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在宁夏采用“四元二次通用回归旋转组合设计”布置试验，对影响大豆产量的密度、尿素、磷酸二铵、氯化钾四项因素进行了综合研究，建立了大豆产量回归目标性状与参试因素的函数模型，利用模型分析了参试因素对产量影响的效应。通过众多的品种筛选淘汰，确立了以理想株型，单位面积粒数多，百粒重高的黑农３３号品种与此“数模”匹配的高产配套栽培新技术。
In Ningxia, “quadruple quadratic general regression rotary combination design” layout experiment was conducted to study the factors affecting the yield of soybean density, urea, diammonium phosphate, potassium chloride four factors were studied to establish a return of soybean yield target traits and ginseng The function model of the test factor is used to analyze the effect of the test factor on the yield. Through screening and elimination of many breeds, a new high-yielding cultivation technique matched with this “digital-analogue” was established with ideal plant type, large number of grain per unit area, and 100-grain weight.