Insect-resistant cotton effectively controlled the hazard of cotton bollworm, the number of bud-bells dropped greatly, the reproductive growth was strong, the bells were early and many, and the peak of fertilizer needed to be fast and fierce. If the traditional fertilization method is used, it is often unable to meet its needs, resulting in premature aging due to poor nutritional growth. In addition, the insect-resistant cotton has introduced an insect-resistant gene, and its disease resistance is reduced, and it is prone to diseases such as stem blight of red leaves, and potassium fertilizer has the function of enhancing cotton stress resistance and disease prevention effect.
If blindly increase the application of nitrogen and phosphate fertilizers, neglecting the application of organic fertilizers and potash fertilizers, it will not only increase the cost of fertilization, but also often lead to cotton not premature aging or late maturity, which has a great impact on yield and quality. Therefore, it is necessary to increase the application of organic fertilizer, potassium fertilizer, and reduce nitrogen and phosphorus fertilizers, applying about 3,000 kilograms of organic fertilizer per acre and 10 to 15 kilograms of potassium fertilizer. From the traditional application of urea 25 to 30 kg per mu, 50 kg of superphosphate, reduced to 12 kg per mu, 25 kg of superphosphate. Apply the above fertilizer to the ground and apply it 15 cm or less.
The application of the flowering bell fertilizer once concentrated is applied twice: the flowering and bolling period is the period in which the growth and development of cotton is the most vigorous and the most fertilizer is needed. Generally, 25 to 30 kg of urea and 10 kg of potassium fertilizer should be applied per mu. In view of the fast and concentrated characteristics of the flowering and ringing of the insect-resistant cotton, 2/3 of the flowering bell fertilizer can be applied to the initial flowering stage, and the remaining 1/3 is applied after about 15 days, so as to satisfy the continuous flowering and ringing of the cotton. Need, but also effectively avoid the long and premature aging of cotton plants.
The topdressing soil is applied as a foliar application: in the late stage of cotton growth, the absorption capacity of the root system is reduced. If the nutrient is insufficient, it is easy to cause premature aging, and it is necessary to apply top fertilizer. The foliar application of the topping fertilizer has the advantages of simplicity, quick effect, good effect, and fertilizer saving, and can save 2/3 of the fertilizer compared with the soil.
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