title: Biogas in organic agriculture: Effects on yields, nutrient uptake and environmental parameters of the cropping system
creator: Möller, Kurt
creator: Stinner, Walter
creator: Leithold, Günter
subject:  Air and water emissions
subject:  Composting and manuring
description: System effects of biogas fermentation in organic cropping systems with and without livestock (dairy farming) were investigated from 2002-2005. In both systems no differences in yields and nutrient uptake were detected in the legume crops. In the livestock-system non legume crops of the slurry system had no higher yields but a higher nitrogen uptake (6 %) than the stable manure system. Slurry-fermentation had no effect on yields and nitrogen uptake. The inclusion of crop residues in the fermentation system increased the nitrogen uptake about by 10 % and reduced the nitrate leaching potential by ca. 10 %. The inclusion of external substrates lead to a further increase in nitrogen yield of 10 %, but to no significant increase in dry matter yields. Fermentation had no effects on P-availability of manures. In the stockless system fermentation of clover grass, straw and catch crops increased yields and nitrogen content of winter wheat by ca. 10 %, combined with a significant decrease in nitrate leaching potential (10 %) and in emissions of nitrous oxide (ca. 40 %).
date: 2006
type: Conference paper, poster, etc. 
type: NonPeerReviewed
format: source
identifier: http://orgprints.org/7223/1/kurt_moeller_biogas.doc
identifier: Möller, Kurt; Stinner, Walter and Leithold, Günter (2006) Biogas in organic agriculture: Effects on yields, nutrient uptake and environmental parameters of the cropping system. Joint Organic Congress, Odense, Denmark, May 30-31, 2006.
relation: http://orgprints.org/7223/