吉林春玉米施肥模型的研究

目的]探寻黑土地春玉米的最佳施肥方案。方法]采用二次回归D—最优设计（3414方案）,通过计算机模拟寻优,建立了春玉米产量——施肥量的数学模型,分析了氮（尿素,N46%）、磷（过磷酸钙P2O512%）、钾（硫酸钾,K2O50%）肥的主效应及交互效应与产量的关系、边际产量和最佳施肥量。结果]在该土壤条件下氮、磷、钾肥的施用量分别为180、75、75 kg/hm^2时,种植春玉米可获得最高产量为10 694.28 kg/hm^2。结论]为制定玉米施肥模式、确定合理的施肥分区和优化测土配方及施肥配方提供了依据。

Studies on Fertilization Model for Spring Maize in Jilin Province

Objective] The aim was to explore the optimum fertilizing scheme for spring maize in black soil.Method] An experiment was conducted by means of "3414" regression design.A mathematical model of spring maize yield-fertilizer rate was established by computer simulating optimization.Based on the model,relationship between the yield and the main effect and interaction effect of N,P2O5 and K2O,marginal yield and the optimal fertilizer application were analyzed.Result] Under the experimental conditions,the application rates of N,P2O5 and K2O were 180,75 and 75 kg/hm2,respectively,meanwhile the highest yield of spring maize reached 10 694.28 kg/hm2.Conclusion] The research provides a scientific basis for making fertilization model of spring maize,determining reasonable fertilization division and optimizing soil-testing formula and fertilization formula.