地膜棉花优质高产综合农艺措施的产量函数模型及其应用的研究

 本试验采用5因素二次正交旋转回归设计的方法，研究了影响地膜棉花优质高产的密度、播期、追施氮肥量、化控量及果枝数等5项农艺措施之间的关系，获得了中等以上肥力的地膜棉田棉花产量形成的函数模型及最佳农艺措施组合方案。在本试验条件下5项农艺措施对产量影响的顺序为密度＞化控量＞播期＞果枝数＞追施氮肥量。另外还研究了各项农艺措施间的交互作用效应。并在试验的基础上，进行了小面积的信息反馈对比示范试验，对比示范结果表明，运用优化栽培组合方案增产幅度大，经济效益显著。

STUDY ON COTTON-YIELD SIMULATION MODEL AND ITS APPLICATION UNDER COMBINATION AGRONOMIC MEASURES WITH FILM-MULCHING FOR GOOD-QUALITY AND HIGH-YIELD

Regression method of orthogonal conic substitution with 5 factors has employed in this study. Plants/mu, sowing date, the supplement of nitrogen, the concentration of growth regulator and the number of fruiting branch, which can all affect the yield of cotton in film-mulching condition, were studied numerically and synthetically. Being experimented in three years and many test sites, the cotton-yield simulation model was built up, and the optimal combination of farming practices was obtained. The model was used to study the responses and interactional effects among the practices in the yielding. The results of simulation experiment show that the optimal combination of farming practices greatly increase the yield and benefit.