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试验结果表明,杂交水稻亩产500公斤,早稻需要的氮素营养比常规稻多,晚稻则相反,杂交早稻和杂交晚稻都以生育中期为吸氮最多的时期,其吸氮量占全生育期吸氮总量的一半以上,土壤供氮则相反。氮肥不同用量试验中,氮肥采用“促前控中”施肥法,其利用率平均为30.84％。氮肥不同施用方法试验中。采用“稳前攻中”施肥法,早稻的氮肥利用率平均为41.03％,较“促前控中”施肥法提高14.07％;晚稻平均为67.07％。较“促前控中”法提高29.46％。在配施磷钾肥试验中,氮磷配施,氮肥利用率为38.91％,较氮肥单施仅提高9.47％;氮钾配施和氮磷钾配施,氮肥利用率分别为46.92％和58.08％,较氮肥单施分别提高17.75％和28.91％。“稳前攻中”施肥法和氮钾及氮磷钾配施均有提高氮肥利用率的良好效果。
The results showed that the yield of hybrid rice was 500 kg per mu, the nitrogen requirement of early rice was higher than that of conventional rice, but the late hybrid rice was the opposite. Both hybrid early hybrid rice and hybrid late rice had the highest nitrogen uptake during mid-growth stage, More than half the total amount of nitrogen, the opposite of soil nitrogen supply. In the experiment of different dosage of nitrogen fertilizer, the nitrogen fertilizer adopted the method of “promoting pre-control” and the utilization rate was 30.84% on average. Different application methods of nitrogen fertilizer in the experiment. The “stable before attack” fertilization method, early rice nitrogen utilization rate average 41.03%, “ahead of the pre-control” fertilization method increased 14.07%; late rice average 67.07%. This is 29.46% higher than that of “promoting pre-departure control.” In the application of P and K fertilizers, nitrogen and phosphorus application rate was 38.91%, which was only 9.47% higher than that of nitrogenous fertilizer application. Nitrogen and potassium application and N, P fertilizer application rate were 46.92% and 58.08% , Respectively, compared with nitrogen fertilizer increased by 17.75% and 28.91%. “Steady attack before” fertilization method and nitrogen and potassium and nitrogen, phosphorus and potassium fertilizers all have good effect of increasing nitrogen use efficiency.