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在小麦地膜盖栽培中，播期和密度是２个对产量及产量构成影响较大的因子。滁州市１９９７～１９９８年度试验结果表明，江淮地区地膜小麦产量及产量构成诸因子与播期、密度之间，均可建立起二元二次多项式曲面回归方程：ｙ＝ｂ０＋ｂ１ｘ＋ｂ２ｘ２１＋ｂ３ｘ２＋ｂ４ｘ２２＋ｂ５ｘ１ｘ２。解析方程可求得到最高产量时的播期和密度组合，以及产量构成因素指标。
Sowing date and density were the two factors affecting the yield and yield components of wheat in plastic film mulching. The results from 1997 to 1998 in Chuzhou showed that the regression equation of quadratic polynomial surface can be established between the factors of yield and grain yield formation and the sowing date and density in the Jianghuai region: y = b0 + b1x + b2x21 + b3x2 + b4x22 + b5x1x2. Analyze the equation to obtain the sowing date and density combination at the highest yield, as well as the index of yield components.