At present, cotton has gradually entered the bud stage, which is a critical period for the production. The focus of this period of management is to promote the development of the root system, maintain the steady growth of the plant, and achieve the strong cotton plant growth. In order to meet this requirement, chemical control is one of the important measures. The author reminded the majority of cotton growers that this year's cotton has high temperatures after the emergence of cotton, cotton seedlings are growing vigorously, and there are more rainy days in the near future. Some cotton fields have a prolonged trend. They hope that the cotton farmers will step up control of the cotton fields and ensure the stable growth of cotton, which will be a good harvest for cotton. Lay the foundation.
The cotton buds of the budding period of the chemical-controlled cotton fields should be cultivated into strong seedlings. The growth pattern is compact, with thick stems and large buds. Zhao Junxing pointed out that the daily growth rate of the main stem of strong seedlings is about 1 cm at the beginning of budding, 1.5 to 2 cm at budding stage, and 40 to 50 cm at the early flowering stage. The ratio of red stems is about 60%, and the leaf color is greenish and low at the beginning. The buds are large in size, lacking depth, and a fruit branch grows in about 3 days. If the cotton grows too fast, the leaves are hypertrophied, the leaves are greenish, the stems are thick and long, the branches are thin, the included angle is small, the daily growth exceeds 3 cm, and the ratio of red stems is less than 60%. This is a long-term performance and should be promoted. Control to regulate cotton growth.
Cotton budding control methods Cotton needs to adhere to the principles of early, light and hard work. According to growth and seedling conditions, it is timely controlled by the use of dildoamine or methotrexate. Zhao Junxing reminded that attention should be paid to mastering the principle of “spraying high (high trees) not spraying low (dwarf trees) and spraying strong and not spraying weakly. It should be based on the land, due to seedlings, adaptable to the climate, and flexible use, control and promotion, and promotion of strong Steady growth.
As early as possible, early chemical control lays the foundation for a good chemical control effect in the future. Generally, the first chemical control can be started in the initial stage of budding of 8 to 10 leaves of cotton. Note that the initial dosage should not be too large, so it is better not to have obvious inhibitory effect, and to lay a good foundation for determining the amount of the next dose.
Light: In order to avoid over-suppression of cotton by excessive single-use, it is necessary to master the method of “eat less and more mealsâ€. The first to third use of compound preparations is better. For the cotton field with prosperous growing cotton, it can spray 1 to 2 milliliters of auxiliaries per acre in the early stage of budding, and then sprays and boosts the strength of the muscles per mu after budding period. 2 to 3 milliliters of chemical control can be carried out as early as possible, and the volume of water per acre of medicament is 10 to 15 kilograms and the cotton plants are sprayed.
Diligence: In order to achieve the desired effect of chemical control, naturally, there will be a "difficult" word, insisting on a small number of times. Chemical control generally does not have to be used alone. It can be used in combination with cotton to control aphids, cockroaches, cotton aphids, cotton bollworms, and disease prevention.
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