Detailed Explanation of Key Points of Scientific Chemical Regulation Technology for Cotton

Chemical regulation must be flexibly applied according to cotton growth conditions and weather conditions, focusing on vigorously growing cotton fields; when the soil is short of water and cotton growth is inhibited, it should be used sparingly or not at all. For cotton fields showing a tendency toward excessive growth at the full bud stage and early flowering stage, use 1.5-2.5 grams of mepiquat chloride per mu, diluted in 20-35 kg of water for spraying. For vigorously growing cotton fields at the full flowering stage, use 2-3.5 grams of mepiquat chloride per mu, diluted in 30-35 kg of water, sprayed on the surface of the cotton plants to control plant growth, so that the daily growth of the main stem is kept below 3 cm; 7-8 days after cotton topping, generally use 3 grams of mepiquat chloride per mu, diluted in about 30 kg of water, and spray it on the top and side buds of the cotton plants, which can simplify late-stage pruning, increase the setting of early autumn bolls, increase boll weight, and prevent delayed maturity due to excessive vegetative growth. After chemical regulation in vigorously growing cotton fields, management should also be strengthened, with attention to fertilizer and water management, so as to promote root growth below while controlling growth above. Prevent the situation where, after using the regulator, because the cotton leaves are dark green, no fertilizer is applied and no water is given, management is relaxed, resulting in premature senescence and reduced yield.