Effects of Reduced Nitrogen Fertilizer Rates on Its Fate in Maize Fields in Mollisols in Northeast China: A 15N Tracing Study

A large amount of nitrogen fertilizer is applied in maize planting Northeast China, but the recovery rate low, causing a series water and soil environmental problems farmland areas. Thus, based on isotope tracing technology combining field plot test with an situ microzone test, we carried out experiment under reduced conditions. Five different application levels were set: conventional (N1: 250 kg ha−1), 10%-reduced (N-10: 225 20%-reduced (N-20: 200 30%-reduced (N-30: 175 nitrogen-free (N0: 0 ha−1) treatments. Yield, accumulation fates studied. The results showed that reducing rates improved basal topdressing. Specifically, was 19.81–26.20%, topdressing 40.24–47.71%. loss 19.96–39.18%, reduction decreased fertilizer. ranged from 36.46 to 41.76%. residual 0–100 cm layer 41.01–53.84% 12.22–22.30%, respectively. As decreased, corn yield decreased. Reductions 20% 30% had negative influence plant accumulation. This revealed effect fate fertilizer, China. In could increase reduce amounts risk pollution, yield.