tagged soil

例句：

1. 1. The research team found that the tagged soil had a higher concentration of nutrients than the surrounding unmarked soil.
   研究团队发现，标记土壤中的养分浓度比周围的未标记土壤高。
2. 2.In this experiment, we used tagged soil to study the effects of different fertilizers on plant growth.
   在这个实验中，我们使用了标记土壤来研究不同肥料对植物生长的影响。
3. 3. The farmers carefully marked their soil with labels before planting, so they could easily identify which plants were in need of extra water or nutrients.
   农民们在种植前小心地给土壤做标记，以便他们能够轻松地识别哪些植物需要额外的水分或养分。