied nitrogen when the slurry is broadspread and incorporated. Banding by direct injection reduces the slurry-soil contact and the competition balance moves in favour of the crop. Thus, the crop recovery of applied nitrogen may be increased and simultaneously the weed recovery may be reduced.
Danmarks JordbrugsForskning
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/276/1/Konkurrence_mellem_afgr.pdf
Petersen, Jens (2002) Konkurrence mellem afgrøde og ukrudt om tilført husdyrgødningskvælstof. In: DJF-rapport nr. 64 Markbrug, Danmarks JordbrugsForskning, pp. 119-127.
oai:orgprints.org:280
2013-04-28T18:36:53Z
7374617475733D707562
7375626A656374733D34706C616E74:33636F6D706F7374
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/280/
Weed - spring barley competition for applied nitrogen in pig slurry
Petersen, J.
Composting and manuring
Weed management
Cereals, pulses and oilseeds
The experiments were carried out in the two spring barley fields of the organic six-course cattle:crop rotation at Foulumgaard,Denmark. The weed density was 300 and 1800 plants m-2 respectively. Pig slurry was applied by hand in microplots by four methods:broadcasting followed by incorporation,or injected in bands to depths of 5,10 or 15 cm. Spring barley and weeds were sampled separately six times during the tillering and elongation phase of the spring barley. The effect of application method on dry-matter (d.m.)production, nitrogen uptake and recovery of applied nitrogen in the spring barley and the weeds is reported. Slurry banding halved the weed d.m. and weed N uptake compared with broadcasting,irrespective of weed density. Weeds recovered up to 12%of the applied nitrogen, which made them a signi ficant competitor when the slurry was broadcast and incorporated. Banding by direct injection reduced the slurry:soil contact and the weed:crop competition balance for applied nitrogen moved in favour of the crop. Thus, the crop recovery of applied nitrogen at the end of the sampling period was increased from approximately 45% for broadcast and incorporated to approximately 50% for injected slurry, and coincidental weed recovery was reduced to a maximum of 5%. As the nitrogen supply normally affects plant d.m. production, banding of slurry might well improve crop competitiveness and its tolerance to mechanical weed control.
European Weed Research Society
2003
Journal paper
NonPeerReviewed
other
en
/id/eprint/280/2/The_paper_is_available_at_the_library.doc
application/pdf
en
/id/eprint/280/3/Weed_spring_barley_competition_for_applied_nitrogen.pdf
Petersen, J. (2003) Weed - spring barley competition for applied nitrogen in pig slurry. Weed Research (43), pp. 33-39.
oai:orgprints.org:282
2010-04-12T07:27:22Z
7374617475733D756E707562
7375626A656374733D34706C616E74:33636F6D706F7374
7375626A656374733D34706C616E74:3977656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/282/
Afgrøde og ukrudt konkurrerer om kvælstof
Petersen, J.
Eskesen, K.
Composting and manuring
Weed management
Cereals, pulses and oilseeds
Udbringningsmetoden for gylle påvirker konkurrencen mellem afgrøde og ukrudt om tilført kvælstof. Ved bredspredning af gødningen kan ukrudtet optage en betydelig del af den tilførte gødning, og dermed bliver ukrudtet en konkurrent til afgrøden. Forholdet i ukrudt/afgrøde konkurrencen om den tilførte gødning kan forskydes til afgrødens fordel ved direkte nedfældning af gødningen.
I dette års forsøg undersøges hvilken betydning afstanden mellem kornrækken og gødningsstrengen har for konkurrence mellem afgrøde og ukrudt om tilført kvælstof. Der er udvalgt en vårsæds-mark med en høj naturlig ukrudtsbestand. Den lille parcelstørrelse (30?40 cm) skyldes, at den tilførte gylle er tilsat isotopmærket kvælstof. Herved er det muligt at beregne, hvor stor en andel af det tilførte kvælstof afgrøden henholdsvis ukrudtet optager.
2002
Conference paper, poster, etc.
NonPeerReviewed
other
en
/id/eprint/282/1/poster_c1.ppt
Petersen, J. and Eskesen, K. (2002) Afgrøde og ukrudt konkurrerer om kvælstof. Poster at: Åbent hus, Foulumgård, 13 june 2002. [Unpublished]
oai:orgprints.org:286
2010-04-12T07:27:22Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/286/
The influence of phosphorus deficiency on growth and nitrogen fixation of white clover plants
Høgh-Jensen, Dr Henning
Schjoerring, Dr Jan K.
