contract tillage

例句：

1. 1. The government has introduced a new contractual tillage policy to improve soil health.
   政府推出了一项新的合同耕作政策，以改善土壤健康。
2. 2. This contractual tillage system is designed to optimize crop yields and reduce environmental impacts.
   这种合同耕作系统旨在优化作物产量并减少环境影响。
3. 3.The farmers are required to adhere to the terms of the contractual tillage agreement to maintain their land's productivity.
   农民们必须遵守合同耕作协议的条款，以保持土地的生产力。