棉花最佳成铃模式的研究

STUDY ON THE OPTIMAL RETAINED PATTERN OF COTTON

本文在1987年试验基础上,1988年继续应用二次正交旋转组合设计的方法,对密度、氮素、单株果枝数及缩节安化控四项农艺措施进行综合研究,根据研究结果建立了产量、成铃分布、亩果节回归模型。通过数学模型筛选出亩产子棉225kg以上的优化农艺措施组合方案,给出了该优化组合最佳的成铃模式和分布特点。此外,还给出了该优化组合的亩果节数、蕾铃脱落率的动态变化曲线,为该优化方案实施时提供诊断指标和参数。

On the basis of the preliminary experiment in 1987, the design of quadratic orthogonal ro- tation regression was applied in 1988 to study comprehensive effects of four ecological culture factors-density, nitrogen fertilizer, fruiting branch number per plant and DPC on the growth and development of the cotton population. According to result of experiment, the regression model for the yield, distribution of retained boll, fruiting node number and sheding percentage in cotton population in development stage is established in this paper. Through simulating test of the mathmatical model, the optimal combination of agronomic measures is selected, which ensures cotton seed yield over 225kg/mu. The optimal pattern of retained boll and character of distribution of boll of the best combanation are given. The proper dynamics for fruiting node number per mu and sheding percentage in cotton population is also described.