Effect of catch crops on N dynamics and following crops in organic farming

摘要: Green manure catch crops promote the sustainability of agricultural systems by reducing soil erodibility and nutrient uptake transfer to following main crops. This effect efficiently reduces risk nitrate leaching. Biological nitrogen fixation legume is an additional benefit, mainly in organic farming. Such may, however, reduce from increase Additionally, under drought conditions, their extra water consumption may outweigh beneficial effects. To determine best crop management stockless farming dry, Pannonian site conditions eastern Austria, four treatments were compared 2002 2004: (1) legumes: field pea, common vetch chickling vetch, (2) non-legumes: phacelia, oil radish turnip, (3) a non-legume mixture (all mentioned components), (4) bare fallow control. Our results show that biomass N yield, biological fixation, about 4 times higher moderately dry than summer autumn 2004. In 2002, legume/non-legume had highest yield fixation. Both non-legumes more efficient legumes (+32 kg ha−1); both inorganic contents −45 ha−1 concentrations solution −20 mg L−. These findings combined positive effects legumes. 2004, did not differ except for above-mentioned on contents. The only pre-crop was with spring barley grain matter +0.6 Mg DM +17 2005. never adversely affected