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采用三因子二次通用旋转组合设计，对氮磷钾施肥水平与莴苣生育指标和产量及氮磷钾利用率建立数学模型。分析结果表明，氮磷钾施肥水平对生育指标皆有影响，并存在着氮磷和氮钾正交互作用。本试验条件下，要获得１００克／株以上的产量，氮磷钾配比应为１∶０．５∶１．１。
A three-factor quadratic universal rotary combination design was used to establish a mathematical model of nitrogen, phosphorus and potassium fertilization and the fertility index and yield of lettuce and the utilization of NPK. The results showed that the NPK fertilization had an impact on the fertility index, and the orthogonal interaction between N and P and N and K existed. Under the test conditions, to obtain a yield of more than 100 g / plant, the NPK ratio should be 1: 0.5: 1.1.