1989～1992年4年的小区和大田试验示范结果表明,苏北沿海棉区土壤含钾量虽然较高,但在棉花生长的中后期,由于根系活力衰退,棉株体内钾的含量不足,使氮钾比例失调,导致棉花落叶早衰。在棉花生长发育过程中合理施用钾肥,一般可增产10%左右,还能改善纤维品质。 During the four years from 1989 to 1992, plot and field experiments showed that although the soil potassium content in the northern Jiangsu coastal cotton area was relatively high, the potassium content in the cotton plants was insufficient due to the decline of root activity in the middle and later stages of cotton growth Nitrogen and potassium imbalance, leading to premature decay of cotton leaves. In the process of cotton growth and development of the rational application of potassium, can generally increase about 10%, but also improve fiber quality.