棉花地膜覆盖后,因其增温保墒效应,有效地解决了北方棉区春季干旱多风,缺株断拢的问题。但是,由于苗期地膜下表层土壤和深层土壤温差过大,地上部分生长较快,抑制了根系的生长速度,特别是主根下扎速度极慢,根冠比例失调,从而导致棉花中后期倒伏早衰,不能很好的利用有效生长期,影响棉花的增产潜力。针对这个问题, After cotton mulching, due to its effect of increasing temperature and preserving soil moisture, it effectively solved the problem of windy and windy season in spring and drought in northern cotton area. However, due to the excessive temperature difference between the surface subsoil and the deep soil in the seedling stage, the aerial part grew rapidly and inhibited the growth of the root system. In particular, the rate of root sub-banding was very slow and the ratio of root and shoot was imbalanced, , Can not make good use of effective growth period, affecting cotton yield potential. for this problem,