In the large-scale cotton production process, premature aging occurs almost every year, resulting in different degrees of cotton production cuts. The cause of premature aging is of course many, but among the many factors, fertilization is the most relevant.
By summarizing the lessons learned from the introduction of transgenic hybrid insect-resistant cotton in recent years, we have realized that: First, transgenic hybrid insect-resistant cotton requires a larger amount of potash than conventional hybrid cotton, and the absorption and conversion rate of potassium fertilizer is slow, if potassium is applied. Insufficient quantity is very easy to show the symptoms of potassium deficiency. Second, there are many old cotton fields and few new cotton fields. The content of organic matter in the soil of cotton fields is declining. The potassium content is not high; Third, many farmers are accustomed to partial application of nitrogen fertilizer, neglecting the application of potassium fertilizer. , I do not know too much nitrogen fertilizer will lead to excessive growth of cotton nutrition is more prone to premature aging; Fourth, mistakenly believe that the compound fertilizer contains potash, no longer apply potassium fertilizer; Fifth, the relationship between potassium and cotton fertility lack of understanding.
With the addition of potash fertilizer, one can improve the ability to defend against the occurrence of cotton wilt disease, and the number of diseased strains can be significantly reduced. Secondly, it can increase the stamina of cotton production and prevent premature aging. Thirdly, it can increase the number of bolls per plant. Fourth, it can increase the boll weight by 0.5 to 1.2 grams. Good quality; five can strengthen the lodging resistance of cotton plants.
To this end, in the management of cotton in the middle and later stages, it must be emphasized to give enough potash fertilizer. The first is to ensure that the amount of potassium per acre is not less than 30 kilograms, such as the application of potassium chloride with a potassium oxide content of 60% per acre. Not less than 30 kilograms, has been applied to the compound fertilizer, due to potassium fertilizer in the compound fertilizer can be reduced by the amount of potassium; Second, the fertilization period to the base fertilizer, top dressing is applied as half, the base fertilizer is not applied potassium fertilizer, bud stage 20 kg per acre of potassium, and 10 kg in flowering and bolling period; thirdly, application methods should be combined with nitrogen and phosphate fertilizers; bud stage should be combined with cultivating soil to open trenches; Shi to prevent loss after rain.
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