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采用４因素二次饱和Ｄ最优设计，通过微机模拟计算，建立了大豆产量与大豆专用肥中氮、磷、钾、褐煤等主要成分用量的数学模型。对参试因素及其产量进行了较系统的分析，获得了最高产量施肥量；筛选出大豆产量１２００１８００ｋｇ／ｈｍ２时，以１５０ｋｇ／ｈｍ２为间距的５组专用肥主要成分优化组合方案；当大豆产量≥１８００ｋｇ／ｈｍ２时，专用肥中主要成分最佳用量为：氮肥（Ｎ）３８９５８８２３ｋｇ／ｈｍ２，磷（Ｐ２Ｏ５）为４７７６１０６２５ｋｇ／ｈｍ２，钾（Ｋ２Ｏ）为１４０４４５１７ｋｇ／ｈｍ２，褐煤为１５９０５３１８６０ｋｇ／ｈｍ２。试验结果为大豆专用肥配方提供了数量化指标
Based on the quadratic saturation Dthe optimum design with 4 factors, the mathematical model of the main components such as nitrogen, phosphorus, potassium and lignite in soybean yield and soybean special fertilizer was established by computer simulation. The test factors and yield were systematically analyzed and the highest yield of fertilizers was obtained. When the soybean yield was 12001800kg / hm2, the optimal combinations of main components of five special fertilizers with the spacing of 150kg / hm2 were selected. When soybean yield ≥1800kg / hm2, the optimum dosage of the main components in special fertilizer is: 38.9578.23kg / hm2 of nitrogen fertilizer, 47.76106.25kg / hm2 of phosphorus and 14.0445 of potassium. 17kg / hm2, lignite is 1590531860kg / hm2. The test results provide a quantitative index for soybean fertilizer formula