豫北平原中肥区小麦高产经济用肥分析

The Analysis of wheat Economic Fertilizer Quantities in the Middle Fertility Zone of the North plain of Henan Province

根据对豫北平原中肥区施用氮磷的经济用肥分析、小麦对肥料的效应及施肥投资,确定了最大利润施肥量(施肥上限)和最大利润率施肥量(施肥下限).依氮磷二元肥料效应,在施肥投资不能满足施肥上限而高于施肥下限时,可根据氮磷配合效应方程、肥料价格、种植面积和总投资来确定最优利润施肥量.

In the middle fertility zone of the north plain of Henan province, the useing fertilizer quantities of maximum profit and maximum profit rate (the highest and the lowest limit quaatities of applying fertilizer) are determined on the basis of economic analysis of useing nitrogen and phosphate fertilizers, the effect of increasing wheat yield owing to apply the fertilizers and the fertilizer investions. According to N and P dual fertilizer effect, when fertilizer investion is not satisfied with the highest Limit quantity of applying fertilizer but it is higher than the lowest limit quantity of applying fertilizer, the useing fertilizer quantity of the best profit is determined on the basis of the effective equation of combining N and P fertilizers, fertilizer prices, planting area and total investion.