Reduction of NH3 Emissions from Urea by Long-Term No-Tillage and Stover Mulching with Inhibitors: An Isotopic Field Study in Northeast China

Large nitrogen (N) losses during fertilization in agricultural production may result energy wastage, soil and water contamination, potentially influence crop development. Thus, with the help of a 15N-labeled tracer, we carried out field monitoring analysis NH3 emissions long-term (9-year) conservation tillage agroecosystem Mollisols northeast China, order to determine whether no-tillage regime four levels stover mulching (0%, 33%, 67%, 100%), combined urease nitrification inhibitors, could improve fertilizer utilization efficiency systems by reducing ammonia volatilization. Our results showed that comparison ridge tillage, 100% significantly reduced emission rates cumulative volatilization from 159.67 130.42 g N ha−1 15N-NH3 26% (on average). Furthermore, application inhibitors 1.19 0.98 ha−1. research demonstrate straw can reduce fertilizers. when use these practices further enhance reduction Although is minimally studied Mollisols, findings provide solid foundation for improving efficiency, costs mitigating subsequent environmental pollution.