Soussana, Dr Jean-Francois
Pasture and forage crops
The effects of P deficiency on growth, N2-fixation and photosynthesis in white clover (Trifolium repens L.) were investigated using three contrasting relative addition rates of P, or following abrupt withdrawal of the P supply. Responses to a constant below-optimum P supply rate consisted of a decline in N2-fixation per unit root weight and a small reduction in the efficiency with which electrons were allocated to the reduction of N2 in the nodules. Abrupt P removal arrested nodule growth and caused a substantial decline in nitrogenase activity per unit root weight, but not per unit nodule mass.
Similarly, the rate of photosynthesis per unit leaf area was unaffected by abrupt P removal, while the CO2 acquisition for the plant as a whole decreased due to a decline in total leaf area, leaf area per unit leaf weight and utilisation of incoming radiation. These changes followed the decline in tissue P concentrations. The ratio between CO2-fixation and N2-fixation was maintained under short-term P deprivation but increased under long-term low P supply indicating a down-regulation of nodule activity following morphological and growth adjustments. It is concluded that N2-fixation does not limit the growth of clover plants experiencing P deficiency. A low P status induces changes in the relative growth of roots, nodules, and shoots rather than changes in N and/or C uptake rates per unit mass or area of these organs.
2002-12
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/286/1/Pstress-final.pdf
Høgh-Jensen, Dr Henning; Schjoerring, Dr Jan K. and Soussana, Dr Jean-Francois (2002) The influence of phosphorus deficiency on growth and nitrogen fixation of white clover plants. Annals of Botany, 90, pp. 745-753.
oai:orgprints.org:288
2010-04-12T07:27:22Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D34706C616E74:3263726F70636F6D62
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/288/
Rhizodeposition of nitrogen by red clover, white clover and ryegrass leys
Høgh-Jensen, Dr Henning
Schjoerring, Dr Jan K.
Nutrient turnover
Crop combinations and interactions
Pasture and forage crops
Correct assessment of the rhizodeposition of N in grassland is essential for evaluation of the biological N2-fixation of legumes, for the total N balance of agro-ecosystems, and for the pre-cropping value of grasslands. Using a leaf-feeding technique by which plants were 15N labelled while growing in mezotrons in the field, the rhizodeposition of N by unfertilised red clover, white clover and perennial ryegrass growing in pure stands was shown to amount to 64, 71 and 9 g N m-2, respectively, over two complete growing seasons. The corresponding values for red clover and white clover growing in mixtures with ryegrass were 89 and 32 g N m-2, respectively. The rhizodeposited N compounds, including fine roots, constituted more than 80% of the total plant-derived N in the soil, and in all cases exceeded the amount of N present in stubble. In the mixtures of red clover-ryegrass and white clover-ryegrass and the pure stands of red clover, white clover and ryegrass, respectively, the rhizodeposition constituted a 1.05, 1.52, 1.26, 2.21 and 2.77 fold increase over the total shoot N harvested during the two production years. In pure stands and mixtures of clover, 84 and 92%, respectively, of this N derived from biological N2 fixation. It is concluded that rhizodeposition provides a very substantial input of N to legume-based grassland systems with great consequences for ecosystem N balance and turnover. Furthermore, the amount of atmospheric-derived N in the rhizodeposits may exceed that in the harvested shoots.
2001
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/288/1/rhizo_deposition_final.pdf
Høgh-Jensen, Dr Henning and Schjoerring, Dr Jan K. (2001) Rhizodeposition of nitrogen by red clover, white clover and ryegrass leys. Soil Biology & Biochemistry, 33, pp. 439-448.
oai:orgprints.org:289
2010-04-12T07:27:22Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/289/
Regrowth and nutrient composition of different plant organs in grass-clover canopies as affected by phosphorus and potassium availability
Høgh-Jensen, Dr Henning
Fabricius, Vibeke
Schjoerring, Dr Jan K.
