How to fertilize cotton at flowering and boll stage
At present, it is the cotton boll period, many cotton farmers ask this period how to fertilize the problem. According to Tianjin City Ninghe County agricultural technology extension center senior agronomist Qiu Jiashan introduced, flower boll period is cotton production fertilizer demand peak period, should be heavy nitrogen fertilizer mainly. The specific method is to apply urea 7.5 to 10 kg per mu of cotton field, which is required to be applied to the bottom of the ditch in the middle of the cotton row and buried. After topdressing, irrigation should also be carried out immediately, because the water consumption of cotton field in flowering and boll period is large, and the relative water content of 0 to 20 cm soil layer should be maintained at about 70%. Therefore, the irrigation amount per mu of cotton field should be about 45 cubic meters, and the general year flower bolls need to be irrigated twice. In addition, whether the second nitrogen fertilizer should be applied at boll setting stage depends on the condition of cotton plants.
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Prevention and control of cotton boll rot
First, poor light, suitable for bacterial infection, diseases are often serious, cotton boll rot is also more serious. According to the type of cotton boll disease, cotton boll rot is caused by many kinds of bacteria. In the rainy years of summer and autumn in the cotton area of our province, the humidity of the cotton field is higher, the closure is heavier, and ventilation accounts for 28.3% of boll disease. Our province rains in late August.
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Foliar topdressing of cotton is necessary in the later stage.
This weather phenomenon of drought before and rain after transplanting is very disadvantageous to the survival and growth of cotton after transplanting, and the growth process is about 10 days later than usual. In order to improve the rate of flower bud formation and boll formation in the later stage of cotton, it is suggested that the majority of cotton farmers should strengthen the management of fertilizer application in the later stage by foliar spraying.
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