Efficacy of four nitrification inhibitors for the mitigation of nitrous oxide emissions under different soil temperature and moisture ^#

Background Nitrification inhibitors (NI) may be used to inhibit nitrous oxide (N2O) emissions from agricultural soils, but their efficacy could strongly affected by soil temperature and moisture. Aims This study investigated how different NI behave in a sandy under variable moisture levels, which currently remains unclear. Methods Efficacies of four [dicyandiamide (DCD), 3,4-dimethylpyrazole phosphate (DMPP), nitrogenous mineral fertilizers containing the DMPP ammonium stabilizer (ENTEC) active ingredients: 3.00–3.25% 1,2,4-triazole 1.50–1.65% 3-methylpyrazole (PIADIN)] were an incubation experiment two temperatures (15 25°C) levels [60% 80% water-holding capacity (WH)] for 60 days soil. The received 0.5 g NH4+-N kg−1 applied at 5% N. Total N2O calculated based on gas samples collected throughout period. Results Increasing 15 25°C decreased 73–191% while increasing 60% WHC caused 109–251% increase emissions. ENTEC followed DCD least effective reduce all combinations. Depending upon moisture, PIADIN inhibited 85–100% At 15°C, both almost completely 25°C, 88%, that ranged 86% 98%. Increased content improved NI. Conclusions Overall, more than temperatures. was most inhibitor, inhibiting 15–25°C up this soil, is therefore recommended use lands. concentration contained insufficient affect nitrification