本文就两种不同种植方式玉米不同氮肥用量的产量效应、玉米的氮肥利用率和生产率进行研究,研究表明,移栽玉米的氮肥利用率和生产率都比直播玉米的高,玉米产量和施氮量以线性加平台模型为最优,通过线性加平台得到祥云移栽玉米的最佳施氮量为250 kg/hm²,沾益直播玉米最佳施氮量为190 kg/hm²,表明在现有的生产力水平下,通过适当的模型选择,氮肥用量可以减少而不致于影响产量的下降,从而减少由于过量施用氮肥带来的环境负效应。

Corn under two different planting patterns was studied for optimal nitrogen fertilizer rate.The results showed that the linear plus plateau model can simulate the relation between corn yield and nitrogen fertilizer rate well.The optimal nitrogen fertilizer rate for transplanting corn and direct seeding corn is 250 kg/hm² and 190 kg/hm² respectively,and through the properly selected model nitrogen rate can be reduced and corn yield not affected.

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