Pasture and forage crops
Regrowth after cutting and distribution of nitrogen (N), phosphorus (P) and potassium (K) in different plant organs of white clover and perennial ryegrass growing in pure or mixed swards, were investigated under field conditions in a soil with a low-to-moderate availability of P and K. In all treatments, white clover constituted more than 70% of the above-ground biomass in the mixed swards. The petioles were the dominant pool of dry matter throughout regrowth and contained the greatest amounts of N, P and K. Increased supply of P and K increased the growth of ryegrass, but not that of white clover in the mixed swards. The increased competition from ryegrass led to a decline in the yield of white clover laminae as well as in the N content per unit of dry matter in laminae, petioles and stolons. The P content of all white clover organs also declined following P application to the mixed swards, whereas K application increased their K contents. In the pure swards of ryegrass and white clover, yields and contents of N, P and K in the dry matter were either not affected or increased with P and K application. It was calculated that commonly used defoliation heights may remove 80% or more of the nutrient and dry matter pools located in the petioles but the remaining quantities of dry matter and nutrients in the petioles will normally exceed the corresponding quantities in the stolons.
2001
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/289/2/Vibeke_final.pdf
Høgh-Jensen, Dr Henning; Fabricius, Vibeke and Schjoerring, Dr Jan K. (2001) Regrowth and nutrient composition of different plant organs in grass-clover canopies as affected by phosphorus and potassium availability. Annals of Botany, 88, pp. 153-162.
oai:orgprints.org:295
2010-04-12T07:27:23Z
7374617475733D707562
7375626A656374733D35736F696C:346E75747269656E74
7375626A656374733D326661726D696E67
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D7265706F727463686170746572
https://orgprints.org/id/eprint/295/
Indirekte beregning af N-fiksering
Kristensen, Ib Sillebak
Dalgaard, Randi
Kristensen, Troels
Nutrient turnover
Farming Systems
Pasture and forage crops
Cereals, pulses and oilseeds
Indirekte beregning af N-fiksering dels ud fra målt udbytte af bælgplantetørstof, dels ud fra bedømt kløverdækning og dels ud fra ukendt kløverandel.
Danmarks JordbrugsForskning
2002
Report chapter
NonPeerReviewed
source
en
/id/eprint/295/1/NFIX_red_ISK.doc
Kristensen, Ib Sillebak; Dalgaard, Randi and Kristensen, Troels (2002) Indirekte beregning af N-fiksering. In: Kvælstofbalancer på landbrugsbedriften – status og perspektiv. Temamøde på Forskningscenter Foulum, 24. april 2002. Intern Rapport, no. 157. Danmarks JordbrugsForskning, pp. 31-40.
oai:orgprints.org:316
2010-04-12T07:27:24Z
7374617475733D756E707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/316/
Empirical model for quantification of symbiotic nitrogen fixation in leguminous crops
Høgh-Jensen, Henning
Loges, Ralf
Jensen, Erik Steen
Jørgensen, Finn V.
Vinther, Finn P.
Production systems
Symbiotically fixed N2 (SNF) is an important input of nitrogen (N) in many cropping systems. In spite of this fact, the input of fixed N to a particular cropping system is usually not known, and an exact estimation of the amount of N2 fixed requires laborious measurements. Consequently, there is a demand for a simple and reliable tool to estimate N2 fixation in leguminous crops. A model is here proposed for quantification of SNF in leguminous crops in different arable systems. The model estimates SNF using dry matter yield as input and cropping system specific values for the parameters: N concentration in dry matter and the proportion of the N in the legume that is derived from the atmosphere. Further, the model includes fixed N not included in the estimate of fixed N in aboveground plant tissue. Thus the model operates with the ratio of fixed N in below-ground plant tissue, the ratio of fixed N transferred below-ground to the grass, the ratio of fixed N transferred to the grass through the grazing animals and the ratio of fixed N immobilised to the soil organic pool by rhizodeposition. The model is able to predict the SNF in harvested biomass precisely (r2=0.91). However, independent data for validation of the amounts of fixed N located in pools belowground is lacking.
2003-01
Journal paper
NonPeerReviewed
other
en
/id/eprint/316/1/Emperical_N2-fixation_eng_v6.doc
Høgh-Jensen, Henning; Loges, Ralf; Jensen, Erik Steen; Jørgensen, Finn V. and Vinther, Finn P. (2003) Empirical model for quantification of symbiotic nitrogen fixation in leguminous crops. Agricultural Systems. [Unpublished]
oai:orgprints.org:318
2010-04-12T07:27:24Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/318/
Morphological plasticity by crop plants and their potassium use efficiency
Høgh-Jensen, Dr Henning
Pedersen, Morten B.
