氮肥运筹对水稻产量和氮素吸收利用的影响

通过调查安庆市主要稻田氮肥利用和水稻的需肥特性，研究了氮肥不同施用量对水稻产量和农学利用率、氮肥运筹对水稻产量形成和氮素吸收利用的影响。结果表明：水稻氮肥前、中后期施用比例在（4～6）：（4～6）之间能形成适宜的穗数和穗粒数，有利于水稻高产和提高氮肥利用率。

Effect of N Fertilizer Management on Rice Yield and N Element's Absorption and Utilization

The N fertilizer was the important factor to affect rice yield and quality. On the basis of the investigation about N fertilizer utilization and fertilizer requirement character of main paddy in Anqing City, the effect of different N fertilization on rice yield and N element agronomic utilization rate, that of N fertilizer management on rice yield component and N element absorption and utilization were conducted. The result showed that the ratio of N fertilization in early and middlelate period ranged from （4 - 6） to （4 - 6 ） could get the optimum spikes and the number of grains per spike, and it could improve the rice yield and N fertilizer utilization.