Download N2O emissions from nitrogen fertilisers – Final report for EF1 relativity trial

New Zealand applies a 1% default emissions factor (EF1) for non‑urea fertilisers and 0.59% for urea. This MPI-funded study undertaken by AgResearch compared EF1 for urea, ammonium sulphate (AS) and diammonium phosphate (DAP). Results indicated that EF1 for AS and DAP are not significantly different and were lower than the default value, implying current 1% values for AS and DAP likely overestimate emissions. Further regional trials across wider conditions are recommended.

Keywords: EF1, fertiliser, non-urea, urea, ammonium sulphate, diammonium phosphate, nitrous oxide