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历经３ａ设置不同施Ｎ水平试验，结果表明：杂交稻的吸Ｎ量随施Ｎ水平的提高而呈曲线增加，但Ｎ肥回收率和生产干物质及稻谷的效率随施Ｎ水平的提高而降低。干物质积累量、稻谷产量与施Ｎ量呈抛物线型相关。试点施Ｎ１３０～１４４ｋｇ／ｈｍ２可保持较高的Ｎ肥回收率和生产效率，取得最高的产量和经济效益。提出杂交稻主要生育期叶片含Ｎ率的高产诊断指标为分蘖期４．３％～４．５％，苞分化期３．７％～４．１％，齐穗期２．８％～２．９％，黄熟期１．４％～１．５％。
The results showed that the N uptake of hybrid rice increased with the increase of N level, but the N recovery and the efficiency of production of dry matter and rice decreased with the increase of N level . Dry matter accumulation, rice yield and N application rate were parabolic. Pilot application N130 ~ 144kg / hm2 can maintain high N fertilizer recovery and production efficiency, and achieve the highest yield and economic benefits. The high-yield diagnostic indexes of N leaf rate in main growth stage of hybrid rice were 4.3% -4.5% at tillering stage, 3.7% -4.1% at budding stage and 2.8% -2 at heading stage. 9%, yellow ripening 1.4% ~ 1.5%.