Soil organic matter consists of the remains of plants and animals in varying stages of decomposition. Organic matter can fall into one of three types: plant residues and living microbial biomass; active organic matter, otherwise known as detritus; or stable soil organic matter, otherwise known as humus. The living microbial biomass and detritus contribute to the fertility of the soil and the release of nutrients from decomposition. Humus is the end result of decomposition and is considered stable organic matter. This contributes to the structure, tillage, cation exchange capacity and dark color of the soil.
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