Do a good job of cotton late ripening and improve cotton quality and benefit

For late-growing cotton fields and high-yielding cotton fields with late-maturing varieties, there are more autumn peaches. If the early frost comes early and the boll can not be opened normally before frost, ethephon should be sprayed timely and appropriately to promote early boll opening and improve yield and quality. Generally around October 1, ethephon is sprayed on sunny days when the temperature is above 20 ℃, with 40% ethephon 150 / mu and 50 kg water, spraying the whole cotton plant, focusing on the upper autumn peach. It can promote early opening and increase the yield. Matters needing attention: 1, the potion should be mixed with existing potions; 2 it should not be mixed with alkaline pesticides. In addition, a new type of cotton ripening agent "Tutuolong" can be used. Ethephon is often used to accelerate cotton ripening in the later stage, but its disadvantage is that it has no defoliation function and the ripening speed is slow. It begins to open bolls 15 days after use, and there are withered leaf residues, which is easy to pollute cotton wool due to withered leaf debris, resulting in poor cotton grade and low proportion of flowers before frost. The experimental results in recent years show that the above shortcomings can be avoided by using a new type of cotton ripening agent "Tutuolong" (made in Bayer, Germany). Its main advantages are: 1. Tuotuolong can quickly wither cotton, defoliate early and quickly, and take effect 10 days after use, quickly promote cotton ripening and boll fruit cracking, restrain greedy green, make cotton late autumn peach mature evenly in advance, and the ripening time tends to be the same, which is convenient for manual concentrated cotton picking. 2. After the cotton leaves fall off in advance, the ventilation and light transmission conditions of the cotton field can be improved, the rotten bolls can be reduced, and it is beneficial to the sowing and transplanting of the next crop, and is beneficial to the early and deep autumn ploughing. 3. It can promote the formation of detached layer at the base of cotton petiole in advance, make cotton leaves fall off before withering, avoid cotton wadding pollution by withered leaves and detritus, and continue to grow after defoliation, which can significantly increase the proportion of pre-frost flowers and thus improve the grade and yield of cotton. Suitable period for use: when the cotton leaves show senescence and the vegetative growth of the old peach enters a stagnant development period, the cotton leaves are easy to fall off, and there are still five unopened cotton peaches above the cotton main branch, which are generally sprayed 15 days before Frosts Descent (end of September and early October). Usage: use "Tuotulong" 4 grams per mu of cotton field plus professional auxiliaries and spray it with 30 kilograms of water.