Cotton wants to increase production. In addition to the scientific topping, we must do the same. The friends who grow cotton know that cotton topping can reduce the effectless branch and significantly increase the yield. The key to increasing cotton production is the time and method of topping; therefore, it is necessary to skillfully carry out field management of controlling, topdressing and watering. The following will give a detailed introduction for your reference. First, the best time for cotton topping In general, cotton has always been said to be "concave early, convex late, flat top to be right", "when time is not equal, branches are not equal", the normal topping time is about 90 days before the frost It is advisable that the effect of topping the production too early and too late is not good. There are three criteria for the most scientific period of cotton topping: 1 the top of the cotton plant is at the same time as the top two leaves; 2 plants are 60 cm high; 3 knots are 8-12 fruit; about mid-47. The premature sign is that the top of the cotton plant is lower than the top 1-2 unfolded leaves, and the sign of the top of the night is when the top of the cotton plant is higher than the top two leaves. However, the cotton topping time should be flexibly controlled according to the actual situation and weather of the cotton field: cotton fields with weak growth potential, high planting density, poor water and fertilizer, low temperature and rainy years, and short growth period, it is best to top early; strong growth, planting For cotton fields with low density, good water and fertilizer, high temperature and dry years, and long growing varieties, it is best to delay the topping time appropriately. Cotton should increase production, and we must do these after the scientific topping! You certainly don't know! Second, scientifically determine the amount of cotton plant residues 1. Description of the number of remaining fruit branches: short-growing varieties, strong growth, low planting density, high water and fertilizer, can leave more fruit branches; 2, the situation of less remaining fruit branches: long growing varieties, planting density, weak growth, low water and fertilizer land, you can leave less than a few fruit branches. 3, the middle and lower part of the cotton plant with more bells, the upper part should leave less fruit branches; the middle and lower part of the cotton plant with less bells, the upper part should leave more fruit branches. 4. Generally, there are more hybrid cotton knots, which can leave more fruit branches than conventional cotton. Third, cotton topping needs attention 1, topping method When the cotton is topping, remove the top of the leaf. If different plots are topped, you should first hit the weak cotton fields and then fight the strong cotton fields. If the same cotton field is topped, you should top the trees regardless of the size of the trees. Do not fight in batches, and do not miss each Tree. 2, after the topping control In general, it takes 1-2 times to control the cotton after it has topped. Cotton plants with weak growth, high planting density, poor water and fertilizer, concentrated buds, and flowering to the top of the cotton, the first control can be 5-7 days after the topping, 4-5 grams of acetaminophen per acre 30 The amount of kilograms can be applied to the top of the cap, which can control the ineffective flower buds, reduce the axillary buds, shape the plant shape, and increase the yield per mu. The second control can be moderately weighted 5-7 days after the first dose. Control, 8-10 grams of aquarium can be sprayed with 30 kilograms of water per acre; but if the growth of the cotton plant is too strong, the second dose can be appropriately increased, the amount of drug can be increased after 7 days of topping. Use 15-20 grams of ketamine. 3, topping after top dressing After the cotton is topped, it should be properly topdressed according to the growth situation. Generally speaking, ordinary cotton fields can be applied with 5-8 kg of compound fertilizer per mu, and cotton fields with heavy salinity can be applied with 3-5 kg ​​of compound fertilizer per acre. In addition, boron fertilizer should be applied during topdressing. After melting with 50 g of boron fertilizer in warm water, spray 1 mu of cotton field with 50 kg of water, and spray twice, in order to increase the yield of cotton planting on the basis of supplementing boron nutrition. 4, watering after topping Generally speaking, cotton topping quickly enters the stage of reproductive growth of flowers, buds and bells. This period is also the peak period of water demand during the whole cotton growing period. After the topping, water should be poured in time. When watering, it is necessary to pour small water to avoid a large amount of watering. The principle of “one water is less, two waters are full, and three or four waters are sufficient (three or four waters refer to the second water after topping)†However, the watering should be stopped according to the late growth of cotton, so as not to cause late maturity of cotton plants. 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