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Einfluss von Zwischenfrüchten auf Lachgasverluste und Nitratauswaschung im ökologischen Marktfruchtbau in Abhängigkeit von der Vorfrucht

Böldt, M.; Loges, Ralf; Kluss, Cristof and Taube, Friedhelm (2017) Einfluss von Zwischenfrüchten auf Lachgasverluste und Nitratauswaschung im ökologischen Marktfruchtbau in Abhängigkeit von der Vorfrucht. Paper at: 14. Wissenschaftstagung Ökologischer Landbau, Campus Weihenstephan, Freising-Weihenstephan, 07.-10. März 2017.

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All-arable organic farming systems, especially when they are working without organic fertilizer, are often in challenge with their nutrient management to fulfill the requirements of crops. In this context one of the main issues is to mitigate nutrient losses. Here the use of catch crops may one strategy to counteract against this. We hypothesized that under the climate conditions of north-west Germany winter hard catch crops are more suitable to reduce nitrogen (N) losses than catch crops killed by frost, here especially with cereals or legumes as previous crop. In a field experiment in 2015/16 we tested 3 different catch crops (grown in pure stand and in mixture with legumes) after peas and triticale for their nitrogen loss paths over the winter period. Soil mineral N content (0-90 cm) was determined before and after winter. Nitrous oxide (N2O) emissions were measured weekly. Nitrate (NO3) concentrations in leachate were analyzed once a week (Oct-Mar).The results show that corn legumes as pre crop have the highest N-loss potential over winter. In comparison, catch crops demonstrate a good reduction of nitrogen losses pathways like NO3 in leachate or gaseous N2O emissions. In particular significant lower nitrate losses via leaching were recorded after corn as pre crop. In comparison winter killed white mustard showed
significant higher NO3 and N2O losses over winter. Undersown catch crops showed the highest potential to mitigate N-losses.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:arable farming, catch crop, nitrate leaching, nitrous oxide emission
Subjects: Soil > Soil quality
Crop husbandry > Composting and manuring
Soil > Nutrient turnover
Environmental aspects > Air and water emissions
Research affiliation: Germany > Universität Kiel > Department of Crop Production and Plant Breeding
International Conferences > 2017: Scientific Conference German Speaking Countries > Soil fertility
Deposited By: Hasreiter, Anna
ID Code:31876
Deposited On:04 Jul 2017 17:21
Last Modified:04 Jul 2017 17:21
Document Language:German/Deutsch
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Dieser Beitrag ist im Tagungsband der 14. Wissenschaftstagung erschienen.
S. Wolfrum, H. Heuwinkel, H.J. Reents, u.a. (Hrsg.) (2017): Ökologischen Landbau weiterdenken - Verantwortung übernehmen - Vertrauen stärken. Beiträge der 14. Wissenschaftstagung Ökologischer Landbau, Freising-Weihenstephan, 7.-10. März 2017
Verlag Dr. Köster, Berlin

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