Microbial biomass (bacteria and fungi) is a measure of the weight of a living organism in the soil. Microbial biomass decomposes plant and animal fossils as well as living soil to release carbon dioxide and plant nutrients. Cultivation programs that replenish crop residues (e.g. no cultivation) often increase microbial biomass. Soil properties such as pH, clay, and the presence of living carbon all influence the size of the microbial biomass.
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