在上等田和中上等田及中迟熟高产良种条件下，通过水稻生长前、中、后期氮素不同施用量和施用方法比较试验，改进水稻施氮技术。结果表明，一季总氮量１７２．５ｋｇ／ｈｍ２，可满足目标产量要求；水稻生长的前、中、后期施氮比例以６∶３∶１产量较高，并能达目标产量；前期分蘖肥以插秧后５～６ｄ适当重施氮肥，插秧后１０～１２ｄ轻施氮肥有利于控制无效分蘖和创造条件施穗肥；中期穗肥分２次施比１次施更有利于培育高产群体和提高穗粒数；后期适当施氮有显著增产效果。 Under the conditions of the upper field, the upper middle field and middle-late-spring high-yielding and middle-late-maturing high-yielding varieties, the nitrogen application techniques of rice were improved by comparing the different nitrogen application rates and application methods before, during and after rice growth. The results showed that the total amount of nitrogen in the first season was 172.5kg / hm2, which could meet the target yield requirements. The ratio of nitrogen fertilization in the early, middle and late stages of rice growth was higher at 6: 3:1 and reached the target yield. After transplanting 5 ~ 6d appropriate nitrogen fertilizer, 10 ~ 12d after transplanting light nitrogen fertilizer is conducive to control of ineffective tillering and create the conditions of panicle fertilizer; medium panicle fertilizer 2 times than 1 times more conducive to cultivate high-yielding population and improve the panicle Grain number; the latter part of the appropriate nitrogen fertilizer increased yield significantly.