From mid-August to September, the upper leaves of the main stem of cotton turned from pale yellow to dark green. The macules appear between the green veins, and then become brown, and the leaves shrink, become brittle, turn reddish-brown and fall off. This phenomenon is the disease of red leaf blight (a physiological disease caused by the plant lack of potassium), which seriously affects the yield. . Practice has proved that high-energy red potassium prevention and treatment of cotton stem blight has special effects. The specific method is as follows:
1. 25-30 cm deep before sowing. If there is no deep-sweeping condition, a soil conditioner can be applied before the planting per acre by using a sprayer, which can be used for “less deep plowing†200 yuan, to loosen and penetrate deeper 30-50 centimeters of soil, promote root development to deeper layers, and enhance absorption capacity. .
2. Before sowing, 30 kg of potassium sulfate compound fertilizer was applied per acre.
3. After the seedlings were released, they were withdrawn early in late May, prompting the root system to develop deeper. In June and August, spraying "potassium red in high energy" every 20 days to supplement potassium fertilizer. Together with a package of “Shufeng 481â€, it promotes photosynthesis of leaves and enhances the absorption capacity of the root system.
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