天气炎热多雨,干旱高温,棉花的蕾铃就会大量脱落,导致大幅度减产。如遇到这些情况,可采取以下措施进行防治:多雨脱落:棉田含水分超量,有的死洼存水泡根,土壤板结,失去通透性,微生物也失去活性,营养滞供,棉叶薄黄色,蕾铃逐渐脱落。防治办法:在棉田四周挖沟。沟宽40厘米,深47～65厘米,使棉田水分减少。死洼存水尽快排出田外,随后进行中耕松土,叶面喷施叶 Hot and rainy weather, drought and high temperature, cotton buds will fall off a lot, leading to a substantial cut. In case of these situations, we can take the following measures to prevent and control: Rainy fall: cotton field contains excess water, some watery roots, soil compaction, loss of permeability, loss of activity of microorganisms, nutrient delay, thin cotton leaf Yellow, buds gradually fall off. Prevention and control measures: Digging ditches around the cotton fields. Groove width 40 cm, depth 47 ~ 65 cm, so that cotton moisture reduction. Death depression drainage field as soon as possible, followed by cultivating loose soil, foliar spray leaves