Cotton management after topping in July
After the cotton is topped, it is generally controlled for 1 or 2 times. For the first time, three to five days after topping, a field with 667 square meters of seedlings of about 12000 plants was given 4-5 grams of promethamine and 30 kilograms of water.
The following technical measures should be taken after cotton is topped in July.
1. Scientific control
1. Depending on growth regulation
After the cotton is topped, it is generally controlled for 1 or 2 times. For the first time, three to five days after topping, the fields with 667 square meters of seedlings with about 12000 plants were given 4 grams of propranolol and 30 kilograms of water, while the fields with more than 16000 plants were given 6 grams of thalidomide and 40 kilograms of water. The second chemical control depends on the ontogeny and population size of cotton plants, and moderate re-control is carried out according to the weather, soil moisture and cotton plant growth, generally 667 square meters of about 8 grams of propofol. Through the effect of propranolol, we can effectively control the growth tip of invalid flower buds and empty fruit branches, realize the transformation from vegetative growth to reproductive growth, shape the growth appearance of balanced yield, and ensure the increase of boll number and boll weight at the top of cotton plants. to create conditions for high yield.
two。 Spray properly
The correct way to spray propranolol is to first dissolve it in a weighed basin or plastic bucket container, stir it fully, and add it to the sprayer according to the amount of thalidomide per 100 grams of acetylamine aqueous solution.
Spraying propranolol should grasp the principles of evenness and dissatisfaction, high spray but not low spray, spray prosperity without spray failure, and the best spray should be carried out after 5: 00 p.m. Spraying under high temperature and strong light will reduce the effect, rain within 6 hours after spraying will affect the absorption effect, large rainfall for a long time will be ineffective, need to re-spray.
Second, irrigation according to local conditions
After topping, cotton enters the peak period of reproductive growth, and flowers, buds and bolls are gradually formed. this stage is the stage in which cotton needs the most water in the whole growth period. in the cotton field under conventional furrow irrigation, the first water should be less and the second water should be full. three and four water should be sufficient (three and four water is the two water after topping). The water must be stopped before August 15 to prevent cotton plants from ripening late.
Third, look at the appearance to replenish the fat.
Cotton needs more water and fertilizer after topping. In the cotton field under conventional irrigation, different amounts of nitrogen, phosphorus and potassium fertilizer should be applied according to the appearance of branches and leaves of cotton plant after topping, 5kg / 667 square meters. At the same time, increase the spraying of foliar boron fertilizer, 50 grams of Suele boron is dissolved in 50 kilograms of water spray every 667 square meters, a total of 2 times, in order to improve the boll setting rate.
IV. Timely harvest
After opening catkins, we should adhere to the "three whiteness", and achieve graded flower picking, graded heap drying, graded selling, to ensure cotton quality and quantity, high yield and bumper harvest.
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How to manage cotton after topping in July
Heat or high temperature and humidity is one of the most harmful factors in the breeding industry, which will lead to the occurrence of heat stress syndrome in livestock and poultry. Heat stress suppresses the immune function of the body, reduces the concentration of immunoglobulin in blood and the number of lymphocytes in blood, resulting in the decrease of phagocytosis of macrophages in the body and infectious diseases of livestock and poultry. Therefore, heat stress will make livestock and poultry prone to all diseases. As the higher the production performance of modern excellent livestock and poultry breeds, the worse the ability to resist heat stress, serious heat stress often causes the livestock and poultry with high performance to die first, resulting in serious economic losses. Improve the performance of livestock and poultry
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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 can be selected scientifically according to the growth of cotton, and the vigorous growth of cotton seedlings can be sprayed with 0.3%-0.4% potassium dihydrogen phosphate solution or 2% borax solution.
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