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广大棉农,往往采取旱期刚露头时不抗,后期不敢抗或抗旱抗过头.其时正值棉株花铃期,需水量约占全生育期总量的50～60％,土壤湿度需保持18～24％。若低于17％,就会抑制棉株的生长;低于15％,花蕾幼铃就会大量脱落。说明及时抗旱确实很重要。我站经过数年实践,探索用青光来预报伏旱,方法如下: 1.7～9月中旬的盛夏季节,日落后傍晚时分,在西北方出现4～5条青光持续2～3天,则预示天气要进入伏旱。谚语:“青崩白崩、晒死老蚌”,就是
The vast majority of cotton farmers often resist the drought when they first emerge, and they are afraid of resistance or drought resistance in the latter part of the period. At that time, cotton plants needed about 50-60% of the total growth period, Maintain 18 ~ 24%. If less than 17%, it will inhibit the growth of cotton plants; less than 15%, flower buds will be a large number of young off. It shows that timely drought is really important. After several years of practice in our station, we have explored the use of glaucoma to forecast the drought. The method is as follows: From mid-summer mid-July to mid-summer mid-summer, after sunset, 4 to 5 glaucoma emerge in the northwest for 2 to 3 days, The weather is about to enter the drought. Proverb: “avalanche collapse, sunbathing old clam,” that is