不同肥力和土壤质地条件下麦田氮肥利用率的研究

在不同肥力和质地的土壤上，采用田间小区及水泥池栽培试验进行了麦田氮肥利用率的研究。结果表明，高肥力麦田小麦对土壤氮素的依存率很高，氮肥的利用率较低，在设计施氮量范围内，仅为１９．０％－７．４％；在中高肥力麦田，小麦对土壤氮素的依存率低，氮肥的利用率较高，达５８．８％－３６．９％，在供氮水平相近的不同质地土壤中，小麦对对氮肥的依存率是以重壤〈中壤〈轻壤；氮肥利用率在氮肥用量低时相差不大，随着施氮量的

Studies on Use Efficiency of N Fertilizer in Wheat Field with Different Fertilities and Soil Textures

By methods of field trial and cement-pool cultivation, this paper studied the use efficiencies of N fertilizer in wheat fields with different fertilities and soil textures. The re sults showed that, in high fertility field, the soil N dependant rate of wheat was very high with the use efficiency of N fertilizer being very low, only 19. 0% to 7. 4% in certain scale of fertilizer rates, while in mid-high fertility field, the soil N dependant rate was lower with the use efficien cy of N fertilizer higher (58. 8% to 36. 9%). In soils with different textures and similar N con tents, the soil N dependant rates were in the order of heavy loamymedium loamy>light loamy un der the same rates of N fertilizer applied. With the increase of the rates of N fertilizer applied, the use efficiency of N fertilizer decreased in all the soils tested.