Sweet potato cultivation: how to control underground pests without pollution?

How does sweet potato control underground pests without pollution? Please introduce the method of planting sweet potato, which is easy to be damaged by underground pests, form insect path, make sweet potato rot, reduce its quality, and cannot be eaten seriously, resulting in reduced production and loss of harvest. Can refer to the following pollution-free methods to control sweet potato underground pests, not only without any toxic residues, but also will not pollute sweet potatoes, but also will not harm human health. During the period of rapid expansion of sweet potato, the root of sweet potato should be drenched with 25 × 30 times calcium superphosphate and dry pure plant ash every 10 ~ 15 days, or 10 ~ 15 times of tea bran, or 15 ~ 20 times of tobacco leaf, etc., for 2 times in a row, about 5 kg per square meter of soil each time. When the soil is slightly moist after rain, or drenched in the morning or evening, the underground pests harmful to sweet potatoes can be killed and sweet potatoes can be protected. If 80 times of 100-fold magnesium sulfate solution is added together, the effect is better, which can not only improve the control effect, enhance the insect resistance of sweet potato, but also promote the rapid expansion of sweet potato, increase starch accumulation, significantly increase yield, improve quality and prolong storability. Click to get more sweet potato planting techniques click to get more vegetable planting techniques