For a long time, many farmers have always had a misunderstanding in the management of cotton chemical control. When they discovered that the cotton was prosperous, spraying control of dilute amines was performed. Due to unsatisfactory results, the amount of medication had to be increased, and serious harm could be caused. Affecting the normal growth and development of cotton, Lei Ling falling off, reduce production, which is the result of passive control. Practice has proved that the active control of cotton in order to protect the bell to increase the high yield.
First, the main basis for active control refers to a small number of systematic and planned controls based on the weather and growth conditions of cotton plants. Pre-controlling cotton plants do not necessarily show longevity or uncoordinated fertility. The use of drugs in advance can prevent leggy and shape the ideal high-yield plant type, so as to achieve the purpose of protecting the bell and increasing the yield of the bell. The main reason is that the maximum effect period of the control of the dilcosamine on the stem branch is generally 10 to 15 days after the treatment, and generally can control between 2 to 4 newborns. Medication time determines the control site and the amount of medication determines the degree of control. It can be said that active control is to control the excessive growth of vegetative growth, promote the growth of cotton plants without swift growth, robust growth, and protect short bells.
II. Implementation In recent years, examples of high-yielding varieties such as "Xinxin Cotton No. 8" and "Xianmian 802" have been widely planted throughout the country, which fully proves that the general cotton field can be planned for four "active controls" during the whole growing period. . At the same time, we must master the six principles of “proactive, small, multiple, first, light, heavy, heavy, non-controlled, strong, controlled, non-controlled droughtâ€; and adhere to the "three look and one control", that is, look at the weather Change, see the soil fertilizer, see cotton growth and strictly control the total amount of drugs, generally not more than 10 grams / acre.
Third, the operation of technology For the first time in the bud period, cotton plants grow to 35 to 40 cm high, there are 4 to 5 fruit branches, red stem ratio of 60% to 70%, the time is about the middle and late June. Can use about 0.5 grams of musculine in the mu or 15 grams of compound control agent “cotton seat peach spiritâ€, and evenly spray 15 kilograms of water.
The second time in the early flowering period, after seeing the flowers in the cotton field, the plant height is 50-60 cm, the red stem ratio is 70%, and the cotton field has 6-8 fruit branches. The general year is about the first half of July, and the use of D-glycidol 1 ~ 2 grams or "cotton seat peach" 30 grams, 15 to 30 kilograms of water spray.
The third time in the boom period. That is, 85 to 90 cm in plant height, 90% of red stem, and 12 to 13 fruit branches, 2 to 3 grams of mu with dildodomamine, spraying 30 kilograms of water.
The fourth time after the top was 7 days. When the top fruit branch has 3 to 4 buds, the use of 3 to 4 grams of mu contractylamine, 30 to 45 kilograms of water, the main spray fruit top.
IV. Precautions General precipitation after spraying or watering, such as rainfall within 6 hours, should be based on rainfall from the length of time and the amount of rain spray according to the amount of spraying 1/3 to 1/2 spray. If careless use of drugs, should be promptly remedied, generally can be sprayed gibberellin, agricultural Hi-Qiu Su, six high-increasing production factors and other plant growth promoters, and timely watering. If drought occurs after the spraying of dilute amines, pay special attention to top-dressing watering. Do not use less green fertilizer due to the dark green color of the leaves. It is best to leave a control line that is not sprayed so that you can observe the lack of fertilizer in the soil. In addition, any product that is sensitive or insensitive to the reaction of diaminos should be used with caution or appropriately increased.
5. Remind that when passive control is performed, the entire plant should be drugged, and the appropriate amount of water should be added. The spraying speed should be slower. The spray rate should be narrower. It should be sprayed to every part of the plant, up and down, and around; Different, so that strains can be drug, water can be less appropriate, spraying speed can be faster, spray width can be more broad, sprayed to the top of each plant can be.
Whether it is active control or passive control, it must be adapted to local conditions. Even if it is the same piece of cotton, it must be due to film, ridges or even because of the tree. In general, the dense place should be heavy, and the weak place and light place should be lighter. In addition, the efficiency of chemical control operations is high, and the mastery of the drug and the technical requirements are relatively strict. When the active control is performed, it is generally better to work alone. When the passive control is performed, it can be combined with pest control and pest control.
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