Early-stage mulching of early-stage mulch cotton and its premature aging

In recent years, due to the warming and conservation measures of cotton, the transformation of soil nutrients has been accelerated and the accumulation of early soil nutrients has been promoted. This has led to excess nutrient in the seedling stage of cotton, which led to early growth and lack of fertilizer and water in the later period. In addition, the high temperature and drought during the booming period, or drastic changes in droughts and floods, or the late fall in temperature, and the lack of certain nutrients caused by long-term continuous cropping, are also major factors that aggravate premature aging and should be prevented as soon as possible.
1. Increased application of organic fertilizers and potash fertilizer tests showed that generally covered cotton fields containing less than 85 ppm of available potassium and less than 0.8% of organic matter are prone to premature senescence. Mushrooms should be applied to 5000 kg of crude fertilizer, 15 kg of potassium chloride, or After removing the film, apply potassium fertilizer.
Second, timely control with 0.02% shrinkage solution soaking, can promote root development, control of vegetative growth, early flowering, flowering period were used 1 g, 3 ~ 5 grams. After being topping, it was chemically controlled with 5 grams of Dioscorean, which was delayed by 15 days compared to uncontrolled ridging time. The life span of the leaves was extended by 6 days, and the disease rate of the seedlings was reduced by 32%, the boll disease was reduced by 18%, and the drought elephants were postponed by 12 days.
Third, the re-application of flower and bell fertilizer, watering full-bloom aquatic boll period is cotton fertilizer, demand peak period, this time not timely watering topdressing, the original soil nutrients alone can not meet the needs of growth and development, in this stage should be chased Application of about 15 kilograms of urea, full of water, is an effective measure to prevent premature decompensation of cotton.
Four, middle and late foliar spray fertilizer Fertilizer spray fertilizer results showed that with 4% of superphosphate, 0.5% potassium dihydrogen phosphate, 2% urea solution on August 10, August 18 spray Two times (50 kg per acre spray fertilizer), have different effects of extending leaf function, increasing boll weight, and increasing production. Among them, potassium dihydrogen phosphate had the best effect, calcium superphosphate was the second, and urea was again. Its days of prolongation of leaf function were 18, 11 and 9 days respectively, and the increase rates were 16.2%, 10.5% and 10%, respectively.

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