棉花生长后期叶面喷施过磷酸钙液,可弥补根系吸磷的不足,促进种子饱满,增加铃重,提早吐絮,从而增产。同时棉叶分泌的草酸可诱蛾产卵,但喷过磷酸钙后,草酸与钙化合成草酸钙,失去诱蛾产卵作用,可大 The late growth of cotton foliar spraying superphosphate solution, phosphorus deficiency can make up for the roots, and promote seed fullness, increase boll weight, early vomit flocculus, thereby increasing production. At the same time the oxalic acid secreted by the cotton leaf can attract the moth to lay eggs, but sprayed with calcium phosphate, the oxalic acid and calcium oxalate are synthesized, losing the lure effect of the lure