First, the cause of premature aging. 1. The transgenic hybrid cotton needs more potassium fertilizer than the conventional hybrid cotton, and the absorption and conversion rate of the potassium fertilizer is slower. If the potassium application rate is insufficient, it is easy to show the symptoms of potassium deficiency; 2. The current cotton field is much more The new cotton fields are small, the soil organic matter content of the cotton field is decreasing, and the potassium content is not high; 3. Many farmers are accustomed to partial nitrogen fertilizer, neglecting the application of potassium fertilizer, but too much nitrogen fertilizer will lead to excessive growth of nutrients in cotton, and more likely to cause premature aging; 4 Misconception that potassium fertilizer is contained in compound fertilizer and no need to apply potassium fertilizer; 5. There is insufficient understanding of the relationship between potash and cotton.
Second, prevention and control measures. In the mid and late management of cotton, it must be emphasized that good and potash fertilizer should be applied. 1. To ensure that the amount of potassium per acre is not less than 60 pounds, such as the application of potassium chloride with a potassium oxide content of 60%, not less than 60 pounds per acre, and the compound fertilizer has been applied since the compound fertilizer contains potassium. Potassium application rate can be reduced. 2. Fertilizer use base fertilizer and topdressing fertilizer should be applied in half, potassium fertilizer should not be applied in base fertilizer, and 40 kg of potassium per acre should be applied in bud stage, and 20 kg must be applied in flowering period; 3. Application method On the other hand, it should be mixed with nitrogen and phosphate fertilizers, bud stage combined with cultivating soil to open trenches, and deep in the flowering and bolling period to avoid spreading and prevent loss after rain.
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