Picking rotten bells: In order to reduce the loss, the cotton bolls with dark spots appearing in the early morning are soaked in 1% ethephon solution and then dried to obtain good cotton.
Strengthen the post-disaster management of cotton fields: Continue to do a good job of flood prevention, and continue to do a good job in preventing flooding while helping the disaster-damaged cotton fields to achieve a good degree of support and drainage and dehumidification.
Pruning: late pruning can improve the ventilation conditions of cotton fields, reduce nutrient consumption, beneficial to increase peaches, increase weight, promote early maturing, prevent rotten bell. For the late growing season, the closed cotton field, but also to play the old leaves, cut the empty branches, push the plant and ridge, prevent rotten bell.
Extra-root topdressing: The absorption ability of the root system of the cotton plant is weakened in the later period. To supplement the root system to absorb nutrient deficiency, extra-root fertilizer may be used. When cotton plants have defertilizers such as phosphorus deficiency and low potassium premature aging performance, generally 0.5% superphosphate solution per 667 square meters and 50kg 1% urea solution spray. For boron-deficient cotton fields, spray 50 kg of 0.2% borax solution per 667 square meters. Foliage dressing is best done in the sunny afternoon.
Control pests and disease prevention: After cotton enters the boll opening stage, there are more sudden diseases and insect pests. There are mainly four generations of cotton bollworms, which mainly affect summer cotton and late-maturing cotton. The harm of blind stink bugs continues until early October; bridge-building pests and beet nights Moths are emergent pests. The endangered period is from late August to early September. The above pests should be checked in time to grasp the hatching period for prevention and control. Before the third instar, the main pesticides are levosine and methoquinone salts. , Malathion, acephate, etc.; in addition, Bemisia tabaci, spider mites, thrips, etc., should be promptly controlled. Disease is mainly caused by the bell blight and other rotten bells, effective agent is mancozeb.
According to local conditions, corresponding ripening methods should be adopted: Due to various reasons, some cotton bolls in the late cotton field can not mature normally every year, especially summer sowing cotton, late-planting cotton, nested cotton and saline-alkali cotton and other late-maturing cotton fields. Not only affects the yield, but also reduces the quality. Therefore, the corresponding ripening measures can accelerate the development of cotton bolls and increase the production of the flowers before frost. Ethephon ripening is suitable for the general cotton fields and high-yielding cotton fields with more late Qingling and suitable time, generally in early October, with 40% water solvent, 150-200 ml per mu, 50-60 kg water. ,spray.
Timely collection: When cotton boils, if not picked in time, it will not only affect the yield, but also reduce the grade of cotton. About 7 days after the cracking of cotton, the best fiber quality, so the best time to pick a 7-10 days, premature fiber is not mature, moisture, bad basking, affecting the grade, too late cotton wool by the wind and rain Not only is it easy to be contaminated, but also the fibers are easily oxidized and become brittle and thick, which reduces the strength.
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