摘要： 通过设计氮（N）、钾（K）二因素四水平的试验处理，利用分段函数量化分析了在中高肥力壤土条件下小麦N肥和K肥相互效应的定量关系。研究结果表明，N肥和K肥的施用量对速效养分的释放有明显的相互促进作用，在不同土层深度、不同施肥区间，这种相互作用强度有差异，0~20cm土层大大强于20~40cm土层。在0~20cm耕层中，当纯N用量超过300kg/hm²，在300~450kg/hm²区间内，随着N肥的增加，土壤速效K释放快速增强；当K肥（K₂O）用量超过150kg/hm²，在150~225kg/hm²这一区间内，随着K肥的增加，对土壤硝态氮（NO₃^-_N）释放的促进作用快速增强。

关键词: 小麦, 氮肥, 钾肥, 效应

Abstract: According designing field experiment of two factors and four levels for nitrogen(N) and potassium(K) in winter wheat,this paper analyzed the effect relationship between N and K fertilization in winter wheat in middle-high fertilizer loamy soil environment by the method of piecewise analytic function.The result indicated that the application of N and K are of obviously promotion effect for the releases of available N and available K,and the intensity of the effects are of differences in different soil profiles depth and different fertilization ranges.in 0-20cm depth cultivable soil profile layer.In depth of 0-20cm is larger than 20-40cm.In the depth of 0-20cm,in middle-high fertilizer soil,when N rate is over 300kg/hm² the promotion effect of N fertilizer to the release of mineralized K in soil quickly accelerated with the increasing of N rates;when K rate is over 150kg/hm² and in the range of 150-225kg/hm²,the promotion effect of K fertilizer to the release of mineralized N in soil quickly accelerated with the increasing of K rates.

Key words: Winter wheat, Nitrogen fertilizer, Potash fertilizer, Effect

中图分类号: 

• S158.