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1978～1981年,连续四年进行对比试验观察,在棉花有效开花结铃季节里,如果喷灌、喷药液的时间恰好碰上开花受粉时,会使幼铃大量脱落,造成减产。1、因为棉花是每天上午开花授粉的,如果喷灌或喷药液,会使花粉粒吸水膨胀破裂,而不能受精;下午16时后授粉受精过程已基本结束,再进行喷灌、喷药液的影响比上午小;通过几年的试验结果,下午喷灌或喷药液的脱落率比上午喷的脱落率少9.29～26.80%。2、棉花的铃重与子粒饱满
From 1978 to 1981, for four consecutive years of comparative experiments observed in the cotton flowering and bolting season, if the sprinkler, spray liquid time just hit bloom when the powder will make a large number of young bell off, resulting in reduced production. 1, because the cotton is pollinated every morning, if the sprinkler or spraying liquid, pollen grains will make water swelling and rupture, and can not be fertilized; after 16:00 pollination and fertilization process has been basically completed, and then sprinkler, spray liquid influence Than the morning small; through several years of test results, the afternoon sprinkler or spray liquid off rate than the morning spray shedding rate of 9.29 ~ 26.80% less. 2, cotton boll weight and grain full