渭北东部灌区地膜棉高产模式研究

Study on High yielding Cultivation Model for Film mulching Cotton in East Irrigation Area of Weibei

采用５因素２次正交旋转回归设计，建立了适宜渭北东部灌区的地膜棉密度、Ｎ、Ｐ、缩节胺和麦草覆盖综合回归模型。结果表明：各因素对地膜棉产量影响的顺序为密度＞缩节胺＞麦草覆盖＞Ｐ＞Ｎ。研究了各项农艺措施间的交互作用对产量的效应，获得了最佳农艺措施组合方案，筛选出皮棉产量大于１５００ｋｇ／ｈｍ２的优化组合和群体结构指标，明确了栽培措施的主次，通过反馈和示范，能有效提高棉花的产量和效益。

Regression method of orthogonal conic substitution with 5 factors was employed to build the film mulched cotton yield simulation model with density, N,P, DPC and wheat chaffs mulch in east irrigation area of Weibei. The results showed that the sequences of factors affecting film mulched cotton yield were density > DPC > wheat chaffs mulch > P > N. The model was used to study the interactional effects among the practices on yield. The optimal combination and population dynamics indexes for lint yield over 1 500 kg/hm 2 was obtained. The result of feedback and simulation experiment showed that the optimal combination of cultural practices increased the yield greatly.