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通过对天津市不同地区及不同产量水平下的冬小麦施肥现状和所存在问题的调查结果，采用Ｄ－饱和设计，并应用计算机模拟在全市有代表性的土壤类型上的田间及反馈试验，得出了冬小麦产量与氮肥、磷肥施用量及播期、播量的回归方程，并列举了冬小麦取得最佳经济效益的施肥量及与之相配合的栽培措施。
Based on the survey results of the fertilization status and existing problems of winter wheat in different regions and different production levels in Tianjin, the D-saturated design was used and the field experiments and feedback tests on representative soil types in the city were conducted by computer. The regression equation of winter wheat yield and nitrogen and phosphorus application rate, sowing date and sowing rate was listed. The best economic benefit of winter wheat and its corresponding cultivation measures were listed.