1.追肥时期:一般多采取分期追肥。第一次多在定苗到现蕾期进行,供给蕾期生育所需的养分,可催棵搭丰产架子和促进早现蕾,多现蕾;第二次多在开花期进行,能促进多结桃、结大桃,减少脱落。1971年盖县双台子公社四方台大队第四生产队,每亩棉田追20～30斤硫铵,分两次追肥的比一次追肥的田块增产36.4%。可见,分期追肥是夺取棉花高产的 1. Dressing period: generally take more staging top-dressing. For the first time more in budding to budding period, the supply of nutrients required bud stage, can promote the tree to take advantage of high yield shelves and promote early budding, and more budding; the second time more in flowering, can promote multi-node Peach, knot big peach, reduce loss. In 1971, the fourth production team of Sifangtai Brigade of Shuangtai Sub-commune in Gaoxian County chased 20-30 kg of ammonium sulphate per mu of cotton field, increasing the yield by 36.4% over that of the second top dressing. Can be seen that staging is to seize high-yielding cotton