Influence of urease and nitrification inhibitors on N-use efficiency and NH₃ and N₂O emissions when fertilizing with ammonium sulphate urea

• Use of urease and nitrification inhibitors makes a substantial contribution to reducing ammonia and nitrous oxide emissions. • Emission factors determined for ammonia and nitrous oxide emissions were mostly far below the standard values according to the IPCC and EMEP. • No evidence of increased nitrate leaching risk or ecotoxicological effects in drainage water and soil. • Only marginal effects on N-use efficiency and yields, but savings in effort and time due to a double-inhibited fertilizer variant.