In the late growth stage of cotton, the absorption function of nutrients in roots is obviously reduced. At this time, the leaf absorption function is used to supplement the nutrition of foliar spray fertilizer, which has the functions of preventing premature aging, preventing disease, preventing falling bell, attacking peach and promoting early maturity, and increasing yield. The effect of increasing revenue is significant. The specific technology is:
1, spray nitrogen to prevent premature aging. From late August to early September, the spraying of nitrogen fertilizer on the leaf surface can keep the cotton leaves and leaves green, enhance photosynthesis, prevent premature aging and increase yield. The method is to use 75-100 kg of 1% urea solution per acre, or to prepare 1% urea and 3000-4000 times 802 mixture, 75 kg per mu, and spray once every 5-7 days. Spray even 2-3 times.
2. Spray potassium to prevent disease. Potassium deficiency in cotton often causes red leaf stem blight during flowering and bolling. The cotton leaves are yellowish red and fragile and fall off, leading to early decay of cotton plants. Spray 0.3% potassium dihydrogen phosphate solution, spray 75 kg per acre, spray 2-3 times; or spray with 5% ash ash soaking filter to prevent disease and prevent disease.
3, spray zinc anti-falling bell. Zinc deficiency in cotton causes partial green chlorosis, leaf wilting, and new bells fall off. The zinc spraying method is: spraying 75 kg of zinc sulfate or zinc chloride aqueous solution of 0.1-0.2% concentration per acre, spraying once every 5-7 days, and continuously spraying 2-3 times.
4, spray boron to attack the peach. The cotton plant is deficient in boron, the fruit branches are high, the side branches are many, the leaves are thick, and the buds of the buds are easy to open and fall off, resulting in buds without flowers, flowers and leaves, flowers and bells are thin, small peaches, low yield, timely spraying Boron, supplemented with boron nutrition, is conducive to multi-peach peaches, knotted peaches. Generally, starting from the flowering and bolling period, every 10-15 days, spray 0.2% borax or 0.1% boric acid solution 75-100 kg per acre, spray 2-3 times continuously, and add 0.5% urea when spraying. Better results.
5, spraying phosphorus to promote early maturity. From the end of August, use 1 kg of superphosphate and 50 kg of water, soak for 24 hours (frequently stirred), filter to remove slag, spray 100 kg of filter per mu, or combine 300-500 times with potassium. 100 kg of potassium dihydrogen phosphate solution, once every 5-7 days, even spray 2-3 times, can make cotton plants grow robust, promote cotton boll development and seed fullness, increase boll weight, early boll opening.
(Manan)
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