Effect of Potassium Fertilizer on Cotton Growth

Cotton red leaf stem blight is a physiological disease, and the main cause of the disease is potassium deficiency. In addition, extensive cultivation of cotton fields and poor growth of roots; partial application of nitrogen fertilizer, cotton growth is too strong, the field is stagnation, affecting the absorption of potassium; early bells are early and many, leading to premature decay of cotton plants; long-term drought after sudden downpour , or long-term rain, these are the causes of cotton red leaf stem blight. Insect-resistant cotton has higher nutrient requirements for potassium than conventional cotton, and stem blight of red leaves is heavier.

It is understood that the application of potassium fertilizer has a promoting effect on the growth and development of cotton vegetative organs and reproductive organs, and has a greater effect on reproductive organs. The reason is that potassium application coordinates the supply of nutrients, promotes the growth and development of cotton roots, and expands. The absorption area of ​​the plant coordinates the relationship between vegetative growth and reproductive growth of cotton. At the same time, potassium fertilizer will increase the activity of SOD (superoxide dismutase, anti-aging effect) in cotton leaves, delay the initial life of cotton and prevent premature aging of cotton. Increasing the application of potassium fertilizer can increase the number of bolls per plant, single boll weight and clothing score, and increase yield.

In addition, potassium application will significantly improve the fiber quality of cotton. The application of potassium contributes to the elongation of the fiber, thereby increasing the length of the fiber; it can increase the secondary wall thickness of the cotton fiber and increase the strength of the fiber. In addition to fiber length and fiber strength, fiber quality traits include fiber elongation, fineness, uniformity, maturity, and micronaire value. Potassium application can increase fiber elongation, uniformity, and micronaire value, and improve fiber maturity. Among them, cotton fiber elongation and micronaire value have the greatest influence, followed by fiber length and strength, and have little effect on fiber uniformity and fineness.
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