1990—1991年据七八两师11个团场的调查,大部分地膜棉花铃期蕾铃脱落剧坛,平均达74.9—86.4％,其中1—3果枝脱落率为69.3—75.80％,4—6果枝为72.3—85.1％,7—9果枝83.3—98.2％。除1—2圆锥体靠主茎能保住伏前桃外,其它圆锥体及外围铃易脱落,特别是7月7日—7月29日开花结的铃脱落甚多。查其原因系脱水脱肥,棉叶过早衰老,光合效 1990-1991 According to a survey conducted by 11 delegations of 782 institutes, most of the bolls of cotton bolls during the boll fall off the theater, with an average of 74.9-86.4%. Out of them, the shedding rate of 1-3 fruit branches was 69.3-75.80% 6 fruit branches 72.3-85.1%, 7-9 fruit branches 83.3-98.2%. In addition to the 1-2 cones by the main stem to keep the volts before the peach, the other cones and peripheral bell off easily, especially July 7 - July 29 flowering knot much off. Check the reason for dehydration and de-fertilization, premature aging cotton, photosynthetic efficiency