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采用三因素二次饱和Ｄ—最优设计，建立了麦套花生Ｎ、Ｐ、Ｋ施肥与花生产量间的数学模型。由模型可得：（１）Ｎ、Ｐ、Ｋ三种肥料对麦套花生产量作用显著，且互作间存在较大的交互效应，因此，Ｎ、Ｐ、Ｋ需配合使用。（２）公顷产量４５００～５２５０ｋｇ的优化施肥方案为：每公顷施Ｎ１０９．５～１４７ｋｇ，Ｐ２Ｏ５１３３．５～１８６ｋｇ，Ｋ２Ｏ２４３～３４８ｋｇ；最优组合为：每公顷施Ｎ１３９．６ｋｇ，Ｐ２Ｏ５１７４．３ｋｇ和Ｋ２Ｏ３２３．３ｋｇ，最高产量可达５２６０ｋｇ／ｈｍ２。
The mathematical model of wheat N, P, K fertilization and peanut yield was established using three-factor secondary saturation D-optimal design. The model can be obtained: (1) N, P, K three kinds of fertilizer on the wheat peanut yield significant role, and there is a large interaction between the interaction, therefore, N, P, K should be used in conjunction. (2) Optimum fertilization program with output of 4500-5250 kg ha was as follows: N109.5 ~ 147kg, P2O5133 ~ 186kg and K2O243 ~ 348kg per hectare; the optimal combination was N139.6kg per hectare, P1717.5kg and K2O323 .3kg, the highest output up to 5260kg / hm2.