The boll opening period refers to the period from the time when the cotton is spun to the end of the harvest. Before the cotton bolling this year, most of the cotton area has more rain. Due to the excessive humidity, some cotton fields are lodging and rotten. The management points of the cotton field after the bolling are as follows:
Grab the rotten bells: In order to reduce the losses, the cotton bolls with dark spots on the lower part are backed up early, and then dipped in a 1% ethephon solution and then air-dried to obtain good cotton.
Strengthen post-disaster management of cotton fields: continue to do a good job of flood control, and continue to do a good job in preventing floods while doing a good job of flooding the affected cotton fields and draining and dehumidifying.
Pruning: Late pruning can improve the ventilation and light transmission conditions of cotton fields, reduce nutrient consumption, and increase the autumn peach, increase the weight of the bell, promote early maturity, and prevent rotten bells. For the cotton fields that are growing in the late stage and closed in heavy weight, it is necessary to fight the old leaves, cut the empty branches, push the plants and ridge, and prevent the rotten bells.
Top dressing: The absorption capacity of roots in cotton plants is weakened in the late stage. In order to supplement the roots, the nutrients are insufficient. When the cotton plant has de-fertilization such as phosphorus deficiency and potassium deficiency, it is generally sprayed with 0.5% superphosphate solution and 50% of 1% urea solution per 667 square meters. For the boron-deficient cotton field, spray 50 kg of 0.2% borax solution per 667 square meters. Foliar topdressing works best on sunny afternoons.
Insect control and disease prevention: After the cotton enters the boll opening period, there are more sudden pests and diseases, mainly four generations of cotton bollworms, which mainly endanger summer cotton and late-maturing cotton. The harm of blind elephants continues until the beginning of October; bridge-forming insects and beet nights Moths are sudden pests. The hazard period is from late August to early September. The above pests should be inspected in time to seize the hatching period for prevention and control. Before the third age, the main pesticides are Benzene and A. , malathion, acephate, etc.; in addition, beech, red spider, thrips, etc., should be timely prevented. The disease is mainly a rotten bell caused by a bell disease, and the effective control agent is mancozeb.
According to local conditions, the corresponding ripening method should be adopted: due to various reasons, some cotton fields in the late cotton field can not mature normally every year, especially summer cotton, late cotton, cotton planting and saline-alkali cotton, etc. 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 pre-frost flower yield. Ethephon ripening, suitable for general cotton fields and high-yield cotton fields with more Qingling bells. Use suitable time, generally in early October, use 40% water solvent, 150-200 ml per mu, 50-60 kg water. ,spray.
Timely collection: When cotton is vomited, if it is not picked in time, it will not only affect the output, but also reduce the cotton grade. About 7 days after cotton cracking, the fiber quality is the best, so it is best to pick it once in 7-10 days. The fiber is immature, the water is too big, the flower is not good, and the grade is affected. The cotton wool is affected by the wind and rain. Not only is it easy to be contaminated, but the fiber is easily oxidized, becomes brittle, thickens, and reduces strength.
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