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采用五因素二次正交旋转组合设计，应用中心变换的统计方法，研究了大方地区小麦不同种植密度和施肥量对产量和蛋白质含量的影响，结果表明，在合理密植、施用氮肥、磷肥、腐殖酸肥的基础上，施用钾肥是提高小麦产量的关键。钾肥与小麦产量关系极显著，呈现开口向上的抛物线，说明土壤缺钾严重。同时，在保证产量的基础上，增施氮肥、磷肥能显著提高小麦的蛋白质含量。试验得到产量大于２００ｋｇ／６６７ｍ２和蛋白质含量大于１４％的９５％置信区间的种植密度和施肥参数。
Using five factors quadratic orthogonal rotation combination design, the statistical method of center transformation was used to study the effects of different planting densities and fertilization amount on yield and protein content in generous area. The results showed that under the conditions of close planting, application of nitrogen fertilizer, Based on the phytonutrient application, the application of potash is the key to increasing wheat yield. The relationship between potash fertilizer and wheat yield is extremely significant, showing a parabola with an upward opening, indicating that the potassium deficiency in the soil is serious. At the same time, on the basis of ensuring yield, increasing nitrogen and phosphate fertilizer can significantly increase the protein content of wheat. Planting density and fertilization parameters were obtained at 95% confidence intervals with yields greater than 200 kg / 667 m2 and protein content greater than 14%.