Nitrogen-Reduction in Intensive Cultivation Improved Nitrogen Fertilizer Utilization Efficiency and Soil Nitrogen Mineralization of Double-Cropped Rice

Under the current rice cropping system, excessive nitrogen application has become a major issue that needs to be changed, and reduction hot research topic in recent years. The use of optimum planting density is becoming common agronomic management system addition reduction, especially under double systems. In this paper, changes yield, nitrogen-use efficiency (NUE) net N mineralization dense with reduced rate (DPRN) were studied. By comparing DPRN high-nitrogen sparse (SPHN), we found population tiller number (tiller per unit area) increased by 9–27% cultivation. Nitrogen accumulation treatment double-cropped was basically stable. NUE significantly higher 1.3–22.7% compared SPHN. partial factor productivity applied (PFPN) than SPHN, an increase 4.3–22.8%. mineralized at different stages, late-season (LSR) greater early-season (ESR). highest stages (DP) N2 (120 kg h?1). conclusion, cultivation could accepted as proper strategy for reducing input, improving promoting soil given conditions.