In the cotton production process, diseases occur almost every year, affecting the cotton production to varying degrees. In particular, fusarium wilt, stem blight, leaf blight, and red leaf blight have a greater impact, and wilt is caused by pathogens. Disease, the latter is a physiological disease.
Cotton wilt disease and wilting and yellow wilt mixed wards mostly occur in the old cotton areas where cotton is planted for many years. They are generally spread by the diseased seeds. In the conventional control measures, many disease-resistant varieties are replaced. The implementation of the paddy-wheels as the main, these two measures have a certain control effect on the wilt disease, but some old cotton areas do not have abundant water sources, can only grow dry land crops. Some disease-resistant varieties, although with good resistance to wilt disease, but the high yield can not be synchronized, therefore, disease prevention must provide another way.
Blight of cotton usually occurs every year. Stem blight and red stem blight occur from year to year. Last year, the incidence of stem blight was large, and the loss suffered was uncommon for many years. The farmers did not know the cause of the disease, but complained that the weather was not good. In fact, these kinds of diseases have proved to be related to the lack of potassium fertilizer in the cotton fields according to our many years of extensive surveys.
In recent years, through the practice of cotton production, scientific application of bio-organic compound fertilizer and potash fertilizer can prevent cotton withering and blight, stem blight, and stem blight of red leaves.
Bio-organic compound fertilizer can inhibit cotton wilt. Because of the organic matter in the bio-organic compound fertilizer and the various types of microbial fertilizer applied, the secreted organic acids can improve the soil environment and can significantly inhibit the survival of Fusarium oxysporum. Applying 100-150 kg of bio-organic compound fertilizer per acre in the application of basal fertilizer or chase-herb fertilizer in cotton can better prevent the occurrence of blight, or greatly reduce the degree of disease, and quickly restore normal reproductive function.
Potash can increase cotton's defense against wilt disease. First, increasing potash fertilizer can coordinate the proportion of nitrogen, phosphorus, and potassium fertilizers in the soil and increase the cotton's own activity. Second, the lack of potassium in cotton will reduce the supply of carbohydrates, and protein synthesis will be hindered; third, the area of ​​transgenic insect-resistant cotton. Large, they have slow absorption and conversion of potassium, no potassium fertilizer and a small amount of potassium is not effective. Increased potash fertilizers increase the activity of cotton and also increase the ability to prevent fusarium wilt and blight, stem blight, and stem blight. Therefore, the application of about 60 pounds of potassium sulfate or potassium chloride per acre can effectively increase the resistance to several of the above cotton diseases.
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