Anti-premature aging in cotton

Cotton (19695, 0.00, 0.00%) premature aging refers to premature aging and shedding of leaves due to various reasons during the late growth period of cotton. The bells are less and less, the cotton bolls are small, not full, the fibers become shorter, the pulling force decreases, and the cotton yield is seriously affected. Improvement. The economic income has decreased and the economic benefits of cotton fields have declined. In order to prevent premature aging of cotton and increase production, it is an urgent problem to be solved in cotton production.
The main causes of premature aging of cotton: 1. Root injury is prone to premature aging. Cotton seedlings have long waterlogging time, soil compaction, poor gas permeability, poor root development, growth retardation and premature aging; excessive use of herbicides, damage to cotton roots, less cultivating soil during bud stage, underdeveloped root system, soil conservation and drought resistance Poor premature aging. 2. The lack of fertilizer and water is prone to premature aging. There is no organic fertilizer in the cotton field for a long time, lack of organic matter and trace elements in the soil; insufficient amount of base fertilizer, less application of flower and bell fertilizer, poor quality of fertilizer; late application of flower and bell fertilizer, insufficient soil moisture, no effect of fertilizer effect, long drought time , lack of nutrition and premature aging. 3. Sudden pests and diseases are prone to premature aging. For example, tweed leaf moth, cotton aphid and red spider are seriously harmful, cotton leaves are eaten or shed by a large amount; yellow blight is not cured in the seedling stage, and red leaf blight is prone to occur when the temperature and humidity are suitable after autumn; high temperature and drought, occasional irrigation The artificial large water soaking, the cotton due to "water poisoning" caused the leaves to fall off a lot and prematurely decay.
Control measures: 1. On the pruning, the cotton fields that may have premature aging are no longer finely pruned, and some axillary buds can be retained to ensure that there are enough vegetative organs in the cotton field for photosynthesis. 2. Immediately after the topping, spray the foliar fertilizer, 8~10 days, first nitrogen and then potassium. Once de-fertilized, it is difficult to achieve the top of the autumn peach. At the end of the period, two times of quick-acting potassium fertilizer is very important for the upper multi-bell, bell, and feces. Potassium is indispensable for cotton fiber development, so potassium can increase nutrients. Especially for low-lying cotton fields, spraying potassium is more necessary. It can also be combined with pest control to spray once every 7 to 10 days with 2% to 3% urea plus 0.2% potassium dihydrogen phosphate. 3. Pay attention to the topping of fertilizer: For early sowing, early development, early drought, cotton fields in front of the peaches, it is necessary to apply topping fertilizer. 4. Pest control. Timely prevention and control of Fuxi, spider mites, cotton blind mites and yellow wilt, etc., different types of agents are used alternately or mixedly. 5. Break the knot. Futian Yuyu should be ploughed in time to break the soil compaction, in order to facilitate root growth, nutrient absorption, and cultivating should not be too deep, so as not to hurt the roots.