How to manage the boll opening period of cotton?

How to manage the boll opening period of cotton? Please guide the cotton boll opening period can refer to the following methods for management: 1, skillfully grasp fertilizer and water to promote the movement of nutrients. One is extra-root topdressing. For cotton fields with premature loss of green leaves and early senescence, 50-60 kg urea solution of 1%-2% per mu was sprayed on the leaves to prolong the functional period of the leaves. For cotton fields that show greedy green and late maturity, 0.2% potassium dihydrogen phosphate solution or 0.3% calcium superphosphate leaching solution can be sprayed on the leaves to promote nutrient transport and improve boll opening. The second is to prevent autumn drought. 2. Pruning skillfully and pushing plants to promote maturity. Due to the limitation of temperature, the general "the Beginning of Autumn" after the bud and White Dew after the flowers, are invalid. The young part of the cotton plant should be removed in time, which can not only save nutrients, but also reduce the harm of the fourth generation of cotton bollworm. In the cotton field with severe closure, due to poor ventilation, some of the excess old leaves can be wiped out under the premise of 3 or 5 cotton leaves to protect a cotton boll. It is also possible to push plants and ridges, that is, the two adjacent rows of cotton plants are in a figure-of-eight shape together, and after an interval of 5 to 7 days, they are pushed aside on both sides. 3. Skillfully picking rotten bolls to improve quality. The cotton with better bolting can be obtained by dipping the picked cotton peach in 1% ethephon solution and drying it. 4. Timely ripening and early opening of catkins. When ethephon is sprayed at an appropriate time, cotton can open bolls about 10 days earlier, and the flowering rate before frost can be increased by 20% and 30%. During the spraying period, the cotton bolls in the upper part of the cotton plant should be more than 40 days long, about 20 days from the dry frost period, the spraying amount is generally 40% ethyl 150 grams per mu, and 50 times 100 times the water is evenly sprayed. If spraying early, the temperature is high, the cotton plant is weak, about 100 grams can be sprayed per mu. If it rains 6 hours after spraying, it needs to be re-sprayed (be careful not to spray in the field). Click to get more cotton planting technology click to get more food crop planting technology