In the period of rapid expansion of sweet potatoes, fertilizers such as superphosphate and magnesium sulfate can be used to repel insects from the ground and improve the insect resistance of sweet potatoes.
When the soil is wet after the rain, use superphosphate 25 to 30 times in the morning or evening to mix with the ash leaching solution, or use the tobacco leachate 15 to 20 times, each time pouring 5 to 6 kg per square meter. Every 10 to 15 days, continuous pouring 2 or 3 times, can protect sweet potatoes from the harm of underground pests. If you add 80 to 100 times magnesium sulfate with the effect of better.
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