棉花生理上的落蕾落铃现象,受到许多环境因素的影响。在肥料水分充足地区,密植棉田,经常看到棉株营养体茂盛的生长,枝叶相互叠置隐蔽,造成棉田高度郁闭状况。这时,光线强度无疑地是影响棉花蕾铃脱落的主要而突出的因素。1953年棉花生长到盛花期后,经过我们简单的遮光试验,已初步指出光线强度减弱 Physiological cotton falling off the bell phenomenon, by many environmental factors. In areas with adequate fertilizer and water, dense cotton fields often show the flourishing vegetative growth of cotton plants, the branches and leaves overlap each other and hide, resulting in a high degree of canopy condition in cotton fields. At this time, the light intensity is undoubtedly the main and prominent factor that affects the cotton buds falling off. After the growth of cotton in 1953 to flowering, after our simple shading test, has initially pointed out that the light intensity weakened