soil extract's chemical composition

例句：

1. 1.The soil extract was used to test the effectiveness of the fertilizer.
   土壤提取物被用来测试肥料的有效性。
2. 2. The researcher extracted a significant amount of information from the soil extract.
   研究员从土壤提取物中提取了大量的信息。
3. 3.The soil extract is a valuable resource for studying plant growth.
   土壤提取物是研究植物生长的一个宝贵的资源。