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According to the survey results of Guoxin Cotton, the growth period of the main stem was from June 10 to July 10, with an average daily growth of 1.5 cm. At this time, it was also the most prosperous period of root growth. If you grow too fast, it will affect the growth of the roots and cause unbalanced growth in the ground and underground. It is also not conducive to the control of plant height. Therefore, most cotton fields should be sprayed for the first time in mid-June.
Specific day when the start of control, mainly depends on the growth of cotton seedlings. For cotton fields with fast development, large leaves, and high plant heights, it is appropriate to start in early June. The large blade of cotton seedlings indicates that the vegetative growth is prosperous, and it needs to be controlled. The chemical control effect is mainly controlled by the amount of drugs. Generally, the cotton field is used for shrinking 0.3 to 0.5 grams, the growing cotton field will increase the amount, we must eliminate the concerns of budding period control, once the control is late, it will result in passive management. Specifically, we must grasp the following points:
First, the selection of an effective composition that complies with national standards is more than 97%, and impurities are less than 1.5%. Use other chemical control drugs that do not specify the impurity content and unknown ingredients. In the past, the problems that occurred in chemical control of cotton farmers were either ineffective or too heavy, which were caused by the use of unqualified agents or regulators of unknown ingredients.
Second, the spray must make the cotton tip medicine because of shrinkage Ann sprayed on the cotton plant to absorb fast and transfer very slowly, the new leaves, fruit branches and stems of the cotton plant will be contained in the cotton tip, such as the cotton tip is not the drug However, it will not be able to achieve the goal of smaller 3 blades in the future and shortening of the next 3 internodes. Therefore, when the spray encounters a large blade and covers the tip of the cotton, it is necessary to spray the liquid onto the tip of the cotton from the side.
Third, due to seedlings should be controlled by the same plot in the same plot to control large seedlings spray, seedlings less spray or not spray.
Fourth, the test effect If 3 days after spraying, the new leaves did not change, indicating that the drug is small, and can be sprayed again as appropriate; if the new leaves are dark and shiny, clear folds, indicating that it works .
Fifth, fertility to increase the amount of fertile vegetables and garlic raw land, the amount of drugs does not work less, spray a lot more suitable? Can be tested first. Do not be confined to ideology, especially fertile land, 1 to 2 grams of mu medication do not work. As long as the dose is increased, there is no control over the cotton fields.
Sixth, the main control of the mu dose of mu medication 0.3 to 0.5 grams, 10 to 15 kg of water per mu in the bud stage is sufficient.
Seven, seedlings are not neat to be single-control single spray shrinkage can prevent large seedlings and seedlings with the same amount of drugs, if you add pesticide mixed spray, must be based on chemical control, meet multiple insects can not spray more, so as not to affect the cotton Plant growth.
VIII. After the start of chemical control, the curative effect of Chuanjie'an can not be interrupted for 10 to 15 days. If the control is not continued after the initial chemical control, it will cause the growth of the cotton plant to rebound, and may even result in the elimination of chemical control. Therefore, after the start of chemical control, it is controlled once every 8 to 10 days, and the dose gradually increases. The interval date and dose may depend on the growth condition of cotton plants and weather conditions.
Nine, control the amount of drugs in the morning and evening began to use less drugs, began to use more appropriate medication.
X. Density of different doses Different density requirements require that the plants be controlled short, and the chemical control should be appropriate earlier, the larger the dose; the small density of the plant height is not strict, and control can be appropriately relaxed.
Eleven, do not forget to pay attention to fertilizer fertilizer after the control of darker leaves, but it does not mean no shortage of fertilizer. The top dressing must be top dressing. In the evenly growing, low-lying plots, it is also possible to add 1% urea when controlling, which not only controls the seedlings but also supplements the nutrients; but do not add fertilizer in cotton fields where the cotton seedlings are not neat, otherwise the big seedlings will be bigger. .
Twelve, combined with the best forecast of weather forecast Before the rain, after the rainfall and other control can easily lead to passive.
XIII. Reinstatement can be remedied. According to the method described above, there is generally no problem of excessive control. There are often four cases of excessive chemical control: one is that the drug amount is calculated wrongly or that the spray is not well controlled; the second is that there is rain, and no rain occurs after spraying; the third is the use of unknown ingredients such as nutrients containing regulators. And mixed-squeezed spray; four is not effective after the control, then increase the amount of spray. If the chemical control is heavy, the 1% urea solution can be used to relieve the problem; if the urea is ineffective, it can spray “920â€.
Although this year's cotton was sown late and the development of cotton seedlings was late, its growth has accelerated recently. In early June, the good growing cotton fields in the north already have 7-8 real leaves, and some are budding. Most of the cotton fields will enter the budding period one after another on June 10th. Most of the cotton fields on June 10 of last year are now 3 This fruit branch will have two fewer fruit branches this year. There is no top peach or a few top peach. This is not necessarily a bad thing. It can save the work of early buds and the removal of 1 or 2 fruit branches, which will help reduce the number of bad bells and Stiff bell bell.