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棉花生长后期叶面喷磷,可弥补根系吸磷的不足,促进种子饱满,增加铃重,提早吐絮,并能增产7%以上。喷磷还能减轻棉铃虫危害,因为棉叶分泌的草酸有诱蛾产卵的作用,造成棉铃虫落卵量增加,而喷过磷酸钙后,草酸与钙化合变成草酸钙,失去诱蛾作用,从而可大大减轻棉铃虫危害。具体用法:从8月下旬开始,每次每亩用1%～3%过磷酸钙溶液75公斤喷洒棉叶,每隔7天喷1次,连续喷施2～3次,注意浓度不可过大,以防灼伤叶片。
In the later stage of cotton growth, foliar application of phosphorus could make up for lack of phosphorus uptake in the root system, promote seed fullness, increase boll weight, prematurely flocculent and increase yield by more than 7%. Phosphate can also reduce the harm of cotton bollworm, cotton oxalate secreted by the role of oviposition induced moth, cotton bollworm egg loss increases, and sprayed with calcium phosphate, oxalic acid and calcium into calcium oxalate, loss of lures Role, which can greatly reduce the harm of cotton bollworm. Specific usage: From the beginning of late August, each with 1% to 3% per acre with 75 kilograms of superphosphate spray cotton leaves, spraying every 7 days 1, spraying 2 to 3 times in a row, pay attention to the concentration can not be too large , To prevent burns leaves.