inert humus

例句：

1. 1.The soil in this area is rich in inert humus, which is essential for plant growth.
   该地区的土壤富含惰性腐殖土，对植物生长至关重要。
2. 2.In order to improve soil fertility, farmers often add inert humus to their fields.
   为了提高土壤肥力，农民经常在田地里添加惰性腐殖土。
3. 3. The inert humus in the soil helps to retain moisture and prevent erosion.
   土壤中的惰性腐殖土有助于保持水分和防止侵蚀。