Cotton anaphase management

In autumn, the growth of cotton turned to the late growth stage of opening bolls and completing the development of autumn peach. This period takes root and leaf protection as the center, with scientific management means to promote the healthy growth of cotton plants, prevent premature senility and greed for late ripening and rotten peaches, and strive for a bumper cotton harvest. The specific management methods are as follows.

1. After resisting drought and waterlogging, the Beginning of Autumn often has a serious drought. During the period from mid-August to mid-September, the soil water content of 040 cm should be kept at more than 55% of the field capacity. Only under sufficient water conditions can cotton grow and develop normally. All physiological functions can be carried out normally. No water equals no fertilizer, and the amount of ethylene produced by cotton plants is greatly increased, resulting in a large number of flowers and bolls shedding and premature senescence. Therefore, if it is lower than this index, it is necessary to pour small water or interline watering, and avoid flooding or soaking, so as to keep cotton field drainage unimpeded, so as not to affect the vitality of the root system. At the same time, pay attention to the rainstorm and excessive autumn rain on cotton waterlogging, do a good job of ditch drainage, in order to maintain the root system and reduce rotten bolls.

two。 In the cotton field after rain or watering, the ground is hardened, the permeability is poor, and the root activity decreases, so we can use animal power shallow ploughing or artificial hoeing (loose soil should be shallow rather than deep) to break soil consolidation and improve soil permeability. and it can increase the soil temperature and promote the growth of cotton root system. At the same time, combined with loosening soil and cultivating soil and choking roots, the lodging resistance of cotton can be effectively enhanced.

3. Extra-root topdressing makes full use of the absorption function of leaves to spray fertilizer on the leaf surface to make up for the deficiency of root absorption of nutrients, improve the photosynthetic capacity of leaves, and improve boll rate, yield and quality. Re-application of flower and boll fertilizer to meet the nutrient needs of a large number of cotton blossoms and bolls; supplementary application of peach fertilizer, due to the high peach rate of insect-resistant cotton, early fertilizer peak, high demand for potash fertilizer, has consumed a lot of nutrients, many cotton fields have appeared the phenomenon of lack of fertilizer and early senescence. If you do not replenish nutrients in time, it is difficult to achieve the top of autumn peach; timely spraying fertilizer to prevent premature senescence, from August to the first ten days of September, every 5-6 days, spray 1% urea solution, 667 square meters about 100 kg. Focus on spraying on the back of the middle and upper leaves. Sunny days after 4 pm spray, cloudy days can be carried out throughout the day, do not spray in high temperature, strong light, so as not to spray water evaporation too fast, a sharp increase in concentration of leaf burning phenomenon.

4. Timely topping and pruning cotton into the bud stage, we should properly remove 4 and 5 early buds on the first and second layers of fruit branches, promote cotton to build early high-yield racks and concentrate on peaches; removing the top before the Beginning of Autumn can effectively restrain the ineffective growth of the upper part of cotton and improve the ventilation and light transmission conditions in the field. promote the upper young buds to bear peaches normally and increase the number of autumn peaches. Wipe off the superfluous buds in time after topping. Pruning should be done in time to promote the transformation of nutrients to reproductive growth so as to achieve the purpose of protecting young bolls and increasing boll weight. Remove the ineffective old leaves at the bottom of the cotton, take the waste branches and leaves full of pests out of the cotton field, dig holes and bury them deeply, so as to reduce the number of pests in the cotton field.

5. To prevent greedy green late-maturing cotton from growing too large, too much nitrogen fertilizer, too late, too exuberant cotton plant growth can easily lead to greedy green, late ripening, late autumn peach, cotton peach can not crack normally, affecting cotton quality, at this time, ethephon should be sprayed to accelerate ripening. When applying ethanolide, it should be applied before and after "Cold Dew" to "Frosts Descent", when the average temperature is more than 20 ℃ for 3 consecutive days, and when the cotton boll period is more than 40 days. 667 square meters with 40% ethephon 100g 150g plus water 50kg spray.

6. According to the forecast of plant protection stations, all localities should focus on the prevention and control of diseases and insect pests such as Verticillium wilt, cotton bollworm and red spider. Cotton aphid, cotton bollworm and other pests have strong drug resistance, so we should pay attention to the mixed and rotational use of drugs in the control. As yellow leaf blight is a physiological disease characterized by malnutrition and potassium deficiency, lack of organic fertilizer, barren and drought are the main causes of the disease in general cotton fields. Therefore, the methods of supplementary application of potash fertilizer and foliar spraying fertilizer can be used in prevention and control.