中高肥力壤土小麦氮钾肥相互效应关系定量研究

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,0~20 cm土层大大强于20~40 cm土层。在0~20 cm耕层中,当纯N用量超过300 kg/hm2,在300~450 kg/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150 kg/hm2,在150~225 kg/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。

The Effect Relationship Between Nitrogen and Potash Fertilization for Winter Wheat in Middle-High Fertilizer Loamy Soil

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 0-20 cm depth cultivable soil profile layer.In depth of 0-20 cm is larger than 20-40 cm.In the depth of 0-20 cm,in middle-high fertilizer soil,when N rate is over 300 kg/hm~2 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 150 kg/hm~2 and in the range of 150-225 kg/hm~2,the promotion effect of K fertilizer to the release of mineralized N in soil quickly accelerated with the increasing of K rates.