Chemical control agents commonly used in cotton production include dihydoamine, mesitride, ethephon, triacontanol, and chitin. Some of these chemical regulators can create ideal plant types to form high-efficiency groups per unit area; some can promote robust plant growth, reduce the occurrence of pests and diseases; some have ripening effect and can effectively regulate the maturity period, So as to reduce the danger of severe weather. In conclusion, various chemical control agents are used scientifically in cotton production to improve yield and improve quality. 1. Dydropenamine can reduce the plant height of cotton, reduce the number of fruit branches and boll shedding, increase the number of bolls, and can effectively coordinate the contradictions of individual development and population development, improve the photosynthetic efficiency, and promote high yield. Generally during the growth of cotton can be applied 4 times, the first time in the bud period, with 0.51 grams per 667 square meters of 20 kg of water spray, there is control on the promotion of stable growth. For the second time in the early flowering period, spray 1.5 kg of water to 30 kg per 667 square meters to prevent the growth of bells. The third time in the flowering and boll period, 34 grams of 30 kg of water was sprayed on the top of the crown and the top of the fruit section per 667 square meters to regulate plant growth. The fourth time was before entering the boll opening stage, there was a prosperous trend that could be re-controlled, with 34 grams of water per 667 square meters capped with 30 kilograms of water, in order to control the buds, shorten the upper fruit section, prevent no effect section proliferation and axillary bud clustering. 2. Not only can help to prevent insects, insect resistance and insect repellent, but also can control the cotton leggy, so that individuals grow cotton compact, robust, enhance plant physiological resistance and reduce the loss of boll bell. In order to improve the effectiveness of the booster prime application, it is necessary to look at the land and see the seedlings when applying. Generally, the “three types of seedlings†with poor soil, water shortage, and poor growth should not be used. The fertilizer and water conditions are good, and the performance can be practiced at the stage of budding and early flowering. Each 667 square meters is sprayed with 5 ml of 25% milk powder and 40 kg water. For every 667 m2 of flowering season, spray 20% of 10% of milk powder and 40 kg of water once. 3. Ethephon is mainly used for all kinds of late-maturing cotton fields and cotton fields that require ripening and early unloading. The spraying should be conducted at a temperature higher than 20°C to facilitate the release of ethylene. Use time and method: It is advisable to spray on the boll of the upper boll for more than 40 days. It is advisable to spray in the northern cotton zone about 20 days before the dry frost period. Generally, 40% ethephon agent (300-800) per 667 square meters. Double liquid 60 kg spray. Pay attention to the use of ethephon ripening, liquid medicine should be directly attached to the body of the bell to minimize cut-off by the leaf; can not be mixed with alkaline pesticides; for normal boll opening and low yield cotton fields and seed fields should not be used. 4. The use of triacontanol-triacontanol before sowing can increase the germination potential and germination rate of the seeds; the use of the late flowering stage and late flowering stage can reduce the shedding of the bells. The method was: soaking seeds with 0.1 mg/kg triacontanol for 8 hours before sowing; spraying with 0.1 mg/kg triacontanol solution at the end of flowering stage and flowering stage. When cotton is sprayed with triacontanol, it can also be mixed with pesticides (such as dimethoate) to control wheat aphids. For the late growth potential can be mixed with available fertilizers (such as urea, potassium dihydrogen phosphate, etc.) mixed spray. 5. Chitin can be used throughout the growing period of cotton. The early application can make the roots developed, the stems are robust, and the leaves are hypertrophic. The adverse effects of injury, fertilizer damage, and severe weather can be relieved, and the cotton stress resistance can be enhanced to promote balanced growth of the cotton. It is effective in preventing and controlling soil-borne diseases such as cotton damping-off, damping-off, anthracnose, and especially verticillium wilt. In the middle and late period, cotton buds are used for hypertrophy, bells are less, bolls grow faster, and the cotton quality is good. The use method is: seed dressing with 50 to 100 times the liquid, soaking for 12 to 20 hours, a little dry, you can sow; at the seedling height of 10 to 20 cm and the budding period can be used to irrigate the roots of 600 times each; middle and late 600 ~ 800 times can be sprayed 1 ~ 2 times. Skin Care Product,Led Light Therapy,Blackhead Remover Tool,Silicone Facial Cleanser Brush Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizonscare.com