In order to ensure the stable production and increase of cotton production in China this year, according to different cotton production conditions and climate characteristics, the cotton expert steering group of the Ministry of Agriculture put forward the guiding technical advice for the post-management of the cotton fields in the Yangtze River Valley.
The cotton fields in the Yangtze River Valley have suffered from severe weather such as heavy rain and high temperatures during the middle period of cotton growth, and some cotton fields show a tendency of premature aging. All localities must make full use of favorable weather conditions with adequate light and suitable temperatures at the end of the production period to strengthen production guidance and to increase the number of autumn peaches to reduce the impact of bad weather on cotton production and quality.
Top dressing pruning. From late August to late September, use 0.3% potassium dihydrogen phosphate for foliar dressing and spray every other week. For potassium deficiency and boron deficiency cotton fields, topdressing potash fertilizer and boron fertilizer are applied in a timely manner to supplement late nutrients and prevent premature budding of cotton buds. Timely removal of ineffective shoots, middle and lower old leaves, axillary buds, enhanced ventilation and light transmission, increased the rate of ringing in the upper part of the cotton plant and the boll weight, and prevented the occurrence of rotten bells. Disaster Prevention and Mitigation All localities shall make plans for disaster prevention and relief, clear up the three trenches inside and outside the cotton field in advance, and timely collect waste water in the cotton fields. If the typhoon causes lodging, it is necessary to take care of the cotton plants in time, loosen the soil and cultivate soil at the right time, and improve the breathability of the cotton fields. Pay close attention to the occurrence of four-generation pests such as cotton bollworm, red spider, cotton aphid, and whitefly, and treat the insects in a timely manner.
Ripening and harvesting. From the end of September to mid-October, when more than 80% of cotton bolls reached 45 days, select sunny days above 20°C and spray ethephon to mature them. The proposal is divided into two parts. The first time the cotton plant is sprayed in the middle and the lower part, and the second time after one week, the upper part of the cotton plant is sprayed. For late-late-onset late-onset, late-autumn, late-growth cotton fields, or late-stage, low-temperature, rain-shrouded, and incapable of cracking and opening, cotton fields can be sprayed with ethephon to promote rapid maturation. In the aspects of seed cotton harvesting, drying, and packaging, it is necessary to maintain the distribution, splitting of drying, storage and distribution, and eliminate the incorporation of heterosexual fibers such as “three wiresâ€.
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