Foliar spray fertilizer is a fertilization method often used in cotton production. Properly sprayed fertilizer can not only supplement nutrients, regulate growth, increase yield, but also treat some pests and diseases, so as to achieve a multi-effect and multi-effect.
Spraying nitrogen fertilizer urea has the effect 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 "washing mixture" spray. With a clear killing effect.
The oxalic acid secreted by the glandular hairs on the tender head of the phosphate fertilizer has an attractive effect on the cotton bollworm moth. In the adult period of cotton bollworm, 1% ~ 2% calcium perphosphate leaching solution for foliar spray fertilizer can make oxalic acid become calcium oxalate and lose the attraction to cotton bollworm. In this way, the amount of eggs in the cotton field can be reduced by 33.3% to 73.4% , with an average of 55% ; the duration of each spraying of phosphorus is generally 2 to 3 days.
Spraying potassium fertilizer is a kind of high-quality potassium fertilizer. It also contains phosphorus, calcium, magnesium, sulfur and various nutrients such as boron, manganese, copper, zinc and molybdenum. Use 10 kg of grass ash to 50 kg of water , soak for 24 hours, filter, take the filtrate spray, can effectively kill the mites on cotton. In the middle and late stages of cotton growth, spraying 1 ~ 2% potassium chloride (or potassium sulfate, potassium nitrate) solution on the foliage can prevent or reduce the occurrence of cotton stem blight.
Spraying boron fertilizer Boron is one of the nutrients necessary for cotton growth and development. If the soil is insufficiently supplied with boron, it will make the cotton "bud without flowering", the bell is small and small, and the yield is low. In the cotton bud stage, the initial flowering stage, and the flowering and boll stage, the solution was sprayed with 0.2% borax (or 0.1% boric acid) solution. During the bud period, 15 to 20 kilograms per acre are sprayed , 35 to 40 kilograms are sprayed at the initial flowering stage, and 50 to 60 kilograms are sprayed during the flowering and bolling period , which can effectively prevent the buds from falling off, promote multi-ringing and knotting large bells, and increase the yield.
Copper sulfate fertilizer by spraying 1 part, 1 part lime, 200 parts of water, formulated in the same amount Bordeaux mixture, sprayed on cotton seedling, can prevent cotton Fusarium; spray blooming period, the bell can prevent disease, to reduce the Rotten bell.
Spraying Cycocel reported in the cotton bud stage, suffering from verticillium wilt of cotton, 50 acres of spray solution Cycocel 50ppm to 75 kg, can alleviate the condition, and increase 10% to 29%. (Wang Yutang, Agricultural Bureau of Dongping County, Shandong Province)
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