Production systems
A decrease in the use of fertilizers and a decrease in soil fertility direct the research focus towards the ability of the crops to adapt to low potassium conditions and to their ability to utilise sparingly soluble potassium sources. Pea (Pisum sativum), red clover (Trifolium pratense), lucerne (Medicago Sativa L.), barley (Hordium vulgare), rye (Secale cerale), perennial ryegrass (Lolium perenne L.), and oilseed rape (Brassica napus oliefera) were grown in thin layers of soils to study their root morphological plasticity and ability to utilise different potassium pools at 26 and 60 mg exchangeable K kg-1 soil. The legumes (pea, red clover, lucerne) accumulated larger amounts of nitrogen but lower amounts of potassium than rye, ryegrass, barley, and oilseed rape. The differences in potassium accumulation correlated with root hair length (R2=0.50). Rye had an outstanding root surface that in total as well as per unit root dry matter was twice that of the other crops. The ranking in decreasing order was rye, ryegrass, oilseed rape, lucerne, barley, pea and red clover. This ranking was unaffected (P>0.05) by the initial soil potassium content although the root surface in all cases increased when grown in soil low on potassium compared to soils with a better potassium supply. This increase was achieved by increasing root hair length as root hair density was similar (P>0.05) for all crops and soils. Efficient use of sparingly soluble potassium pools was important for all investigated crops. In conclusion, crops modify their root hair length as response to low potassium conditions and thereby maintain the uptake from sparingly soluble potassium sources.
2003
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/318/1/Morten-6.pdf
Høgh-Jensen, Dr Henning and Pedersen, Morten B. (2003) Morphological plasticity by crop plants and their potassium use efficiency. Journal of Plant Nutrition, 26 (5), pp. 969-984.
oai:orgprints.org:442
2010-04-12T07:27:29Z
7374617475733D707562
7375626A656374733D37666F6F64:327365637572697479
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D7265706F727463686170746572
https://orgprints.org/id/eprint/442/
Kvalitet af sidstindlejret protein i kernen ved ekstra kvælstofgødskning
Jørgensen, J.R.
Food security, food quality and human health
Cereals, pulses and oilseeds
Stort udbytte og god brødmelskvalitet er vigtige parametre ved dyrkning af brødhvede. Begge dele kan forbedres ved kvælstofgødningsstrategier, såsom mængde, tilførselstidspunkt, deling af gødning og kvælstofkilde.
Hvedekerner består af tre hovedbestanddele: kimet til den nye plante, frøhviden, der er næringsstofkilden til den nye plante, og skaldele, der beskytter frøet. Frøhviden, der indeholder ca. 80% af kernens protein, består primært af store kantede celler, der er fyldt med stivelse og yderst mod frøskallen et lag aleuronceller med et stort indhold af fedt og protein.
Waagepetersen, J.
Petersen, J.B.
Knudsen, L.
Deneken, G.
Jørgensen, J.R.
2001
Report chapter
NonPeerReviewed
application/pdf
en
/id/eprint/442/1/djfm53_kap10.pdf
Jørgensen, J.R. (2001) Kvalitet af sidstindlejret protein i kernen ved ekstra kvælstofgødskning. In: Waagepetersen, J.; Petersen, J.B.; Knudsen, L.; Deneken, G. and Jørgensen, J.R. (Eds.) Produktion af kvalitetshvede i Danmark, en oversigt over problemer og muligheder. DJF rapport Markbrug, no. 53. Danish Institute of Agricultural Sciences , Department of Plant Biology, chapter 10, pp. 67-70.
oai:orgprints.org:444
2010-04-12T07:27:29Z
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/444/
Agronomy and grain quality
Jørgensen, J.R.
Cereals, pulses and oilseeds
Agronomy and grain quality
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/444/1/Agronomy_and_grain_quality_Lund_2002.pdf
Jørgensen, J.R. (2002) Agronomy and grain quality. Speech at: Øresund Food Network Seminar: Innovative whole grain cereal products with health profile, Scandic Star Hotel, Lund, Sweden, 2-3 December 2002.
oai:orgprints.org:445
2010-04-12T07:27:29Z
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/445/
Proteinafgrøder i økologisk jordbrug - nøgen havre og højlysin byg
Jørgensen, J.R.
