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For the cotton in the flowering period, because the vegetative growth is still in parallel with the reproductive growth, the partial application of nitrogen fertilizer will cause the cotton to grow longer and then grow longer, which not only aggravates the detachment of the bud, but also causes premature aging. After the madness, the cotton field is too large, the humidity is high, and the air is not ventilated and light-transparent. The cotton buds in the lower part are extremely susceptible to mildew, which eventually leads to a reduction in cotton production. Therefore, part of the cotton entering the flowering period should be based on the application of compound fertilizer, 15 to 20 kg of compound fertilizer should be applied per mu, or a small amount of urea should be applied, and phosphorus and potassium fertilizers should be applied, especially the varieties of insect-resistant cotton. Farmers should increase the application of potash fertilizer, not less than 15 kg per mu of potash, and the fertilizer should be applied in depth during the flowering period.
For the cotton that has been ring-bellied, it is necessary to apply peach fertilizer. If the area with large area of ​​hybrid insect-resistant cotton is planted, the peach fertilizer should be applied twice. When the average cotton per plant has 2 to 3 peaches, it should be applied per acre. Urea is about 15 kg. When there are about 10 peaches per plant on average, about 15 kg of urea should be applied again. There is no need to worry about the use of urea when cotton has more peaches. Because the cotton has been transferred to the cotton bolls after the peach is sitting on the peach, the nutrients are transferred to the cotton bolls, and sufficient nutrients are supplied in time to increase the weight of the bolls, the weight of the seeds, and improve the quality. However, the application period of peach fertilizer can not be too late, and too late application will only lead to late maturity.
In the flowering and boll stage, cotton is fertilized by seedlings.
Flowering and bolling period is a key period for cotton to gradually change from vegetative growth to reproductive growth. It is also the peak period of cotton ringing. The cotton concentration period is from late July to early August. The time period is the golden period of cotton ringing, and it is also the period when cotton needs most fertilizer, but specific to different cotton fields, it must be different from seedlings.
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