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本文通过1991—1992年度在同德县牧区农业综合开发示范区，以氮肥（N）、磷肥（P2O5）、有机肥（M）施用量为因素的三元二次回归正交试验，建立数学模型，并对模型解析，表明本地区老水地油菜栽培中，三因素对产量的作用依次为N＞M＞P2O5。当施N量达到12．18kg／mu后继续增N，则发生负效应。N与M之间有显著的交互效应，它们对产量的交互效应有一最优区域，即当N取［0，1］、M取［0，r］水平时最高产量可达212．55—247．22kg／mu。进而经计算机模拟选优，确定了不同目标产量下的最佳施肥方案。
In this paper, 1991-1992 years in Tongde County pastoral areas of agricultural comprehensive development demonstration area, with nitrogen (N), phosphate fertilizer (P2O5), organic manure (M) application of factors as a three-factor quadratic regression orthogonal experiment, the establishment of mathematical models , And analyzed the model, indicating that the effect of three factors on the yield of Laodehui rape cultivated in this region was N> M> P2O5. When the amount of N applied reaches 12.18 kg / mu and then increases by N, negative effects occur. There is a significant interaction effect between N and M, and their interaction on yield has an optimal region, that is, when N takes [0,1] and M takes [0, r], the highest yield can reach 212.55-247 .22 kg / mu. Then by computer simulation optimization, to determine the best target of different yield fertilization program.