This year, the cotton area has been reduced, but in some advantageous production areas, cotton is still the main choice for farmers. Fertilization level, chemical regulation and field management are the main factors affecting cotton yield and quality. In summer, rainwater increases, cotton field dredging and water and fertilizer coupling are also urgent tasks. Today, this edition invites agricultural technicians to answer questions for readers.
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Timely control and prevention of premature aging
According to recent surveys on some cotton-producing areas, the weather during the sowing and seedling cultivation of cotton this year is good. Most farmers planted in mid-April and transplanted in mid-May. After transplanting cotton in many cotton fields, the weather was fine and the temperature was very different. The cotton seedlings showed short-term diapause. From the end of late May to the beginning of June, the temperature rose faster and the cotton seedlings accelerated. There are 6 to 7 true leaves in the field cotton seedlings. Among them, we have seen some cotton covered with plastic film mulching in Chenxie Village of Miaotou Town of Hanchuan City and Zhonglu Village of Gumeng Town of Yunmeng County. It has been widely budded, and the most has 3 layers of fruit branches. The growth of cotton seedlings is obviously prosperous, the width of functional leaves has exceeded 15 cm, and the ratio of red and green (color) of stems is imbalanced. However, some cotton seedlings, due to poor drainage of cotton fields, high groundwater levels, poor root development, and some blight have been invaded, the serious incidence rate is as high as 30% or more, and some farmers have already supplemented the seedlings 2 to 3 times. For different types of seedlings, if no measures are taken for chemical regulation, cotton production will be greatly lost.
First, we must grasp the heat of chemical regulation. It has been a long time since the use of chemical regulation to manage the growth and development of cotton. However, in the practice of production, farmers have made mistakes every year. Some farmers have seen that cotton has grown, but they have been afraid to take measures to control their stability and fear. After the control, the cotton is not long, and as a result, the vegetative growth is too strong, and the nutrient is consumed too much, leading to premature aging of the cotton in the early stage. Although some farmers have also carried out regulation in the early stage, they have over-regulated cotton growth, inhibited normal growth schedule, shortened fruit branches, concentrated leaves, and obstacles in flower bud differentiation. Although some have been regulated, the amount of drug used is small and it has not played a role in controlling the situation. To this end, it is necessary to remind farmers to pay attention to the general growth of cotton in the field, to prevent the long-term regulation time to grasp in the Shenglei period is appropriate.
The second reason is to determine the dosage for the seedlings. The soil is fertile and the level of fertilization is high. The cotton that grows faster should be controlled early. After the cotton enters the bud stage, it depends on the diagnosis of the seedlings. The daily growth of the main stem exceeds 2.5 cm, the functional leaves (the fourth leaf of the main stem growth point) are more than 15 cm wide, and the red part of the main stem is less than 30%. The cotton seedlings that are recessed are the objects that control the prosperous. There are many varieties of plant growth regulators selected, but it is safer and more reliable with delayed type of ketamine and auxin (both formazan). The principle of application is “a small number of times, before being light and heavyâ€. At present, it has entered the prosperous period of cotton in the prosperous period, shrinking 1 gram per acre or 4 ml of auxin, spraying 15 to 20 kilograms of water, and gradually increasing the dose later. For cotton seedlings with weak growth and slow development, plant growth promoters should also be used to accelerate growth. The available medicinal agents are 3,000 times of “802â€, that is, 20 ml per mu and 35 to 50 kg of water. The second is a 0.01% sputum (brassinin lactone) solution, 10 ml per acre with 15 to 20 kg of water spray.
Third, we must promptly rescue the diseased cotton seedlings. For cotton fields with blight, except for the use of 9.5% gram of sodium sulphate 300 times or 0S-Sterling 500 times solution to control the spread, a better measure is to add 50 kg of bio-organic fertilizer per acre, with potassium fertilizer. 15~20 kg can play a more significant role in restoring normal cotton growth and improving defense ability.
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