Cotton leaf spray fertilizer remember five points
Cotton leaf is the most important vegetative organ of cotton, which has four functions: photosynthesis, respiration, transpiration and absorption. Making use of its absorption and photosynthesis, foliar fertilizer spraying can promote plant growth, enhance disease resistance, insect resistance, drought resistance and premature senility resistance, regulate vegetative growth and reproductive growth, and greatly improve yield and quality.
1. The type of spraying is based on the scientific selection of foliar fertilizer according to the growth of cotton. The prosperous growth of cotton seedlings can be sprayed with 0.3%-0.4% potassium dihydrogen phosphate solution or 2% borax solution. From July to late August, the mixture of potassium chloride, urea and borax can be sprayed twice to control red leaf stem blight and premature senescence. The specific proportion is as follows: 0.5 kg of potassium chloride + 0.3 kg of urea + 0.01 kg of borax + 30 kg of water per mu. These foliar fertilizers have the advantages of low cost, good effect and significant yield increase.
two。 In the spraying part, the adhesion and absorption capacity of the back of the cotton leaf to the fertilizer liquid is much greater than that of the front, so the sprayer head should be flushed up during the operation, and the fertilizer liquid should be sprayed on the back of the middle and upper leaves of the cotton plant.
3. The spraying time is generally after 4: 00 p. M. on a sunny day, and can be sprayed all day on a cloudy day. 4 hours after spraying, there is a supplementary spray in case of rain. The interval between the two sprays is 7-10 days.
4. It is appropriate to spray the amount of fertilizer liquid on the back of cotton leaves, and the amount of fertilizer liquid per mu is 30 kg ~ 50 kg.
5. In order to save labor, foliar fertilizer spraying and pest control spraying should be combined. Be careful not to mix acidic fertilizer with alkaline medicine, or alkaline fertilizer with acidic medicine, and flexibly control spraying according to the needs of pest control.
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Cotton management after topping in July
After the cotton is topped, it is generally controlled for 1 or 2 times. For the first time, in 3-5 days after topping, fields with 667 square meters of seedlings of about 12000 plants were given 4-5 grams of promethamine and 30 kilograms of water. The following technical measures should be taken after cotton topping in July. First, scientific control 1. After cotton topping is regulated according to the growth trend, it is generally controlled for 1 to 2 times. For the first time, three to five days after topping, the fields with 667 square meters of seedlings protected at about 12000 plants, 4 grams of promethamine and 30 thousand water.
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Spraying zhuangsu on cotton has many benefits.
Zhuang Su is a special growth regulator for cotton, which can control the overgrowth of cotton, regulate the distribution of nutrients and improve the boll setting of cotton. In September, the growth and development of cotton is in the late boll-setting stage, so proper spraying of zhuangsu, 20ml per mu, can reduce the occurrence of invalid buds. After spraying cotton, the leaf color increases, the mesophyll thickens, which can effectively improve the photosynthesis of cotton. After spraying zhuangsu, the fruit branches of the upper part of cotton can grow old and healthy, and the effects of insect pests such as cotton bollworm and Spodoptera litura are reduced. At the same time, it has been affected by the climate in recent years.
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