１９９０年～１９９５年在河南省沙区进行多点肥料田间试验，采用正交旋转设计和单形重心设计，探讨冬小麦的氮肥效益与降水量、土壤有机质含量、有机肥和磷肥施用量的关系以及氮肥的施肥期结构。研究表明，冬小麦对氮肥的边际效益随施肥量增加而减小，在其它因子为中等条件时，最高产量和最大肥料经济效益的施氮量分别为２６８ｋｇ／ｈｍ２和２１３ｋｇ／ｈｍ２，相应产量分别为４５７５ｋｇ／ｈｍ和４５５６ｋｇ／ｈｍ２。氮肥的边际效益随着降水量和土壤有机质含量的增加而减少，氮肥投入应向降雨量少、土壤肥力瘠薄的地区倾钭；氮肥的边际效益随着磷肥和有机肥投入量增加而增大，表明氮磷配合以及有机肥和无机肥配合是实现沙区小麦增产的关键。研究结果还表明，在有机肥和磷肥作底肥的基础上，不同生育期氮肥的优化分配比例应为越冬肥和拔节肥（或孕穗肥）各占１／２或底肥、越冬肥和拔节肥（或孕穗肥）各占１／３，其产量可达４９３２ｋｇ／ｈｍ２～５５３０ｋｇ／ｈｍ２。 In 1990 ~ 1995 in the sand area of ​​Henan Province for more fertilizer field experiments using orthogonal rotation design and single centroid design to discuss the benefits of winter wheat nitrogen and precipitation, soil organic matter content, the relationship between organic manure and phosphorus application rate and Nitrogen fertilization period structure. The results showed that the marginal benefit of nitrogen fertilizer to winter wheat decreased with the increase of fertilizer application. When the other factors were medium, the nitrogen application rates of maximum yield and maximum fertilizer economic efficiency were 268 kg / hm2 and 213 kg / hm2, respectively, and the corresponding yields were 4575 kg / hm and 4556 kg / hm2. The marginal benefit of nitrogen fertilizer decreased with the increase of precipitation and soil organic matter content. The input of nitrogen fertilizer should be tilted to areas with less rainfall and infertile soil fertility. The marginal benefit of nitrogen fertilizer increased with the input of phosphate and organic fertilizers, It is indicated that the combination of N and P as well as the combination of organic and inorganic fertilizers is the key to increase wheat yield in sandy area. The results also showed that on the basis of organic fertilizer and phosphate fertilizer as base fertilizer, the optimum proportion of nitrogen fertilizer in different growth stages should be the proportion of overwintering and jointing fertilizer (or booting spike) or 1/2 of basal, overwintering and jointing fertilizer Or booting fertilizer) each accounted for 1/3, its output up to 4932kg / hm2 ~ 5530kg / hm2.