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采用正交区组二次回归旋转组合设计，在大田条件下建立了氮、磷、钾不同施肥量对水稻产量的生产函数；按边际分析原理探讨了氮、磷、钾肥对水稻产量的影响。结果表明：氮肥与磷肥之间和氮肥与钾肥之间均存在相互替换关系；得出了最高产量点、最高盈利点和在等产量线上的最低合计成本点的肥料配比，并进行了经济效益分析。
The quadratic regressive rotation combination design of orthogonal block was used to establish the production function of different fertilizers of nitrogen, phosphorus and potassium on rice yield under field conditions. The effects of nitrogen, phosphorus and potassium fertilizers on the yield of rice were discussed based on the principle of marginal analysis. The results showed that there was a reciprocal relationship between nitrogen and phosphate fertilizers and between nitrogen fertilizers and potassium fertilizers. The ratio of fertilizers with the highest yield point, the highest profit point and the lowest total cost point on the equal yield line was obtained and the economic Benefit Analysis.