Combined effects of nitrogen fertilization and biochar on the net global warming potential, greenhouse gas intensity and net ecosystem economic budget in intensive vegetable agriculture in southeastern China

Combined effects of nitrogen (N) fertilization and biochar addition on the net global warming potential (net GWP), greenhouse gas intensity (GHGI) and net ecosystem economic budget (NEEB) were assessed based on year round field measurement. Due to the overdose N fertilization typically in vegetable production, N fertilizer cannot increase vegetable yield nor NEEB any further but to the worse, increase net GWP and GHGI in the intensive vegetable agriculture. To the contrary, biochar amendment can increase both vegetable yield and NEEB while still reduce the net GWP and GHGI in the intensive vegetable agriculture.280