In recent years, a large number of insect-resistant cottons introduced in various regions have effectively controlled the damage of bollworm, the number of shedding of bells has been greatly reduced, her reproductive growth has been vigorous, her bells have been early and many, and her peak fertility has become faster and fiercer. Fertilization according to traditional methods often fails to meet its needs, resulting in poor vegetative growth and premature aging. In addition, insect-resistant cotton has been introduced into insect-resistant genes, its disease-resistance has declined, and diseases such as red leaves and stem blight have been apt to occur.
Increasing potassium fertilizer and reducing N and P fertilizers
Potassium fertilizer has the function of strengthening the resistance of cotton and the disease-preventing effect. Therefore, the insect-resistant cotton needs to increase potassium fertilizer. If nitrogen and phosphorus fertilizers are applied blindly, neglecting the application of organic fertilizers and potash fertilizers will not only increase the cost of fertilizers, but also lead to premature or late maturity of cotton, which will have a great impact on the yield and quality.
The application of organic fertilizer and potash fertilizer to reduce nitrogen and phosphate fertilizers is as follows: about 3,000 kilograms of organic manure in Mushi and 10-15 kilograms of potash fertilizer. Urea 25-30 kg of urea and 50 kg of superphosphate are reduced from the traditional Mu, to 12 kg of urea and 25 kg of superphosphate. Combine the above fertilizer with deep soil preparation and less than 15 cm.
The Hua Bell Fertilizer was changed into two separate application
The flowering and bolling period is the period when the growth and development of cotton is the most vigorous and the fertilizer is the most needed. Generally need to apply 25-30 kilograms of urea, potassium fertilizer 10 kilograms. For the characteristics of fast and concentrated flowering and bolling of insect-resistant cotton, 2/3 of flower and bell-fertilizer can be applied in the early flowering period, and the remaining 1/3 can be applied again after 15 days or so. This can satisfy the constant flowering and ringing of cotton. Need, but also can effectively prevent the cotton plant's leggy and premature aging.
Cover top dressing soil changed to foliar topdressing
In the late growth stage of cotton, the absorption capacity of the root system is decreased. If the nutrient is insufficient, it is easy to cause premature senescence and it is necessary to apply top dressing. The foliar top dressing top dressing has the advantages of convenience, quick effect, good effect, and saving fertilizer, and can save 2/3 of the fertilizer than the soil dressing.
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