玉米对氮肥十分敏感 ,影响肥效除生态因素外有三大项 ,即施肥量比、时期和位置。从这三方面在主要土类上开展此项研究 ,结果表明 :适应的量比施肥时期和位置 ,可提高氮肥利用率 ,达到 39 2 0 %～ 5 7 75 % ,比当前的利用率 30 %～ 35 %提高 7 4～ 2 2 7个百分点 ,增产显著。在生产中已广泛应用 ,严防浅施 Corn is very sensitive to nitrogen fertilizer, fertilizer effect in addition to the three major ecological factors, namely, than the amount of fertilizer, period and location. Carrying out this study on the main soil from these three aspects, the results showed that the adaptation rate could be increased from 3920% to 5775% compared to the fertilization period and location, which is 30% more than the current utilization rate ~ 35% increase 7 4 ~ 2 2 7 percentage points, yield significant. Has been widely used in production, to prevent shallow facilities