湖北省小麦施氮效果及氮肥利用率研究

Study on Nitrogen Effect and Nitrogen Use Efficiency of Wheat in Hubei Province

为探讨湖北省小麦施氮效应及氮肥利用率现状,在小麦主产县(市、区)进行了不同氮肥用量的70组田间肥效试验。结果表明,小麦施氮增产效果显著,施氮比对照平均提高产量3 159 kg/hm2,增产率达到84.6%;施氮平均经济效益增加3 866元/hm2,产投比5.3;氮素偏生产力和农学效率分别为31.3 kg/kg和14.4 kg/kg。根据直线加平台模型,确定湖北省小麦氮肥最佳用量平均为158 kg/hm2。

Seventy field experiments were carried out to study the response to nitrogen（N） effect and N use efficiency of wheat in Hubei province.The results showed that N application both increased wheat yield and profit significantly.Compared with control treatment（without N）,the average yield increment in N application treatments was 3 159 kg/hm2 and the increment rate was 84.6 percent.Average net profit of N application was 3 866 Yuan/hm2 and the value to cost ratio（VCR） was 5.3.The partial factor productivity of applied N（PFPN） and agronomic N use efficiency（AEN） was 31.3 kg/kg and 14.4 kg/kg respectively.According to linear plus platform model,the average optimum N application rate was 158 kg/hm2 for wheat in Hubei province.