地膜覆盖栽培的棉花,比常规直播的产量高,土壤输出的矿质元素相应也多。但目前只注重增磷补氮而忽视补充钾素,造成了高产棉花对三大要素需求量的不平衡。因此,适量增施钾肥,平衡土壤肥力,有利于地膜棉花的高产优质。施用量及经济效益 1982年我县在陈集、姑庵等12 Mulch mulched cotton, than the direct production of high-yield, the corresponding mineral elements output by the soil. At present, however, it only focuses on increasing nitrogen and supplementing nitrogen while ignoring the supplement of potassium, resulting in an imbalance in the demand of the three major factors for high-yield cotton. Therefore, an appropriate amount of potassium fertilizer to balance soil fertility, plastic film is conducive to the high yield and quality of cotton. The amount of application and economic benefits in 1982 in our county in Chen, Gu Um, etc. 12