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在辽宁省西部建平县马场乡和张家营子乡的栗褐土区,采用最优回归设计设置玉米氮磷复因素田间试验。根据试验结果配置了二元二次效应方程,计算出两个乡在不同边际利润下的玉米氮磷最佳经济用量和配比。1987年在这两个乡的一千余亩玉米田上推荐 N 用量6～7公斤/亩,P_2O_5用量5～6公斤/亩的肥料配方,玉米平均增产15.1%,每亩平均获利润20.7元,达到了预期的目标。
In the field of chestnut cinnamon in Machang Township of Jianping County and Zhangjiayingzi Township in the west of Liaoning Province, the optimal regression design was used to set up a field experiment of nitrogen and phosphorus complex maize. Based on the experimental results, a binary quadratic equation was set up to calculate the optimal economic use and proportion of nitrogen and phosphorus in maize under two different marginal profits. In 1987, more than one thousand mu of cornfields in these two townships were recommended to use a fertilizer formula of 6 to 7 kg / mu N and 5 to 6 kg / mu P_2O_5, yielding an average yield of 15.1% for maize and an average profit of 20.7 yuan per mu, Achieved the desired goal.