根据腐殖质与矿物质土壤的结合程度、分解作用中所含的有机物类型以及原有的植被，腐殖质可区分为几个类型。
Humus is classified according to how well it is incorporated into the mineral soil, the types of organisms involved in its decomposition, and the vegetation from which it is derived.
植物从土壤中吸取矿物质和其他养分。
令他们高兴的是，他们觉得这样可以使田地里的土壤富含矿物质，更加肥沃。
To their delight, they feel that this makes the soil in their fields richer in minerals and so more fertile.
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