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Management of Cotton Fields after Drought and Flood Crisis
Right now, it is the period when the growth of vegetative growth of cotton reaches its peak and gradually shifts to the stage of reproductive growth. It is also a time when the absorption of fertilizer and water is more and more sensitive. After June 4th, overcast and rainy days, the air humidity is very high, and the temperature hovering at 25 to 30°C. Many wilts from the old cotton fields that have been planted for many years have been induced. The rate of wilt disease is generally about 5%. The disease rate of field plots is about 10%, and the incidence in some plots is about 20%. Some cotton grasshoppers, cotton bollworms, red spiders and aphids are also spotted. At the same time, for the partial application of nitrogen fertilizer, under extreme rainfall conditions, the fertilizer and water reversed extremely and could easily cause madness. The average daily growth of the main stem was often more than 3 cm overnight. In this way, cotton will be prematurely sealed, the shading of cotton fields will be severe, and a large amount of bells will fall off. In some cotton fields that have been affected by flooding, cotton has been plague-fighted after drought and the ecological environment has deteriorated. Therefore, cotton areas around the country should be adapted to the conditions of the seedlings, strengthen the management of cotton buds and flower bell period, and strive to win the harvest. First, to promote control and balance growth. For the cotton seedlings that have not entered the bud stage, the quick-acting fertilizers should be used mainly to accelerate the growth rate of the cotton seedlings. For the cotton seedlings entering budding and flowering boll, high-level compound fertilizer and slow-release fertilizer should be applied, with 15 to 25 kg per mu, and 15 kg of potash fertilizer should be used in addition to spreading the ditch or beating a hole. Into the field, bogey in the field. At this time, fertilization is aimed at catching up with the high yield shelf of cotton, so that cotton can be sealed in late July. For the prosperous or mad long cotton, as soon as possible to use Chomstone or polycysteamine spray, pre-male 4ml per mu or 1 kg of dildoamine, and then gradually increase to 8 to 12 ml or 2 to 3 grams Last year, some rural households blindly increased their use of excessive amounts of chemical fertilizers, resulting in a sharp drop in the percentage of cotton crops that must be learned. Second, disease prevention and pest control, safe growth. For the wilt-blasted cotton fields, decomposed organic fertilizers and bio-organic compound fertilizers should be added, and potassium fertilizers should be added to increase the defense and recovery ability of the wilt disease, and some pesticides that can alleviate wilt disease, such as g Yellow withered etc. For the pests that have been seen, the main pests should be anti-blindness and treat other pests. The use of extinction (speed) blind tadpoles may be 20 to 30 milliliters per mu, or 2% emamectin benzoate wettable liquid 5000 times liquid agent, or acetamiprid 3% EC 1500 to 2000 times, or imidacloprid WP 1500 times. Third, to clear up the "four ditch," rain live dry. For the furrows in the cotton field, the car ditch, the waist ditch and the surrounding drainage ditch, it should be thoroughly cleaned so that the stains can be discharged and the drought can resist. At the same time, it is necessary to break the planks after the rain and start soiling to prevent lodging.