First, we must understand the role of potash. Because the application of potassium fertilizer can balance the proportion of nitrogen, phosphorus and potassium fertilizer in the soil, enhance the life activity of cotton, increase the number of peaches per plant, increase the weight of bolls and improve the quality. Muping can increase the yield of seed cotton by 50 kg, and the potassium deficiency is serious. Cotton fields can increase production by up to 80-100 kg. At the same time, it can also enhance the ability to resist and compensate for blight.
Second, determine the amount of potassium fertilizer. At present, the vast majority of farmers are genetically modified insect-resistant cotton. According to years of experience, high-yield cotton fields generally require 60 kg of potassium chloride or potassium sulfate per acre, and two applications of base fertilizer and top dressing. The potassium content of this kind of potassium fertilizer is generally 60%, and the pure potassium content of 60 kg of potassium fertilizer is 36 kg, while the pure potassium content of 45% of nitrogen, phosphorus and potassium compound fertilizer is only 15 kg. Although organic fertilizer also contains potassium fertilizer, the content of pure potassium is lower. Some potassium fertilizers with trace elements have low potassium content. Therefore, it is necessary to apply authentic high-content potassium fertilizer to meet the needs of insect-resistant cotton. Although the external application of potassium fertilizer can supplement a small amount of potassium fertilizer, the current cotton growth should be ditch or potting. Moreover, the current price of potash in the market is much lower than in previous years, and the ratio of input to output of potash is completely cost-effective.
Third, improve the method of applying potassium fertilizer. In our investigation, we found that some farmers applied too much potassium fertilizer at one time, which would antagonize other fertilizers and affect the absorption of other fertilizers by cotton. Generally, it should be applied twice by base fertilizer and topdressing, and no potassium fertilizer should be applied in the base fertilizer. In the cotton bud period and flower bell period, timely topdressing. Genwei spraying potassium fertilizer is generally carried out after a large amount of cotton is ringing. Some farmers apply compound fertilizer or potash fertilizer to the surface of cotton fields. The amount of loss or volatilization is large, and waste is more.
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