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利用4因子5水平二次回归正交设计，在肥力较低的土壤上，研究甜菜根产量与磷、氮、钾、锌四种肥料的关系，建立数学模型。结果表明，四种肥料对甜菜根的产量反应显著。钾肥和锌肥的施用，有利于甜菜对磷肥和氮肥的利用。各因子对产量的作用效应依次为磷＞钾＞氮＞锌，交互效应的大小依次为磷钾＞磷锌＞氮锌＞磷氮＞氮钾＞钾锌。高产优化方案是磷肥18kg／亩、氮肥18kg／亩、钾肥9kg／亩。锌肥1．5kg／亩，最高产量为2598kg／亩。
The quadratic regression quadratic design with four factors and five levels was used to study the relationship between beetroot yield and phosphorus, nitrogen, potassium and zinc fertilizers and to establish a mathematical model in the lower fertility soil. The results showed that the four kinds of fertilizers responded significantly to the yield of beet. The application of potash fertilizer and zinc fertilizer is beneficial to the utilization of phosphate fertilizer and nitrogen fertilizer in sugar beet. The effect of each factor on yield was in the order of phosphorus> potassium> nitrogen> zinc. The order of interaction effect was phosphorus and potassium> phosphorus and zinc> nitrogen and zinc> phosphorus and nitrogen> nitrogen and potassium> potassium and zinc. High yield optimization program is phosphate fertilizer 18kg / mu, nitrogen fertilizer 18kg / mu, potash 9kg / mu. Zinc fertilizer 1.5kg / mu, the highest output of 2598kg / mu.