Insufficient application of potassium fertilizer in cotton should be paid attention to

Recently, the author went to the cotton area with the China Association of Rural Technology Cotton Experts to find that after this year's cotton experienced a drought, the current rainwater was suitable, and the cotton began to rapidly transform. The early cotton has begun to ring, and most of the cotton has entered the blooming stage. . From the standpoint of cotton growth, the prominent problem is the widespread presence of defertilization. Among them, the symptoms of potassium deficiency are more serious in some cotton fields. Some cotton plants have yellow-white patches on their leaves, and the base leaves have turned brown and red patches. Serious leaf margin rolling, urgent need for timely application of potash fertilizer.
From the field survey, most of the cotton fields use insufficient potassium fertilizer. Some cotton farmers do not use potassium fertilizer because they do not know what the role of potassium fertilizer is. Some people think that the compound fertilizer or organic fertilizer that has been applied contains potassium fertilizer, so there is no need to apply it again. Potassium fertilizer with low potassium content was applied, and it was considered that the potassium fertilizer needed for cotton had been satisfied. Some farmers believe that only potash fertilizer can be used outside the root, and others think that the price of potash fertilizer is too high to increase the cost of planted cotton. It can be seen that the cotton farmers still lack sufficient knowledge about potash fertilizer.
First of all, to understand the role of potash. The application of potash fertilizer can balance the proportion of nitrogen, phosphorus and potash in the soil, increase the activity of cotton life, increase the number of peach per plant, significantly increase the boll weight, and improve the quality. The average yield per mu can increase about 50 kg of seed cotton. At the same time, increasing potash fertilizer can also increase cotton resistance to fusarium wilt.
Second, we must clarify the amount of potash. At present, the vast majority of farmers are genetically modified insect-resistant cotton varieties, according to many years of practical experience, high-yield cotton fields generally need to apply potassium chloride or potassium sulfate 60 kg per acre, sub-basin fertilizer and top dressing twice. The content of such potash potassium oxide is generally 60%, and the content of pure potassium in 60 pounds of potash is 36 pounds, and in 45% of the compound fertilizers of nitrogen, phosphorus and potassium, the content of pure potassium is only 15 pounds. Although organic fertilizers also contain potash, the content of pure potassium is even lower. Some potash fertilizers with trace elements also have low potassium content. Therefore, it is necessary to apply an authentic high-content potassium fertilizer to meet the needs of insect-resistant cotton. Although the application of potash outside the root can be supplemented with a small amount of potash, the cotton at the current stage should be treated with potash or ditch. Moreover, the current price of potash fertilizer in the market has fallen more sharply than in previous years, and the input-output ratio of potash fertilizer application is very cost-effective.
Third, we must improve the method of applying potassium fertilizer. We found in the survey that some farmers used too much potassium at a time, which would have an antagonistic effect on other fertilizers, affecting the absorption of other fertilizers by cotton, and should generally be divided into two applications of base fertilizer and topdressing, and no potassium fertilizer should be used in the base fertilizer. In the budding period and flowering period of cotton, it is applied in a timely manner. Potassium application outside the root is generally performed after a large amount of cotton bolls. Some farmers spread compound fertilizers or potash fertilizers on the surface of cotton fields. They lose or evaporate large amounts of waste and waste.

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