The flowering and bolling period of cotton is a critical period for the formation of yields. In addition to good management of fertilizers and waters, the following points should be made:
Chemical regulation
During the flowering and bolling stage, the vegetative nutrients can be turned more towards reproductive growth and reduce the shedding of bells.
It is advisable to spray 2.0-2.5 g of metsalamine per acre on the stronger growing cotton field, or 8-10 millilitres of migliordin per mu. When the flower is full, it can be controlled once more according to the growing trend. Spray 2.5 to 3.0 grams of the dilute amine per acre, or 10 to 12 milliliters of the 20% of the metoprolol. The last chemical control should be 7-10 days after the cotton has been knocked off. After the top fruit branch has appeared in three fruit segments, it will be chemically controlled. Spray 3.5 to 4.0 g of azithramine per acre, or spray 25% of a metoprolol 14- 16 ml, focusing on spraying the side of fruit branches, 40-50 kg of mu spray solution. In order to seal the tip of the group, cut off the invalid buds and achieve the control effect of the four-door lock.
Timely heart-breaking
Appropriate topping time should be determined based on the cotton yield structure, combined density, number of branches per fruit, and growth at the time.
Under conventional density, 13-15 fruit branches are required for each tree, and they are topped around July 15th. The strong growing and low density cotton fields should be postponed to the top of July 20, but not later than the 25th, so that each cotton tree has an average of 17-18 fruit branches, in order to give full play to the fertility advantages of land and varieties. For cotton intercropping with cotton and dense or soil-constrained cotton fields, the top-down time should be completed early on July 10-13, otherwise the yield and quality will be affected. Topping up should be done with a method of hitting the top to prevent a lot of blemishes.
Disease prevention and pest control
The diseases occurring during the flowering and bolling period mainly include yellow, blight, red flag stem blight, cotton boll blight, black fruit disease, red rot, and pinkish pink disease. The cotton plants should be sprayed and sterilized at the beginning of August, with more than 50% of the bacteria. Spirit, 50% Tuzet, or 65% Zinc Zinc 400-500 times solution, use 40-50 kilograms per acre, once in 7-8 days, and end in the end of August. The diseased yellow and blight trees should also be combined with the method of irrigating the roots. The bacteria must be used for 300 times, and 200-250 milliliters of each solution should be poured into the tube. Once in 7-8 days, it can be 2-3 times. The main pests during the flowering and bolling period are cotton bollworm, fleas, blind pupa and red spider, etc. The damage is heavy and the production is a threat. Therefore, prevention and control should be carried out in time.
During the prevention and control, good strategies should be adjusted to distinguish the main prevention and control, scientific selection of pesticides, timely medication according to the hazard characteristics and activity patterns of pests, accurate drug use, and effective drug use.
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