Recently, when I went to the cotton area to investigate the current cotton growth situation, I found that many cottons have appeared prosperous: cotton seedlings have 7 to 8 true leaves, sparse stems are sparse, and the main stem epidermis is more than 70% green , red is not Up to 30% , the upper leaves are larger, appear top-heavy, and begin to tilt after the rain. When the author communicated with the farmers, it was found that some of the base fertilizer was applied excessively, and the compound fertilizer with a nitrogen, phosphorus and potassium content of 45% per mu was 100 to 150 kg, and some applied nitrogen fertilizer, only ammonium bicarbonate and a small amount of phosphate fertilizer. Without the application of potassium fertilizer, such fertilizer application and fertilization structure will inevitably lead to the vegetative growth of cotton in the early stage. It is easy to be too prosperous or even mad. If it is not adjusted in time, it will inevitably cause shadowing of cotton fields, aggravate the detachment of buds, and cause blindness, etc. Pest damage, and finally attenuate production and reduce income.
In view of the phenomenon that cotton grows too prosperous and mad, the author suggests that farmers must use the method of fertilization and regulation to adjust and control the cotton according to the planned production target and shape the ideal high-yield plant shape.
   What is the ideal cotton planting pattern? From the transgenic hybrid cotton, the plant height is about 130 cm, the fruit branches are about 20 layers, the internode distance is 5 to 6 cm, and the individual plants are 50 to 55 peaches. About 70,000 or so, about 750 kg per mu of seed cotton , such a high-yield structure is more in line with the actual production of large-area hybrid cotton in China. In order to shape the high-yield plant shape, the following technical aspects must be grasped.
   First, choose a plant growth regulator.
   There are many varieties of growth regulators on the market today, and it is easy to make mistakes if they are not well grasped. For prosperous cotton, the author advocates the use of authentic delayed plant growth regulators, ketamine or melatonin. The effective component of the ketamine is 98% , and the active ingredient of auxin is 25% , that is, 1 gram of ketamine is equivalent to 4 ml of auxin. For ease of handling, the ketamine is recommended to use a 1 gram package.
   Secondly, it is necessary to regulate cotton plants because of the seedling system.
In recent years, in the regulation of cotton plant shape, there are often three kinds of mistakes. One is that the application dose is too large, which inhibits the growth of cotton. The second is that the application amount is too light and can not play the role of regulation. Third, the application is not timely, and the application is not timely. The role of regulation. Years of production practice experience, the principle of application should be "a small number of times, before the light and then heavy", generally starting from the Shenglei period, to the end after the topping. In the early stage, 1 gram of ketamine or 4 ml of auxin can be administered per acre . The highest dose is generally applied after topping, especially long cotton, 5 grams of ketamine or 20 milliliters of auxin can be used per acre to cap the top and prevent "secondary growth".
Third, we must master quantitative indicators to control seedlings.
First, the functional leaves of the bud period (the fourth round from the top to the bottom ) are more than 15 cm wide ;
Second, the inter-node distance is more than 6 cm;
Third, the application of the green stem portion of the main stem can be started when it exceeds 50% ;
Fourth, we must apply fertilizers scientifically.
   The experience of high-yield cotton application for many years is “the speed of seedlings, the stability of buds and fertilizers, the flowering of the bells and the fat, the general application of peachesâ€. At present, it is necessary to increase the application of phosphorus and potassium fertilizer to the cotton fields with partial nitrogen fertilizer, especially the bud stage fertilizer should not be less than 30 kg per mu , and advocate the application of bio-organic compound fertilizer as much as possible. For the cotton field that is over-fertilized, it is necessary to control the amount of fertilizer applied. After the cotton is concentrated on the peach, it is necessary to generally apply the peach fertilizer to enhance the stamina.
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Disperse Red
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