棉花在开花结铃期,需要大量水份。这时上海郊区往往会出现干旱天气,如果不及时灌溉,就要造成棉田缺水,影响棉花现蕾、开花和结铃。因此,适时做好抗旱工作十分重要。去年8月8日,我站同张江、合庆等公社气象哨测定棉田10～40公分的土壤湿度,平均只有18～20%;8月15日已降至17%左右,旱情有所发展。为了检验棉花抗旱的效果,我们在城镇公社城南六队作了抗旱与不抗旱的对比试验。选择一块约2亩的棉田, Cotton in the flowering period, requires a lot of water. At this time, the suburbs of Shanghai often have arid weather. If they are not irrigated in time, it will cause water shortage in cotton fields and affect the cotton budding, flowering and ringing. Therefore, it is very important to do a good job of drought relief in due time. August 8 last year, I stood with Zhangjiang, Heqing and other communes meteorological whistle determination of cotton soil 10 to 40 cm of soil moisture, an average of only 18 to 20%; August 15 has dropped to about 17%, the drought has developed. In order to test the effect of cotton drought, we made a comparative test of drought resistance and non-drought resistance in Chengnan Sixth Team of Urban Commune. Choose a cotton field of about 2 acres,