不断探索用药物防止蕾铃脱落的方法我站土法上马,用自制“九二○”防止棉花落蕾落铃,做了几年试验和生产鉴定工作。最初进行点喷或涂铃,费工多,药量不易掌握,而且棉花已经封行,人工点涂往往会损伤部分果枝和蕾铃。于是我们改用喷雾器在盛花期间喷施一两次“九二○”,但效果不如点涂的好,而且当棉花出现旺长时,喷施“九二○”等于火上加油,促成徒长。后来我们又做了喷“九二○”结合打顶的试验,效果仍不理想。1973—1974年,先后进行了合喷“九二○”与矮壮素的小区试验和大田生产鉴定,证明这一措施比单喷“九二○”或单喷矮壮素的效果都好,一般平均增产皮棉15％左右。主要是减少了蕾铃脱落,增加了成铃率和铃重,促进 Continue to explore ways to prevent the use of drugs to prevent the fall of the bell I stand Tufa, with homemade “920” to prevent falling cotton fall and fall bell, do a few years of testing and production appraisal work. Initially point spray or Tu bell, more labor, the dose is not easy to grasp, and cotton has been sealed, artificial spot coating will often damage some fruit branches and buds. So we switched to a sprayer once or twice during the full bloom. However, the effect was not as good as that at the time of spraying. And when the cotton grew prosperous, spraying “920” was equivalent to adding fuel to the fire and making it leggy. Later, we did a spray test of “920” with topping, and the effect was still not satisfactory. 1973-1974, has conducted a combined spray “920” and CCC plot test and field production appraisal, to prove that this measure than the single spray “920” or single spray mescaline effect is good, The average increase of about 15% lint cotton. Mainly to reduce the loss of the buds, increased boll rate and boll weight, promote