Cereals, pulses and oilseeds
Proteinafgrøder i økologisk jordbrug - nøgen havre og højlysin byg
2001
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/445/1/mso1EB_445.pdf
Jørgensen, J.R. (2001) Proteinafgrøder i økologisk jordbrug - nøgen havre og højlysin byg. Speech at: Møde vedr. demonstrationsprojekt om proteinafgrøder i økologisk jordbrug, Økologiens Hus, 5 April 2001.
oai:orgprints.org:446
2010-04-12T07:27:29Z
7375626A656374733D34706C616E74:31706C616E7470726F64:3363657265616C73
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/446/
Dyrkning af nøgen havre og højlysin byg
Jørgensen, J.R.
Cereals, pulses and oilseeds
Dyrkning af nøgen havre og højlysin byg
2001
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/446/1/Proteinafgr%C3%B8der_446.pdf
Jørgensen, J.R. (2001) Dyrkning af nøgen havre og højlysin byg. Speech at: Proteinafgrøder i økologisk jordbrug - dyrkning og fodring, Snoghøj IT-højskole, 28 November 2001.
oai:orgprints.org:447
2022-03-24T06:15:21Z
7374617475733D756E707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/447/
Intercropping as solution for organic grass seed production?
Boelt, B.
Production systems
Intercropping as solution for organic grass seed production?
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/447/1/Intercropping.pdf
Boelt, B. (2002) Intercropping as solution for organic grass seed production? In: Organic Seed Production and Plant Breeding - strategies, problems and perspectives. [Unpublished]
oai:orgprints.org:448
2010-04-12T07:27:29Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/448/
Legume seed production and research in Europe
Boelt, B.
Production systems
Legume seed production and research in Europe
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/448/1/Legume_seed_production.pdf
Boelt, B. (2002) Legume seed production and research in Europe. In: Forage Seed, 9 (1), pp. 33-34.
oai:orgprints.org:451
2013-12-03T13:32:40Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/451/
Organic forage seed production
Boelt, B.
Deleuran, L.C.
Production systems
From January 2004 only organically produced seed can be used in organic farming systems within the EU. Danish seed producers and seed companies are establishing an organic forage seed production in order to supply organic growers within the EU with high quality seed of recognised varieties. This brief paper outlines a project investigating improved cultivation and management techniques to ensure such a supply is met.
2000
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/451/1/Organic_forage_seed_production_1.pdf
Boelt, B. and Deleuran, L.C. (2000) Organic forage seed production. In: Proceedings 13th International IFOAM Scientific Conference, p. 228.
oai:orgprints.org:452
2010-04-12T07:27:29Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/452/
Utilization of forage cuts in organic grass seed production
Deleuran, L.C.
Boelt, B.
Production systems
Utilization of forage cuts in organic grass seed production
2000
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/452/1/Utilization_of_forage_cuts.pdf
Deleuran, L.C. and Boelt, B. (2000) Utilization of forage cuts in organic grass seed production. In: Proceedings of the 18th General Meeting of the European Grassland Federation, pp. 552-554.
oai:orgprints.org:453
2010-04-12T07:27:29Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D636F6E666572656E63655F6974656D
https://orgprints.org/id/eprint/453/
Økologisk hvidkløverdyrkning, kløversnudebillens betydning og bekæmpelsesmuligheder
Hansen, L.M.
Production systems
Økologisk hvidkløverdyrkning, kløversnudebillens betydning og bekæmpelsesmuligheder
2002
Conference paper, poster, etc.
NonPeerReviewed
application/pdf
en
/id/eprint/453/1/Okologisk_hvidklover.pdf
Hansen, L.M. (2002) Økologisk hvidkløverdyrkning, kløversnudebillens betydning og bekæmpelsesmuligheder. In: NJF-rapport nr. 341, pp. 87-93.
oai:orgprints.org:454
2013-12-03T13:31:59Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/454/
Frøgræs på rækker kan høstes i flere år
Boelt, B.
Deleuran, L.C.
Production systems
Frøgræs på rækker kan høstes i flere år
2002
Journal paper
NonPeerReviewed
source
en
/id/eprint/454/1/Froegraes.doc
Boelt, B. and Deleuran, L.C. (2002) Frøgræs på rækker kan høstes i flere år. Agrologisk Tidsskrift, 3, pp. 16-17.
oai:orgprints.org:455
2010-04-12T07:27:29Z
7374617475733D707562
7375626A656374733D34706C616E74:37706C616E746272656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/455/
Organic forage seed production in Denmark
Boelt, B.
