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At present, the soil is generally deficient in potassium. In particular, due to the thinness of the soil and poor fertility in the cotton-planting area, and the neglect of potassium fertilizer input in the fertilization habit, cotton has different degrees of potassium deficiency, which seriously affects the quality of cotton and reduces the yield. From the production practice of planting insect-resistant cotton in recent years, it is known that insect-resistant cotton is more sensitive to potassium fertilizer, and the application of potassium fertilizer can prevent physiological red leaf stem blight and premature aging of cotton, thereby improving cotton quality and increasing yield. According to the test, the ratio of NPK is 1 to 0.5 to 1 to 1 to 0.5 to 0, and the acre is 7.1 percent. Therefore, we should vigorously promote the application of potassium fertilizer to insect-resistant cotton. At the same time, we must pay attention to the input of phosphate fertilizer and micro-fertilizer, and adjust the ratio of nitrogen, phosphorus and potassium to 1 to 0.5 to 05 to 10.
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