We can oftain the most optimum amount of fertilizer using in light chernozem to corn 9.6Kg/acre for nitrogen and 7.2Kg/acre for phosphrous (P_2O_5). Mixing ratio is 1:0.745. From yield increasing analysis.

• 根据投入产出边际分析原理；求出玉米在淡黑钙土上化肥最佳用量；氮为9.；6公斤/亩；磷(P_2O_5)为7