Cotton generally begins to bleed at the end of August and early September, lasting 70 to 80 days. In the management of the boll opening period, cotton fields should prevent premature aging, and high-yield cotton fields should prevent late maturity and promote early maturity.
1. Spraying foliar fertilizer: The root activity of the cotton boll opening period is gradually weakened, and the ability to absorb nutrients is significantly reduced. For cotton fields with de-fertilization, 1% urea solution and 0.5% superphosphate solution should be sprayed 1~2 times to improve the photosynthetic efficiency of leaves, promote cotton boll development, increase yield and improve cotton fiber quality.
2, drought and flood control: Although the cotton boll opening period requires less water, but the appropriate water is still a guarantee to improve production and quality. Therefore, it is necessary to encounter drought and watering. When watering, use a small ditch to avoid flooding. Watering time should not be too late, so as not to cause cotton to be late and ripe. In case of damage, it is necessary to drain in time.
3, adjust the shape of the plant: cotton into the boll opening period still need to continue to do the old leaves, cut empty branches, to axillary buds, remove the rotten bells, etc., especially for the later growth of more prosperous, greedy and late mature cotton, should pay more attention In order to improve the ventilation and light transmission conditions in the field, the nutrient is concentrated to supply the knotted cotton boll, so that it can mature early and reduce the rotten bell. When the rain is heavy and the humidity is high, the measures of ridges can be adopted. That is, when the soil is wet, the two adjacent rows of cotton are pushed together to form an "eight" shape, so that the two rows of cotton are joined together on both sides and rows. Ample light can be obtained from the ground to achieve the purpose of ventilation, light transmission and temperature reduction.
4, picking old ripe peaches, chemical ripening: If the cotton spit floes in the early rainy days, early cotton fields will appear rotten bells, in order to reduce losses, you can pick up more than 40 days of cotton bolls in advance, with 0.5% to 1% After the ethephon solution is sprayed or soaked and aired, a normal bollworm boll can be obtained. For the late autumn peaches, the cotton bolls can not develop normally and mature bolls, resulting in a small proportion of cotton before the frost, affecting the cotton fields of autumn tillage and sown crops, can be ripened with ethephon. In the 20 days before the frost, choose sunny days, use 40% of the ethephon solution of 100% to 200ml per mu, and spray the cotton plant with 50kg of water, which can be bolled 8~15 days earlier; for cotton with normal bolls, the cotton boll is cracked for 5~7 days. Good harvesting. Premature harvesting is poor in color and low in quality; too late in harvesting, the fiber strength is reduced and the length is shortened.
5. Hierarchical harvesting: When harvesting cotton, different varieties should be mined and harvested. For example, cotton and cotton should be mined and harvested. Before the frost, cotton should be mined and harvested after the frost, and cotton and frosted cotton should be mined. Harvest, normal mature cotton and peeled green peach cotton should be mined and harvested, and graded. Also note that cotton that is not fully mature should not be rushed to harvest; cotton with dew on cotton wool is temporarily unavailable.
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