Cotton mid and late management technology

The drought lasting for six years has made the rice production in our city face a severe test. In the case that the irrigation water source cannot be guaranteed, this year's rice production in our city should focus on the goal of high quality and high efficiency, focusing on the promotion of high-quality rice varieties and water-saving cultivation techniques. At present, the growth of cotton is at its budding stage and is about to enter the flowering stage. It is at the stage of reproductive and vegetative growth. It is important to coordinate the relationship between the two, and it is important to promote the stability of cotton, reduce the shedding of bolls, and improve the quality and yield of cotton. significance. If improperly managed, it can easily lead to excess nutrient growth, resulting in leggy cotton plants, and a large number of budding bells falling off and reducing production. Especially in rainy years, more attention should be paid to it. This year, the growth of cotton is relatively arid, and the number of days of oligos is relatively high. Growth and development are affected to a certain extent. Therefore, it is very important to strengthen the management of cotton in the middle and later stages to seize the increase in cotton production. The main management techniques: 1. Flowering and bolling flowering and bolling period is cotton sensitive fertilizer period. For cotton fields without bottom fertilizing material or insufficient base fertilizer, we should see the flowers reapplying flower bell fertilizer, which can be combined with watering or before rain (no water pouring conditions ) Utilize 10 kg of urea per mu, 10 kg of diammonium phosphate and 15 kg of potassium sulfate. Make up nutrients to prevent premature aging. 2. The systematic control of chemical regulation according to the amount of rainfall and the appropriate amount of time for the growth of cotton. For cotton that has not been chemically controlled during budding period, it can be sprayed at an appropriate interval of 1.5 to 2 g/mu in the early flowering period in early July, and spraying 2.5 to 3 g/mu in the flowering period as appropriate. Reduced section safety 3.0 ~ 4 grams / mu, in order to promote the stability of cotton, reduce the bell drop. 3. Pruning (1) Timely topping. The time is usually from July 10 to 20. High-yielding cotton fields can be postponed to a suitable time, starting on July 15 and ending on the 20th. Middle and low-yield and high-density cotton fields should be properly towed early. The mastery time begins on July 10 and ends on the 15th. (2) hit the top. The time usually ends before August 10. According to the growth of cotton, it is important to grasp the tip of the fruit branch below the main stem before topping, and hit the center and the tip of the upper fruit branch several times after topping, adjust the timing of the belling and the location of the bell, promote the premature and high quality of the cotton. And high yield. 4. Foliar fertilization practice has proved that it is very important for the cotton field without water pouring conditions to increase the yield and quality through foliar fertilization. Specific control: From the beginning of the flower and boll stage, the use of potassium dihydrogen phosphate 150 ~ 200 grams, will receive more than 10ml, borax 100 grams, 100 grams of zinc sulfate, urea 500 grams, 50 liters of water, mix thoroughly, every 10 Sprayed once a day ~ 15 days, spraying a total of 2 to 3 times. Can be combined and controlled simultaneously. 5. Pest control (1) Fusarium wilt of cotton: 40% carbendazim or 65% mancozeb WP can be used for foliar spray control. (2) Verticillium wilt of cotton: In the early stage of disease, 40% carbendazim can be used to irrigate the roots (0.5 kg/plant) at 1000 times, or 500 times of fulvic acid and 500 times of anti-dead-mite mixed spray. When the number of diseased plants is low, remove the burned ones in time. (3) Cotton aphid: Controlling when the leaf rolling rate reaches 5% to 10%. The foliar spray was carried out using 4.5% high efficiency hydropermethrin 1000 to 2000 times solution, or 10% imidacloprid wettable powder 2000 to 3000 times solution. (4) Helicoverpa armigera: Second-generation bollworms should be controlled as appropriate. Fifteen young larvae of 100 bollworms of three generations and eight to ten young larvae of bollworms of four generations should be controlled. The use of 35% endosulfan EC 1000 ~ 1500 times solution, or 2.5% deltamethrin EC 1000 times spray control. If the density of wormholes is not large, it can be combined with artificial defoliation. (5) Pay attention to the elimination of other insect pests such as cotton aphid and cotton aphid. 6. Rainy season drainage If there is more rain in the later period, the water in the cotton fields, especially the dryland in rice reform, should pay attention to timely drainage.

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