Deleuran, L.C.
Gislum, R.
Breeding, genetics and propagation
Pasture and forage crops
Organic forage seed production in Denmark.
2002
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/455/1/newsletter34page3_4.pdf
Boelt, B.; Deleuran, L.C. and Gislum, R. (2002) Organic forage seed production in Denmark. IHSG Newsletter, 34, pp. 3-4.
oai:orgprints.org:456
2013-12-03T13:30:03Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/456/
Afgræsning af frøafgrøder med får
Boelt, B.
Production systems
Afgræsning af frøafgrøder med får
2001
Journal paper
NonPeerReviewed
source
en
/id/eprint/456/1/Afgraesning.doc
Boelt, B. (2001) Afgræsning af frøafgrøder med får. Dansk Frøavl, 8, p. 140.
oai:orgprints.org:457
2010-04-12T07:27:29Z
7374617475733D707562
7375626A656374733D34706C616E74:33636F6D706F7374
7375626A656374733D34706C616E74:37706C616E746272656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/457/
Aktuelt nyt fra Danmarks JordbrugsForskning, 2001
Boelt, B.
Clausen, D.
Gislum, R.
Hansen, L.M.
Composting and manuring
Breeding, genetics and propagation
Pasture and forage crops
Kvælstof er et værdifuldt næringsstof for opnåelse af et højt frøudbytte, men også i relation til justering af væksten i udlægsmarken. Desværre har mange frøavlere begrænset adgang til kvælstof – dels på grund af en kvælstofnorm, som er fastsat under den økonomisk optimale værdi og dels på grund af begrænset adgang til husdyrgødning på økologiske planteavlsbedrifter. I Forskningsprogram frøavl arbejdes med udvikling af en behovsbestemt gødningsstrategi for at opnå en bedre udnyttelse af den til rådighed værende kvælstofmængde. Imidlertid tyder igangværende forsøg på, at kvælstof findes i ’alternative kilder’ såsom frøgræshalm og grøngødningsafgrøder, men kan de udnyttes i frøavlen? En anden supplerende kvælstofkilde er en øget anvendelse af hvidkløver specielt i økologiske sædskifter – men kan der skaffes økologisk udsæd? I de følgende tre artikler præsenteres igangværende aktiviteter inden for disse områder ved Danmarks JordbrugsForskning (DJF).
2001
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/457/1/okt2001side7_9.pdf
Boelt, B.; Clausen, D.; Gislum, R. and Hansen, L.M. (2001) Aktuelt nyt fra Danmarks JordbrugsForskning, 2001. Tidsskrift for Frøavl, 2, pp. 7-10.
oai:orgprints.org:458
2013-12-03T13:30:39Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/458/
Samdyrkning af græs og kløver
Boelt, B.
Production systems
Samdyrkning af græs og kløver
2000
Journal paper
NonPeerReviewed
source
en
/id/eprint/458/1/Samdyrkning.doc
Boelt, B. (2000) Samdyrkning af græs og kløver. Dansk Frøavl, 9, pp. 150-151.
oai:orgprints.org:459
2010-04-12T07:27:29Z
7374617475733D707562
7375626A656374733D34706C616E74:37706C616E746272656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/459/
Forage cuts as a by-product in organic seed production
Deleuran, L.C.
Boelt, B.
Breeding, genetics and propagation
Pasture and forage crops
A major problem in organic grass seed production on arable farms is to provide for a sufficient nitrogen supply. A nitrogen-fixing crop may be able to cover the nitrogen requirement - wholly or partly. However mixed cropping of a grass seed and a nitrogen-fixing crop is expected to reduce the establishment of the seed crop, especially for species that require a long establishment period. One way to achieve a satisfactory establishment of the seed crop can be to introduce an intervening year for cutting forage between cover crop harvest and seed harvest. This will enhance tillering, since the light supply for the undersown grass is increased after each cut. However excessive biomass will hinder drying of the crop at maturity and therefore the growth of the nitrogen-fixing crop must be terminated or reduced in the seed production year. One of the first organic seed experiments at Research Centre Flakkebjerg focused on the above-mentioned factors.
