不同氮肥用量水平对水稻生长及产量影响

Effect of Different Amount of N Fertilizer on Rice Growth and Yield

以常规粳稻武运粳24号为材料,在基础地力和前后氮肥运筹比例相同的条件下,研究了不同氮肥施用水平对水稻生长及产量的影响。结果表明:在一定范围内,产量随着氮肥用量增加而增加,但过量施用氮肥,产量反而有所下降。增施氮肥增产效果主要是由于促进了分蘖发生,增加了有效穗数。适量的增施氮肥可增加穗粒数,但随着施氮量的加大,因穗数过多,穗型偏小,穗粒数呈下降的趋势。结实率随着施氮水平的提高而下降。低氮肥的情况下,水稻的粒重较高,氮肥用量达一定水平后,施氮量对粒重的影响不明显。随着氮肥用量的增加,氮肥利用率降低。

The effect of different amount of N fertilizer on rice growth and yield were researched under the condition of same basic land capability and Nitrogen application which use Wuyunjing-24 as test material. The result indicated that yield increased with amount of N fertilizer within limits, but over-fertilization of nitrogen can reduce yield instead. increasing nitrogen fertilizer can accelerat tillering and increase the effective panicles, so it increased the yield. increasing nitrogen fertilizer in proper quantity can increase grain numbers of ears, but excessive application of N fertilizer could generate excessive panicles then lead spike-like shape small, and the grain number per ear indicated a significantdecrease trend. As the N application level is increase there is an decrease in the fruiting rate. The grain weight can increase with lower application rate, when the N fertilizer reached a certain level, it had little effect on grain weight. The N rate was reduced with the increasing of Nitrogen.