Spraying nitrogen fertilizer urea has the effect of destroying the chitin of insects. When the cotton aphids (especially volts) occur, they are mixed with urea, washing powder and water in a ratio of 4:1:400 to form a â€œwashing urea mixtureâ€ spray. , has a clear killing effect.
Phosphate fertilizer spraying in the adult stage of cotton bollworm, with 1% ~ 2% of superphosphate soaked liquid foliar spray fertilizer, make the amount of eggs fell 33.3% ~ 73.4%. The duration of each spray of phosphorus is generally 2 to 3 days.
Spraying potassium fertilizer is a kind of high-quality potassium fertilizer, but also contains phosphorus, calcium, magnesium, sulfur and boron, manganese, copper, zinc, molybdenum and other nutrients. 10 kg of plant ash, 50 kg of water, soaked for 24 hours, filtered, and the filtrate sprayed, can effectively kill the aphid on the cotton. In the late stage of cotton growth, foliar spray of 1% to 2% potassium chloride solution can prevent or reduce the incidence of cotton stem blight.
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