Cause
First, transgenic hybrid cotton has higher requirements for potassium fertilizer than conventional hybrid cotton, and the rate of absorption and conversion of potassium fertilizer is slow. If the amount of potassium is insufficient, it is easy to express the symptoms of potassium deficiency. Second, the current old cotton field is more The new cotton field is less, the soil organic matter content of cotton field is decreasing, and the potassium content is not high. Third, many farmers are accustomed to partial application of nitrogen fertilizer, ignoring the application of potassium fertilizer. However, excessive nitrogen fertilizer will cause excessive growth of cotton nutrition, which is more likely to cause premature aging; It is misunderstood that the compound fertilizer contains potassium fertilizer, and there is no need to apply potassium fertilizer. The fifth is insufficient understanding of the relationship between potassium fertilizer and cotton growth.
Prevention and treatment
In the middle and late management of cotton, it is necessary to emphasize the need to apply and apply potash. First of all, to ensure that the amount of potassium applied per mu is not less than 60 kg, such as the application of potassium chloride with 60% potassium oxide, not less than 60 kg per mu, compound fertilizer has been applied, because the compound fertilizer contains potassium. The amount of potassium applied may be reduced; secondly, the fertilization period is better with half of the base fertilizer and topdressing, and no potassium fertilizer is applied to the base fertilizer. 40 kg of potassium is applied per mu in the bud stage, and 20 kg is applied in the flowering and boll period; the third application method On the top, it should be mixed with nitrogen and phosphate fertilizers. In the bud stage, combined with the cultivating and cultivating soil, the deep application of the hole in the flowering and bolling period should be avoided to prevent the loss after rain.
Author: Zhang Yuhong
Source: Agricultural Science and Technology News
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