2002
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/459/1/newsletter34page5_7.pdf
Deleuran, L.C. and Boelt, B. (2002) Forage cuts as a by-product in organic seed production. IHSG Newsletter, 34, pp. 5-7.
oai:orgprints.org:460
2010-04-12T07:27:29Z
7374617475733D707562
7375626A656374733D34706C616E74:37706C616E746272656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D7265706F7274
https://orgprints.org/id/eprint/460/
Rækkedyrkning af frøgræs
Deleuran, L.C.
Boelt, B.
Breeding, genetics and propagation
Pasture and forage crops
Etablering er en af de mest omkostningskrævende processer i frøgræsproduktionen. Derfor vil flere års frøavl på samme udlæg reducere dyrkningsomkostningerne, såfremt frøudbyttet kan opretholdes på et højt/acceptabelt niveau. I andre frøproducerende lande gennemføres græsfrøproduktionen fortrinsvis på rækker, og der høstes frø på samme udlæg i betydelig flere år, end det er praksis i Danmark.
2002
Report
NonPeerReviewed
application/pdf
en
/id/eprint/460/1/gvm247.pdf
Deleuran, L.C. and Boelt, B. (2002) Rækkedyrkning af frøgræs. Grøn Viden Markbrug, no. 247. .
oai:orgprints.org:462
2010-04-12T07:27:30Z
7374617475733D707562
7375626A656374733D34706C616E74:37706C616E746272656564
7375626A656374733D34706C616E74:31706C616E7470726F64:3170617374757265
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/462/
Nyt fra Danmarks JordbrugsForskning
Boelt, B.
Deleuran, L.C.
Gislum, R.
Breeding, genetics and propagation
Pasture and forage crops
Inden for de dyrkningstekniske forsøg i græsfrøavl er aktiviteterne for øjeblikket samlet omkring efterårsbehandlinger, snitning af frøgræshalm, rækkedyrkningssystemer samt gradueret gødskning, og inden for økologisk frøproduktion fokuseres på hvidkløver. Flere af disse forsøg blev etableret i 1996/97, da frøforsøgene flyttede fra Roskilde til ForskningscenterFlakkebjerg, og de forsøg er nu under afslutning.
2002
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/462/1/aug-sep2002side11_12.pdf
Boelt, B.; Deleuran, L.C. and Gislum, R. (2002) Nyt fra Danmarks JordbrugsForskning. Tidsskrift for Frøavl, 1, pp. 11-13.
oai:orgprints.org:463
2010-04-12T07:27:30Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/463/
Grøngødningsafgrøder kan medvirke til et højt frøudbytte i økologisk dyrket almindelig rajgræs
Gislum, R.
Boelt, B.
Jensen, E.S.
Production systems
Grøngødningsafgrøder kan medvirke til et højt frøudbytte i økologisk dyrket almindelig rajgræs
2001
Journal paper
NonPeerReviewed
source
en
/id/eprint/463/1/Forskningsnytt.doc
Gislum, R.; Boelt, B. and Jensen, E.S. (2001) Grøngødningsafgrøder kan medvirke til et højt frøudbytte i økologisk dyrket almindelig rajgræs. Forskningsnytt om økologisk landbrug i Norden, 5, pp. 4-5.
oai:orgprints.org:464
2010-04-12T07:27:30Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/464/
Snudebillerne er kommet
Hansen, L.M.
Production systems
Snudebillerne er kommet
2002
Journal paper
NonPeerReviewed
source
en
/id/eprint/464/1/Snudebillerne_er_kommet_for_at_blive.doc
Hansen, L.M. (2002) Snudebillerne er kommet. Dansk Frøavl, 85, p. 6.
oai:orgprints.org:465
2010-04-12T07:27:30Z
7374617475733D707562
7375626A656374733D34706C616E74:31706C616E7470726F64
74797065733D6A6F75726E616C70
https://orgprints.org/id/eprint/465/
Økologisk hvidkløver - hvordan kan det lade sig gøre?
Rohde, B.
Langer, V.
Hansen, L.M.
Production systems
Økologisk hvidkløver - hvordan kan det lade sig gøre?
2000
Journal paper
NonPeerReviewed
application/pdf
en
/id/eprint/465/1/465.pdf
Rohde, B.; Langer, V. and Hansen, L.M. (2000) Økologisk hvidkløver - hvordan kan det lade sig gøre? Dansk Frøavl, 9, pp. 148-149.
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