Fig. 2.

Management induced cumulative N₂O emissions per cropping season (GC ley – grass-clover, WW – winter wheat, CC – cover crop) and total cumulative emissions of the two year monitoring period. Management induced emissions are assigned to emissions after slurry application and tillage operations (periods see Table S1, Supplement material). Baseline emissions refer to remaining emissions in the respective cropping period . Total two years N₂O emissions are represented by the entire bar and by values displayed on top. Mean cumulative N₂O emissions (n = 8) are displayed per treatment with CT – ploughing, RT – reduced tillage, SL – slurry and MC – manure compost. Significant tillage/fertiliser system effects on total N₂O-N emissions and emissions in each period are shown on the right hand side (ANCOVA, F-test, Level of significance: (*)p < 0.1, *p < 0.05, ** p < 0.01, ns = not significant).