1. Application of swelling fertilizer: Apply 15 kg of superphosphate per acre, along with 10 kg of ammonium sulfate. Additionally, spray a solution of 0.3% potassium dihydrogen phosphate and 1% urea to promote healthy growth and root development during the critical swelling stage of the sweet potato tubers.
2. Drainage and waterlogging management: During the root swelling period, excessive rainfall can lead to waterlogging, which negatively affects crop health. It's essential to maintain proper drainage by dredging ditches regularly to prevent standing water and ensure good soil aeration.
3. Leaf roller moth control: The sweet potato leaf roller moth can cause severe damage by feeding on leaves, potentially defoliating entire plants. To manage this pest effectively, apply 32% emulsifiable concentrate at a dilution of 3200 times before the larvae reach the third instar stage. Spraying should be done in the late afternoon, after 5 o'clock, when the temperature is cooler and the insects are more active. For fields with high infestation levels, it's recommended to repeat the application every 3-5 days to maintain effective control.
By following these practices, farmers can significantly improve the yield and quality of their sweet potato crops while minimizing the risk of pests and environmental stressors. Proper timing and attention to field conditions are crucial for successful cultivation.
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