磷氮钾锌四种肥料对甜菜根产量反应的数学模型

Mathematical Model of Applying N,P,K and Zn Effect on Common Beet Root Yield

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。

Relations between root yieId of common beet (Beta vulgaris L.) and N,P,K, Zn fertilizers on poor soil were studied by regression orthogonal design of 4 factors and 5 levels, and mathematical models were set tip. The result showed that the effect of applying these fertilizers was obvious. Applying of K and Zn was favourable for the utilization of P and N. The effect of each kind fertilizer was P>K>N>Zn, and effect of interaction was PK>PZn> NZn>PN>NK>KZn. The superior plan for high yield was P 18kg/mu, K 9kg/mu and Zn 1. 5kg/mu (1mu= 0. 667ha). The highest yield of common beet was 2598kg/mu.