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化学脱叶是机械采棉的必要条件之一。 3年的研究表明 :南疆化学脱叶的适宜施药期为 9月中旬 ;最佳配方为德落宝 2 0 g加乙稀利 70 g。化学脱叶率与药后 6～ 1 0天和药后 1 0天内日平均气温密切相关 ;药后气温变化趋势对脱叶率影响很大。文中还提出了施用脱叶剂的有关技巧
Chemical defoliation is one of the necessary conditions for mechanical pick-up of cotton. 3 years of research shows that: Nanjiang chemical defoliation appropriate application period for the mid-September; the best formula for De Po 2o g plus 70g. Chemical defoliating rate is closely related to the daily average air temperature within 6-10 days after drug treatment and within 10 days after drug treatment. The change trend of temperature after treatment has a great effect on the defoliating rate. The paper also proposed the application of defoliants related skills