苜蓿水肥耦合模型及其优化组合方案研究

Model on Coupling Water with Fertilizer of Lucerne and Its Optimum Combination Scheme

基于三因素二次回归通用旋转组合设计试验，得出西北干旱地区宁夏盐池县农牧交错区苜蓿灌溉定额、施氮量和施磷量与产量效应的优化回归数学模型．经模型解析，得到了各因素影响苜蓿产量的规律和特点；经模型寻优，求出了在不同目标产量下的最优水、肥组合方案．这对类似干旱地区的节水灌溉具有指导意义．

Based on the experiment of the current rotary combination design of square regression of 3 factors with 5 levels,the mathematical model of effects of irrigation quota and the amount of N,P upon lucerne yields in agriculture animal husbandry crisscross zone in Yanchi county of Ningxia in the arid region of the Northwest China has been obtained.Laws and charcteristics between 3 factors and lucerne yields were obtained through model analysis;optimum combination scheme of water with N,P chemical fertilizers under different yields were obtained through finding optimum solution of model.This paper has guiding significance to water saving irrigation of similar arid regions.