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Table 6 Study site specific mean WOSR yield, mean measured direct N2O emissions in the -NI treatments, indirect N2O emissions calculated with GNOC, direct N2O emission calculated with GNOC, total GHG emissions either based on measured or calculated direct N2O emissions, default values (EU-RED-II, annex V: EC 2018) for maximum GHG emissions for 50%, 60%, or 65% CO2 savings. Calculations according to the JRC (2019) recommendations assuming NH4+–N accounting for 50% of the total digestate N or based on measured NH4+–N accounting for 57% of the total N

From: Nitrification inhibitors reduce N2O emissions induced by application of biogas digestate to oilseed rape

Study site Berge Dedelow Ihinger Hof Hohenschulen Merbitz
Yield [Mg ha−1 yr−1] 3.19 5.23 3.77 4.43 3.92
Direct emissions, measured values [kg N2O–N ha−1] 0.51 1.14 0.96 1.47 2.80
Direct emissions, measured values [g CO2eq MJ−1] 3.04 4.15 4.85 6.32 13.60
50% NH4+-N according to JRC (2019)
Σ Indirect emissions according to GNOC [kg N2O–N ha−1] 0.26 0.26 0.73 0.76 0.26
Σ Direct emissions according to GNOC [kg N2O-N ha−1] 1.72 2.76 1.69 2.90 1.70
Total from N2O based on GNOC [g CO2eq MJ−1] 6.86 6.37 7.07 9.11 5.51
Total CO2eq based on GNOC and JRC defaults [g CO2eq MJ−1] 11.99 11.50 12.24 14.24 10.64
Total CO2eq based on measured direct N2O emissions [g CO2eqMJ−1] 4.56 5.07 8.52 9.58 14.83
57% NH4+-N based on measured NH4+ concentrations
Σ Indirect emissions according to GNOC [kg N2O–N ha−1] 0.29 0.29 0.80 0.80 0.29
Σ Direct emissions according to GNOC [kg N2O-N ha−1] 1.91 3.06 1.85 3.25 1.86
Total from N2O based on GNOC [g CO2eq MJ−1] 7.63 7.06 7.75 10.17 6.05
Total CO2eq based on GNOC and JRC defaults [g CO2eq MJ−1] 12.76 12.19 12.88 15.30 11.18
Total CO2eq based on measured direct N2O emissions [g CO2eq MJ−1] 4.77 5.20 8.90 9.91 15.01
Maximum GHG for 50% savings [g CO2eq MJ−1]    29.5   
Maximum GHG for 60% savings [g CO2eq MJ−1]    19.9   
Maximum GHG for 65% savings [g CO2eq MJ−1]    15.2   
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