棉花开花期间雨水破坏了授粉过程,因而使子房不能受精,产生大批幼铃的脱落。但一天之间,下午4时以后及夜晚的雨水已不足影响授精,因而对幼铃的脱落影响也较小。液体农用药剂上午喷射较下午喷射能造成棉铃较高的脱落率,下午4时以后喷射较妥。果枝环剥,留2叶1花后,能使不受精的子房100 %不脱落并且产生无子果实,说明有机养料在子房发育果实成长过程中的重要作用,不仅对于单性结实的理论提出了主要由于有机养料供应充足的不同的见解,并且对减少棉花落铃方面提出了全面注重栽培技术的原则性建议。 Rain during the cotton flowering destroyed the pollination process, so that the ovary can not be fertilized, resulting in a large number of young bell off. However, day after day, after 4 pm and at night, the rainfall has been insufficient to affect insemination, so the impact of young bell shedding is also small. Spray of liquid agricultural chemicals in the morning than in the afternoon caused a higher dropout rate of cotton bolls, and the injection was better after 4 p.m. Fruiting branch girdling, leaving 2 leaves 1 flower, can make 100% non-fertile ovary does not fall off and produce non-fruit, indicating the growth of organic nutrients in the ovary during the development of an important role, not only for the theory of parthenocence Proposed different opinions mainly due to the abundant supply of organic nutrients and put forward the principle suggestion of paying full attention to cultivation technology in reducing cotton drop bells.