Cotton leaves are the most important organs of nutrition cotton, with photosynthesis, respiration, transpiration, absorbing four kinds of action. Using its absorption and photosynthesis, targeted to improve Yemianpenfei, can promote healthy plant growth, enhance disease resistance, insect resistance, resistance to drought, premature aging, regulate vegetative and reproductive growth, significantly increase production 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 an 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. Reasonable mixing to save labor, foliar spray fertilizer combined with insect-proof spray, pay attention not to mix acid fertilizer with alkaline drugs, or alkaline fertilizer and acid drugs, and flexibly control the spray according to the needs of pest control Shi.
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