Cotton leaves are the most important vegetative organs of cotton, with photosynthesis, respiration, transpiration and absorption. Using its absorption and photosynthesis, targeted foliar spray fertilizer can promote plant growth, enhance disease resistance, insect resistance, drought resistance, anti-premature aging, regulate vegetative growth and reproductive growth, and greatly increase yield and quality.
　　 1. Spraying type According to the cotton growth science, foliar fertilizer is selected. The cotton seedlings can spray 0.3% to 0.4% potassium dihydrogen phosphate solution or 2% borax solution. From July to late August, prevention of premature aging of leaves and stem blight, potassium chloride can be sprayed, a mixture of urea and borax 2, specifically the ratio: urea mu + potassium chloride 0.5 kg 0.01 kg 0.3 kg + water + borax 30 kilograms, spray 1 mu of land. These foliar fertilizers have low cost, good effect and significant increase in yield.
　　 2. The adhesion and absorption capacity of the back of the cotton leaf to the fertilizer solution is much larger than that of the front side. Therefore, the spray head should be flushed and the fertilizer sprayed on the back of the upper part of the cotton plant.
　　 3. After spraying time is usually 16:00 spraying sunny, cloudy day can be sprayed for 4 hours in case of rain fill spray after spraying, spraying twice interval of 7 to 10 days.
　　 4. The amount of spraying should be such that the fertilizer liquid is dripped on the back of the cotton leaf without dripping, and the amount of fertilizer used is 30 kg to 50 kg.
　　 5. To save spray mix with reasonable work, for spray application in conjunction with pest control spraying, careful not to acidic and basic drugs fertilizer, manure and acidic or basic drug mix jet, and flexibility needed pest control Spray.
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