nitrate bed

例句：

1. 1. The soil in this area is rich in nitrates, which makes it ideal for growing crops.
   这个地区的土壤富含硝酸盐，非常适合种植作物。
2. 2. The farmers use nitrate beds to enrich the soil with nutrients.
   农民使用硝酸盐床来给土壤补充养分。
3. 3.The nitrate beds are designed to prevent water pollution and improve water quality.
   硝酸盐床的设计旨在防止水污染和改善水质。