| 摘要: |
| 采用三元二次回归正交组合设计，建立了不同降水年型地膜小麦产量与氮磷钾肥的模型关系，通过数学模型寻优得出达到某一产量所需的最佳施肥量，并根据肥料的产投比得出了经济目标产量，施肥量及比例直接影响作物的水分利用效率（WUE），增施肥料特别是磷肥和氮肥能显著提高地膜小麦的WUE。钾肥对WUE的影响较小。 |
| 关键词: 地膜小麦 施肥模型 渭北旱塬 |
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| 基金项目:国家“九五”旱农科技攻关项目(95-004-04-05)；农业部丰收计划项目(99-6-1-02-04-01) |
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| Fertilizer application model on winter wheat with plastic film mulching in Weibei Dryland |
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| Abstract: |
| The mathematical model has been set up to describe the relationships of grain yield to nitrogen,phosphorus and potassium in different precipitation years by means of the design of the regression-orthogonal combination in this study.From the model,the optimum amount of fertilizers is simulated.Economical object yield is obtained according to the ratio of fertilizers output to input.The amount and the ratio of applying fertilizer directly affect WUE.The WUE of film mulched wheat is increased with the amout of fertilzers,especially phosphorus and nitrogen,but the effect of potassium is smaller. |
| Key words: film mulched wheat fertilizer application model Weibei dryland |
