棉花蕾铃脱落是生产上普遍存在而又复杂的一个问题,脱落率一般为60～70%,严重的可达80%以上。它是内因和外因综合作用的结果。不同遗传类型棉花的蕾铃脱落,除受外界环境因素影响外,主要受遗传因素的制约。如陆地棉脱落率最高。中棉次之,海岛棉最低,其脱落率分别为80.3%、78.2%、44.2%。尽管人们采取种种措施,如小区内的自交等。对减少因雨脱落起一定作用。但在大面积生产上,棉花开花期间,如遇上阵雨和连雨,仍会造成子房大量脱落。因此,从落雨结铃的棉株进行了如下研究。 Cotton buds fall off is a common and complicated production problem, the rate of exfoliation is generally 60 ~ 70%, severe up to 80% or more. It is the result of a combination of internal and external causes. Different types of cotton boll fall off, except by the impact of external environmental factors, mainly due to genetic constraints. Such as the highest rate of land cotton shedding. Cotton in the second, the lowest island cotton, the shedding rates were 80.3%, 78.2%, 44.2%. Although people take various measures, such as community self-infiltration. To reduce the loss due to rain play a role. However, in large-scale production, cotton flowering periods such as showers and even rain will still cause large numbers of ovaries to fall off. Therefore, the cotton bolls from the rainbows were studied as follows.