Optimize fertilizer and water supplies to alleviate cotton wilt
Cotton wilt is called cotton "cancer." To control cotton wilt disease, in addition to selecting disease-resistant varieties, improving water facilities and improving fertilization techniques can relieve symptoms and enhance plant disease resistance. Addition of Organic Fertilizers The author applied bioorganic compound fertilizers to cotton fields with a rate of 20% of the occurrence of cotton wilt disease. The rate of diseased plants in the year fell below 5%, which is higher than that of the adjacent cotton field where no bioorganic compound fertilizer was applied. The rate is reduced by 15 percentage points. This is mainly because the secretion of bio-organic fertilizer can inhibit the proliferation and infection of pathogens. Generally, 3000-4000 kg of organic fertilizer is applied per mu, or 75 kg of bio-organic compound fertilizer, or 100 kg of high-energy organic compound fertilizer. All localities can be flexibly selected according to the actual situation in the area. The application of potash fertilizer currently accounts for more than 80% of the market for insect-resistant cotton varieties, while the demand of potash-resistant cotton varieties is more than 1 times higher than conventional cotton. The potassium deficiency phenomenon of planting insect-resistant cotton varieties in Datian is more common, and increasing potash fertilizer can not only increase the resistance of the plants to fusarium wilt, but also prevent the physiological diseases (blight) caused by potassium deficiency and the continuous high temperature and frequent rainstorms. Outbreak of red leaf blight. The amount of potash fertilizer per acre for general insect-resistant cotton fields should not be less than 30 kg. Heavy-duty Shishuhuahualing fertilizer cotton boll period is the peak period of fertilizer demand, each mu need to apply high content of multiple compound fertilizer 20 kg. When there are 3 or so bells per plant, 15 kg of urea need to be applied per acre. At the same time, potassium dihydrogen phosphate, Sonic boron, etc. are sprayed outside the roots to prevent premature aging of cotton. Improved water facilities In the cotton fields that are susceptible to wilt disease, the incidence of high groundwater levels is higher than that of groundwater levels. This shows that poorly rooted cotton plants have weak resistance to fusarium wilt. Water plants have good cotton fields and cotton plants have good rooting and can increase the resistance to wilt disease. They should be able to communicate with each other in large furrows, furrows, and gutters, and the rain should be kept dry.