水稻免耕抛秧栽培在不同施N量的情况下,对穗实粒数影响最大,其次为亩有效穗,对千粒重的影响最小。低N肥区低产原因为穗实粒数少,中N肥区获取高产量原因为每穗实粒比低N肥和高N肥区多。本文对水稻免耕抛秧栽培不同施N量植株的生长特点及其原因进行了初步的分析。 Under no-tillage and throwing-seedling cultivation, the effect of N application rate on the number of spike grains was the largest, followed by the effective spike per acre, which had the least effect on 1000-grain weight. The reason for the low yield of low N fertilizer area is that the number of spike grains is small, and the reason for the high yield of medium N fertilizer area is that there are more grains per spike than low N fertilizer and high N fertilizer. In this paper, the growth characteristics of non-tillage and throwing seedlings of different N application rates and their causes were analyzed.