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从经济和环境效益两个方面对描述冬小麦、夏玉米轮作制中作物产量对氮肥反应的四个施肥模型（二次型，平方根，二次型+平台，线性+平台）进行了比较研究．结果表明，不同模型的拟合程度都较高，且拟合程度和计算的最佳产量均无显著差异，但线性+平台和二次型+平台模型推荐的最佳施肥量大大低于二次型模型，因而经济效益较高．研究还表明，与二次型模型相比，采用线性+平台和二次型+平台模型推荐的最佳施肥量，有利于维持土壤无机氮的基本平衡（而不是显著上升！），提高氮肥利用率，并使小麦、玉米茎秆含氮量降低，表现出较佳的环境效应。
Four fertilization models (quadratic, square root, quadratic + platform, linear + platform) describing the response of crop yield to nitrogen fertilizer in winter wheat and summer maize rotation were compared from two aspects of economic and environmental benefits. The results show that the fitting rates of different models are high, and the fitting degree and the optimal yield are not significantly different, but the recommended optimum fertilization rate of linear + platform and quadratic + platform model is much lower than the second Type model, and thus higher economic benefits. The study also showed that the optimal amount of fertilizer recommended by linear + platform and quadratic + platform models compared with the quadratic model was conducive to maintaining the basic balance of inorganic soil nitrogen (rather than significantly increased!) And increasing the use of nitrogen fertilizer Rate, and make wheat, corn stalks nitrogen content decreased, showing better environmental effects.