Download N2O emission factors (EF1) for fertilisers – Autumn 2024 EF1 trial

Field trials across four New Zealand regions assessed nitrous oxide emission factors (EF1) for urea, ammonium sulphate and diammonium phosphate under representative autumn conditions. EF1 values did not differ significantly and averaged well below the IPCC default of 1%. Based on trials from this study and previous research, current inventory methods may overestimate emissions from AS and DAP and it is recommended that a common EF1 value is used for all three fertilisers.

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