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棉花在花铃期吸收磷肥占全育期的76％,吸收钾肥占全生育期的78％,是棉花一生中吸收磷、钾肥最多的时期。而这时土壤养分下降,根系吸收能力减弱,通过喷施磷酸二氢钾,由叶片直接吸收利用,能补充棉花的磷素和钾素营养,延长绿叶寿命,增强叶片的光合作用,对减少蕾铃脱落,增加铃数、铃重、衣分均有较好效果。
Cotton in the flower-bolting stage to absorb phosphorus accounted for 76% of the whole growth period, absorption of potassium accounted for 78% of the whole growth period, cotton is the absorption of phosphorus and potassium during the life of the most. At this time soil nutrients decreased, the root absorption capacity weakened by spraying potassium dihydrogen phosphate, the direct absorption and utilization by the leaves, cotton can supplement the phosphorus and potassium nutrition, extend leaf life, enhance leaf photosynthesis, reduce the bud Bell off, increase the number of bell, bell weight, clothing points have better results.