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Friedel, Jürgen K.; Kasper, Martina; Schmid, Harald; Hülsbergen, Kurt-Jürgen and Freyer, Bernhard (2014) NEED FOR PHOSPHORUS INPUT IN AUSTRIAN ORGANIC FARMING? [Ist eine Phosphorzufuhr auf ökologisch wirtschaftenden österreichischen Betrieben erforderlich?] In: Rahmann, G. and Aksoy, U. (Eds.) Building Organic Bridges, Johann Heinrich von Thünen-Institut, Braunschweig, Germany, 1, Thuenen Report, no. 20, pp. 37-40.

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On organic farms, phosphorus (P) balances are often negative because no or little P is imported into the farms. Negative P balances may deteriorate P availability over time. We calculated P balances of the main farm production types in organic farming for the main Austrian production areas. Using data from various data bases and expert knowledge, we applied the sustainability assessment tool REPRO for calculations. The P balances were balanced to slightly deficient for organic forage dairy farms, cash crop farms and permanent crop farms, and slightly to highly surplus on organic refinement, pig producing farms. Deficient P balances, mainly on organic cash crop farms, call for P input especially on farms where available P fractions in the soil are very low and / or P stocks in the soils are low, i.e. on sandy soils and on some calcareous soils. Possibilities for enhancing P mobilisation are discussed. There is an urgent need to close nutrient cycles on the farm and regional scale and to substitute P from rock phosphate reserves by alternative P fertilisers also in organic farming.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:phosphorous, balance, farm type, sustainability, fertilization
Agrovoc keywords:
Englishfarm typeUNSPECIFIED
Subjects: Crop husbandry > Composting and manuring
Food systems > Recycling, balancing and resource management
Soil > Nutrient turnover
Environmental aspects > Air and water emissions
Research affiliation: European Union > CORE Organic II > IMPROVE-P
Austria > Univ. BOKU Wien > Sustainable Agr. Systems - IfÖL
Austria > Lebensministerium (BMLFUW)
International Conferences > 2014: 18th IFOAM OWC Scientific Track: 4th ISOFAR Scientific Conference
Related Links:https://improve-p.uni-hohenheim.de/
Deposited By: Friedel, Dr. Jürgen K.
ID Code:23853
Deposited On:29 Oct 2014 08:24
Last Modified:29 Oct 2014 08:25
Document Language:English
Refereed:Peer-reviewed and accepted
Additional Publishing Information:urn:nbn:de:gbv:253-201407-dn053621-1

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