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棉花上层叶的光合速率在强光下高于中下层叶,在弱光下则相反。消光系数降低有助于提高群体光能利用率。适当地增大棉花主茎间距,降低上层叶所占比例和角度指数,有利于减少消光系数。作者还对适应于四川棉区生态条件下棉花的合理株型提出了一些设想。
The photosynthetic rate of the upper leaves of cotton is higher than that of middle and lower leaves in bright light and opposite in low light. Reducing the extinction coefficient helps increase the group’s light energy utilization. Appropriate to increase the cotton main stem spacing, reducing the proportion of upper leaves and angle index, help to reduce the extinction coefficient. The author also put forward some tentative ideas for the rational plant type of cotton adapted to ecological conditions in Sichuan cotton area.