针对目前国内利用二元二次肥料效应函数确定最佳经济施肥量的数学方法存在的问题。
The function of binary quadric fertilizer effect has been extensively used in China to determine the optimum economy fertilizing quantity.
以最佳施肥处理N75P200K50的经济效益最好，投入与产出比为1∶2．2，与施肥量最高的处理相比，投入少，产出大，内部收益率为25．96％。
The fertilizer treatment of N75P200K50 also has the best economic benefit with a ratio for input and output of 1 to 2.2 and a NPV of 25.96%.
通过玉米“ 3414 ”试验，测定了石楼县小蒜乡小蒜村种植玉米的最大施肥量与最佳经济施肥量。
The experiment of corn 3414 determines the maximum fertilizing and optimum economic fertilizing of corn planting in Xiaoshuan Village of Shilou County.
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