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采用四元二次通用旋转组合设计，对影响夏谷茬小麦产量形成的密度、氮、磷、钾肥四项关键农艺措施进行了综合研究。结果表明，夏谷茬小麦每公顷产７．５ｔ以上的关键措施与每项措施增产作用的主次顺序是：密度（基本苗）＞磷肥用量＞氮肥用量＞钾肥用量。其最佳农艺组合方案是：基本苗１８７．０５～２６２．９５万／ｈｍ２；每公顷施纯Ｎ１５０—２２５ｋｇ；Ｐ２Ｏ５１１２．５～１６８．７５ｋｇ；Ｋ２Ｏ４１．２５ｋｇ以下。并建立了基本苗、氮、磷、钾肥用量与夏谷茬小麦每公顷产７．５ｔ以上产量关系的数学模型。
A quadruple quadratic universal rotary combination design was used to study the four key agronomic measures of density, nitrogen, phosphorus and potassium fertilizers affecting the yield formation of summer wheat. The results showed that the key measures of yield increase of 7.5t per hectare of summer wheat per hectare and yield increase of each measure were: density (basic seedling)> phosphorus fertilizer> nitrogen fertilizer> potassium fertilizer. The best combination of agronomic programs are: basic seed 187.05 ~ 2629500 / hm2; applied per hectare N150-225kg; P2O5112.5 ~ 168.75kg; K2O41.25kg the following. The mathematical model of the relationship between the basic seedling, nitrogen, phosphorus and potash fertilizer application and yield above 7.5t per hectare of summer wheat was established.