南疆沙壤土地面灌溉高产棉田施肥灌水数学模型研究

在南疆沙壤土棉田,设置了3个处理因子(施氮、施磷和灌水),每个因子依施用量设4个水平,开展了水肥耦合效应对棉花产量影响的田闻试验研究.试验结果表明,棉花产量对氮肥、磷肥、水的依赖程度顺序是:氮肥＞磷肥＞水,并建立了地面灌溉条件下高产棉田水肥施用的多元回归数学施肥模型:y=-677.8075+0.5889 xN+11.1...

Study on the Mathematical Model of High-yield Cotton for Fertilizer and Irrigation Using Surface Irrigation in Sandy Loam of Southern Xinjiang

 Three processing factors' experiment(nitrogen, phosphorus and irrigation) were set in sandy loam of Southern Xinjiang, and there were four levels in each factor. It carried out the coupling research of water and fertilizer effects on cotton field. Through the analysis, the dependence degree of cotton yield on the nitrogen, phosphate, and water was: nitrogen> phosphate> water. Fields fertilizer and irrigation applied mathematical model of the multiple regression for the high-yield cotton was established under the condition of surface irrigation, and it was as follows: y=-677.8075+0.5889 xN +11.1649 xP +1.0266 xW - 0.0098 x²N -0.0421 x²P - 0.0001 x²W +0.0130 x²NP +0.0012 x²NW -0.0002 x²PW(r=0.9825^*). The analysis of variance was significant (P= 0.01380.05). It could obtain the best lint yield 3897.88 kg·hm^-2 from regression model analysis while the pure nitrogen, phosphorus and irrigation amount were 545.50 kg·hm^-2, 199.72 kg·hm^-2, 6429.37 m3·hm^-2, respectively.