Spraying nitrogen fertilizer: Urea has the function of destroying chitin of insects. When cotton aphids (especially voltain) occur, they are mixed with urea, washing powder and water in a ratio of 4:1:400 to prepare a "salt mixture" spray. Shi, has a clear killing effect.
Spraying phosphate fertilizer: In the occurrence period of adult cotton bollworm, 1% to 2% calcium perphosphate leaching solution is used for foliar spray fertilizer, which can change oxalic acid into calcium oxalate and lose the attracting power to cotton bollworm. The duration of each spraying of phosphorus is generally 2 to 3 days.
Spraying potassium fertilizer: 10 kg of grass ash, 50 kg of water, soaked for 24 hours, filtered, and the filtrate is sprayed, which can effectively kill the mites on the cotton. In the middle and late stages of cotton growth, foliar application of 1% to 2% potassium chloride (or potassium sulfate, potassium nitrate) solution can prevent or reduce the occurrence of cotton stem blight.
Spraying boron fertilizer: Boron fertilizer is one of the essential nutrients for cotton growth and development. It is sprayed with 0.2% borax (or 0.1% boric acid) solution in the cotton bud stage, early flowering stage and flowering and boll stage; Spray 15 to 20 kg, spray 35 to 40 kg at the initial flowering stage, and spray 50 to 60 kg during the flowering and ringing period.
Spraying copper fertilizer: using 1 part of copper sulphate, 1 part of lime, 200 parts of water, and is prepared into an equal amount of Bordeaux mixture. It can be sprayed at the seedling stage of cotton to prevent cotton seedling diseases; spraying in the flowering and ringing period can prevent ring disease. Reduce bad bells.
Spraying chlormequat: In the cotton bud period, for cotton fields with verticillium wilt, 50-75 kg of 50ppm chlormequat solution can relieve the disease.
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