subsoil tillage

例句：

1. 1. The farmers use subsoil tillage techniques to improve the quality of their crops.
   农民们使用土壤耕作技术来提高作物的质量。
2. 2. Subsoil tillage is an important part of maintaining healthy soil conditions.
   土壤耕作是保持土壤健康状态的重要部分。
3. 3. During the spring thaw, farmers often perform subsoil tillage to prepare the ground for planting.
   在春天解冻期间，农民经常进行土壤耕作，为种植做准备。