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１９９７ ～１９９８ 年北京农学院农学试验站进行的多因素二次通用旋转回归设计小麦栽培结果表明：试验因素对小麦产量的效应顺序为：氮肥＞ 播期＞ 磷肥＞ 密度＞ 追氮次数。其中氮肥、磷肥、追氮次数效应方向为正，播期、密度效应方向为负，各因素的二次回归系数均显著，氮肥×播期、氮肥×磷肥互作均在不同程度显著。
The results of wheat cultivation showed that the order of the effect of experimental factors on wheat yield was: nitrogen fertilizer> sowing date> phosphate fertilizer> density> number of topdressing nitrogen. Among them, the direction of nitrogen fertilizer, nitrogen fertilizer frequency was positive, and the sowing date and density effect direction was negative. The quadratic regression coefficients of all factors were significant. The interaction of nitrogen fertilizer, sowing date and nitrogen fertilizer and phosphorus fertilizer were all significant in different degrees.