August cotton field management, these recommendations are worthy of attention!

At present, cotton is about a month away from mature bolling and spraying defoliating agents. South Xinjiang delays spraying for 10-15 days relative to northern Xinjiang, and the longest time from now to spraying defoliants is 40-45 days. That is to say, from the defoliation agent, the northern slashing agent on September 5th is just one month ago. In the previous proverb, it was said that the flower was spent 48 days, but in the middle and late period, the maturity period generally reached 50-60 due to the temperature drop. day. The growth of cotton peach is as follows: The suitable temperature for the development of cotton peach is 25-30 degrees, which mainly includes the volume increase period of three periods (mainly fiber growth process), the filling period of cotton peach (fiber thickening and cottonseed development process) and dehydration ripening. period. In the early stage of cotton peach development, the volume is mainly increased, and the middle stage is mainly for enrichment. Finally, after 5-7 days of dehydration, mature bolls are experienced.

From now on, it takes at least 40 days for cotton to grow into a cotton peach. That is to say, the flowers that are now opened later may reduce the weight of the single bell when spraying in the later stage, except for the cotton picking agent in southern Xinjiang. Therefore, during this period of time, it is especially important to promote the rapid growth of cotton peaches, so that the long growth period of the cotton and the fiber thickening period.

At this stage, cotton is in a critical period of expansion and maturity of cotton, fiber formation, quality improvement, increase in boll weight and high yield. Careful field management will directly affect the quality and yield of cotton. To speed up the filling of the peaches, you need to do the following:

1. Root and leaf protection, balanced fertilization, prevention of premature aging in cotton fields

At present, due to the size of the lines have been closed, the field transpiration is much weaker than in July, the drip interval should be adjusted to about 10-12 days, normal cotton fields from this water to reduce the use of nitrogen fertilizer, increase the use of phosphate fertilizer, potassium fertilizer, The use of high-content phosphorus and potassium fertilizer is 3-5 kg, and the application of urea is 5-6 kg. For the weak seedlings, it is mainly promoted. The unsealed cotton field is not more than 8 days, and the urea is 6-8 kg. Potassium dihydrogen 3-4 kg; for the yellowing of cotton leaves, the fertilizer can be sprayed on the foliar surface according to the specific conditions. For example, because the water is large, the roots are soaked and the leaves are yellow. The leaf surface can be sprayed with 50 g of zinc fertilizer + 1.4% sodium nitrophenolate 7-8 g. For the yellowing of weak seedling leaves, 100 g of dihydrogen potassium + 80-150 g of urea foliar spray can be used to keep the leaf function from decreasing.

2, cotton axillary buds, group tips, weed cleaning

There is nothing deep in the management of cotton fields. If you want to produce high yields, you must do it in a down-to-earth manner. The poor ventilation and light transmission in cotton fields will definitely affect the ability of leaf photosynthesis to produce nutrients. In addition, the growth of the clusters will also consume cotton nutrients, prolong the maturity of autumn peaches, and reduce the unfavorable conditions such as single boll weight. By hitting the group tips and cotton pruning and axillary buds, the cotton nutrient concentration is ensured, the cotton field is kept ventilated and light-transmitted, and the buds are reduced to prevent the cotton from growing. Cotton field fights, axillary buds and weed cleaning are the most effective field management measures to prevent cotton fields and promote peach ripening.

3, pest control can not relax

Generally, there is a wave of red spiders and autumn crickets that harm cotton fields in the middle and late August. Because of the prosperous cotton fields this year, the plants are tender and tender, which is conducive to the breeding of autumn sorghum. For the cotton bollworm in the end of July to early August, the second generation of cotton bollworms lay a large number of eggs, and the upper and middle of August will be the period when the three generations of cotton bollworms begin to be harmed, and comprehensive control can be carried out for these insect pests. The method is as follows: acetamiprid or imidacloprid + alkyne or triazole tin.

Cotton management is nearing completion. At the last juncture, grasping the details of cottonfield management will play a decisive role in this year's production. Water and fertilizer, pest control, premature deficiencies, and peach precocity, to reduce the production of defoliants. The cotton peach is not fully mature. It is considered to be the time to flower to the boll opening. Promoting the early ripening of the cotton peach will be among the top of the field in August.

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