不同土壤肥力下玉米氮、磷、钾肥最佳用量的探讨

Preliminary study on the optimal application of N,P and K in maize under different soil fertility

为给玉米合理施肥提供科学依据,采用"3414"回归设计模型,研究了不同土壤肥力下玉米产量与氮、磷、钾养分投入量间的数量关系及土壤养分的供应潜力。结果初步建立了高、中、低肥力土壤上的玉米产量与氮、磷、钾肥的效应方程,求其最佳施肥量:高肥力.N 58.4 kg/hm^2.P_2O_5 194.3 kg/hm^2,K_2O 200.4 kg/hm^2;中肥力,N 187.9 kg/hm^2,P_2O_5 170.3 kg/hm^2.K_2O 173.2 kg/hm^2;低肥力,N 293.4 kg/hm^2,P_2O_5 214.8 kg/hm^2.K_2O 183.2 kg/hm^2。

In order to provide scientific fertilizer basis for maize, the ＂3414＂ regression design model was applied to study the relations between yield of maize and application amounts of N, P and K, and the supply potential of soil nutrient under different soil fertility in Zhuozhou, Hebei Province. The equations of fertilizer function under such three levels as high, middle and low were preliminarily estimated. Results show that the amount of optimal application of fertilizers in high soil fertility was N 58.4 kg/hm^2 , P2O5 194.3 kg/hm^2 and K2O 200.4 kg/hm^2 ; in medium level, N 187.9 kg/ hm^2 , P2O5 170.3 kg/hm^2 and K20 173.2 kg/hm^2 ; in low level, N 293.4 kg/hm^2 , P2O5 214.8 kg/ hm^2 and K20 183.2 kg/hm^2.