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中文摘要：
运用双佳值法对小麦／玉米／大豆套作种植模式氮肥周年施用量及作物间分配比例进行了研究，结果表明，该种植模式在中产田的周年氮肥最佳施用总量为342．8kg／hm^2，小麦、玉米和大豆适宜分配比例为33．76：35．71：30．54，各作物最佳施氮量为小麦115．73kg／hm^2、玉米122．41kg／hm^2、大豆104．69kg／hm^2。
英文摘要：
By adopting the double optimal value method, the annual optimal amount of nitrogen fertilizer and the ratio of ni- trogen fertilizer distributed among crops in the relay - planting system of ＂ wheat/maize/soybean＂ were studied. The results showed that the annual optimal total amount of nitrogen fertilizer applied in this system was 342. 8 kg/hm^2 in the medium - yield cropland. The suitable distributive proportion of nitrogen fertilizer was 33.76： 35.71： 30. 54 among the three crops, it indicated that the applying amounts were 115.73, 122. 41, 104. 69 kg/hm^2 in the relay - planting system for wheat and maize and soybean respectively.
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