Spray copper fertilizer with 1 part of copper sulfate, 1 part of lime, and 200 parts of water. Formulated with equal amount of Bordeaux mixture. Spraying at the seedling stage of cotton can prevent diseases of cotton seedlings. Spraying at the boll stage can prevent and cure boll disease and reduce rottenness. bell.
Spraying boron fertilizer on cotton buds, early flowering stages, flowering and bolling stage, spraying with 0.2% borax (or 0.1% boric acid) solution; 15-20 kg per acre during the bud stage, and 35-40 kg during the early flowering period. Spraying 50-60 kilograms during the flowering and bolling period can effectively prevent the shedding of the bells, promote more bells and knot the bell.
Spraying nitrogen fertilizer in the occurrence of cotton aphids, using urea, washing powder, water mixed in a ratio of 4:1:400 formulated as "wash urine mixture" spray, with a clear kill aphid effect.
Phosphate fertilizer spraying in the adult stage of cotton bollworm, with 1% to 2% of superphosphate soaked liquid foliar spray fertilizer, oxalic acid can be changed to calcium oxalate and lost the lure to the cotton bollworm. This average can reduce the amount of eggs falling in the field of 55%; the duration of each spray of phosphorus is generally 2 to 3 days.
Spraying potassium fertilizer is a kind of high-quality potassium fertilizer. It uses 10 kg of plant ash and 50 kg of water. After soaking for 24 hours, it is filtered and the filtrate is sprayed. It can effectively kill aphids on cotton. During the middle and later stages of cotton growth, spraying 1%-2% potassium chloride (or potassium sulfate, potassium nitrate) solution on the leaves can prevent or reduce the incidence of cotton stem blight.
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