soil classification

例句：

1. 1. Soil classification is essential for understanding the environmental impact of agriculture.
   土壤分类对于理解农业对环境的影响至关重要。
2. 2.The soil classification system is used to classify different types of soil based on their physical and chemical properties.
   土壤分类系统用于根据其物理和化学属性将不同类型的土壤进行分类。
3. 3. In this study, we classified the soil samples into three categories based on their texture and organic matter content.
   在这项研究中，我们根据土壤样本的质地和有机质含量将其分为三个类别。