Study on role of controlled release fertilizer in increasing the efficiency of nitrogen utilization and rice yield
Field experiment was conducted in paddy soil to determine therelationship between N release from controlled release fertilizer and N uptake by rice plants . N release rate of controlled release fertilizer was higher during the early growing period of rice, but gradually decreased with time. The cumulative N release reached about 80% of the total N content of fertilizer at around 70 day after application or when cumulative air temperature had reached about 2000℃. Nitrogen uptake from the fertilizer followed a cubic curve. Therefore, the fertilizer can meet the N requirements of two-line system late hybrid rice throughout the whole growing period. There were lower N concentrations of the water and hardly any algae observed in the plots where controlled release fertilizer applied. Higher urea N and ammonium N concentration of the water in the paddy field after urea applied indicates the greater N losses from NH3 volatilization and denitrification. As high as 72.3% in late rice of fertilize r N were recovered by the rice plant at harvest (grain+straw) with the 70 day type controlled release fertilizer. Controlled release fertilizer increased efficiency of nitrogen use and minimized environmental pollution.
controlled release fertilizernitrogen content in water of paddyfieldnitrogen recoveryincrease yield efficiency
国家科技期刊平台
NSTL
万方数据
维普
