Der kurzfristige Einfluss von drei Zwischenfruchtarten und zwei verschiedenen Bodenbearbeitungen auf Frühjahrs-NO3-N des Bodens und Ertrag der Hauptfrucht Hafer

Summary

Reduced tillage and green manures may be capable to further improve organic crop production systems. However, it is presumed that under organic farming conditions a lower intensity of soil tillage may reduce nitrogen (N) availability and increase weed pressure. A combination of reduced tillage with an appropriate green manure species could answer these problems.
The results of a repeated one year trial on the research farm of University of Kassel, regarding the effects of three different green manure species (Sinapis alba, Trifolium resupinatum and Vicia sativa) and conventional (plough) vs. reduced tillage (2012 chisel, 2013 disc harrow) on N availability in spring and on the yield of main crop oat are the topic of this paper.
In both years, in the reduced tillage systems the V. sativa treatments resulted in N levels as well as oat yields on a similar level like the best plough treatments. Yield differences between the different green manure treatments in the plough system were generally low. They were more pronounced between the green manure treatments in the reduced tillage systems. Reduced tillage systems therefore seem more dependent on an adequate green manure species.