At the moment, it is the vegetative growth of cotton that has entered the peak period and gradually turned to the stage of reproductive growth. It is also a period of absorption and absorption of fertilizer and water. After June 4th, there are many rainy days, the air humidity is very high, and the temperature is hovering at 25~30°C. Many old cotton field blights that have been planted for many years are induced. The rate of blight is generally around 5%, serious. The rate of diseased plants in the field is about 10%, and the incidence rate in some areas is about 20%. Some cotton field blind elephants, cotton bollworms, red spiders, and aphids are also harmful.
At the same time, for cotton with partial nitrogen fertilizer, under the harsh conditions of rain, the fertilizer water is extremely reversed, which is easy to cause madness. The average daily growth of main stems often exceeds 3 cm overnight. In this way, the cotton will be blocked prematurely, the cotton field will be severely shaded, and the buds will fall off a lot. In a few cotton fields with a lot of waterlogging, the cotton has been affected by drought and the ecological environment has worsened. Therefore, cotton areas in various regions should be adapted to the conditions of seedlings, strengthen the management of cotton bud period and flowering and boll period, and strive to resist the disaster and capture the harvest.
First, promote the combination of control and balance growth. For cotton seedlings that have not entered the bud stage, the quick-acting fertilizer should be applied to accelerate the growth rate of cotton seedlings. For cotton seedlings entering the bud period and flowering and bolling period, the application of high-content compound fertilizer and slow-release fertilizer should be applied, 15 to 25 kg per mu, and 15 kg of potassium fertilizer should be applied. Into, avoid boasting in the field. At this time, fertilization aims to make a cotton shelf early, so that cotton can be sealed in late July. For prosperous or mad cotton, try to use auxin or ketamine spray as soon as possible. In the early stage, 4 ml per acre or 1 gram of ketamine, and then gradually increase to 8 to 12 ml or 2 to 3 g. Last year, some farmers blindly increased their consumption and over-controlled, which led to a sharp decline in the rate of cotton.
Second, prevention and treatment of pests, safe growth. For cotton fields that have been wilted, the decomposed organic fertilizer, bio-organic compound fertilizer should be added, potassium fertilizer should be added to enhance the defense and recovery ability of Fusarium wilt, and some pesticides that relieve wilt disease can be sprayed, such as grams. Yellow dry and so on. For the insect pests that have been seen, it is mainly to prevent blindness and to treat other pests. You can choose 20 to 30 ml per mu or 2% emamectin benzoate wettable liquid. 5000 times liquid, or 1500-2000 times liquid of acetamiprid 3% emulsifiable concentrate, or 1500 times liquid of imidacloprid wettable powder.
Third, Shu Li "four ditch", rain live in the field. For the furrows, trenches, lumbar sulcus and surrounding drainage ditch of cotton fields, 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 board and loosen the soil after the rain, and raise the soil to prevent lodging.
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