土壤施药
Soil application
以上为机器翻译结果，长、整句建议使用 人工翻译 。
由于地下病虫害发生在土壤深处，普通施药机械的药液难以深入土层，给防治带来困难。
As the soil pests live in the soil depths, the pesticide spraying by ordinary sprayer can't enter into soil, It is very difficult to get rid of them.
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