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Caused by the emergence or outbreak of cotton stem blight disease, the first is the potential lack of potassium or no potassium fertilizer; Second, extensive farming cotton, cotton root development is poor; Third, the cotton ground water level is high or the drainage system is not smooth; Fourth, In the cotton field, too much nitrogen fertilizer is applied, and the growth of the cotton is excessively prosperous and shaded seriously. Fifth, no organic fertilizer is applied in the cotton field, and the soil pellet structure is poor and the fertilizer supply is weak. It can be seen that the predisposing factors of the disease are mainly severe potassium deficiency in soil, followed by poor cultivation environment. For this reason, after the rain, we must pay close attention to comprehensive measures and early prevention and treatment.
First, it is necessary to supplement the application of potash fertilizer to increase the potash effect. First, for cotton fields with potential potassium deficiency or no potassium fertilizer, combined with application of boll fertilizer to apply potassium fertilizer, apply 10-15 kg of potassium per mu, and if the varieties of insect-resistant cotton are used, the amount of fertilizer per mu should be increased by 5 kg. The second is to increase the use of potash fertilizer for a small amount of potash fertilizer, the amount of no less than 10 kg per mu. One can meet the needs of cotton for potassium fertilizer; Second, it can improve the structure of fertilizer in cotton fields and increase the utilization rate of nitrogen fertilizer and phosphate fertilizer.
Second, under the control of the promotion of strengthening the resilience of cotton. To improve the environment of cotton fields, it is possible to enhance the resilience of cotton. The first is to use a plant growth retardant, diluteamine or booster, to control the growth of cotton. - 12 ml, sprayed with 50 kg of fresh water, can effectively promote its stability, reduce the shade; Second, the cotton field of the soil compaction, timely cultivator break ventilation, enhance permeability performance; Third, low-lying cotton fields, to Careful attention should be paid to digging the trenches to promote the lowering of the cotton roots. Fourthly, for the cotton fields cultivated with double membranes, the mulch film should be removed immediately and the cotton roots should be developed in depth.
Third, spraying outside the roots can improve the oxygen supply and fat absorption environment. For cotton with red leaf stem disease, as long as the cotton leaves have not wilted, the main stem growth point is still viable, and fertigation can be used to quickly restore fertility. First, 100 ml of humic acid active liquid fertilizer Huimanfeng per acre, 50 kg of water spray, both fast fertilizer, but also can improve the status of soil oxygen supply; Second, 100 grams of fertilizer for each mu of 50 kg of water spray, It can supplement a large number of elements and trace elements; the third is to spray plant growth promoter "802", which can accelerate cell division and enhance cotton self-regulation.
Heavy Rainfall Prevents Cotton Leaf Stalk Blight
In the recent past, the cotton area has been gradually reduced to heavy rain. According to many years of experience, some cotton fields in cotton fields are prone to leaf blight. The symptoms of the disease are: from the point of growth of the main stem or the top of the fruit branch, the disease usually begins from the top to the bottom, and the tip of the leaf and the leaf margin are green and the veins are green. The veins between the veins are pale yellow. Gradually turned into red, the leaf roll and then withered, petiole loss of water, the leaves gradually fall off. The main stem wilted to death but there was no abnormality in the anatomic catheter, the roots were thick and short, and the fibrous roots were few and stunted.