The active organic matter corresponds to the labile fraction of the total organic matter. This fraction is easily degraded by soil microorganisms, which is why it represents the greatest source of energy for them and a large part of the mineralizable nitrogen for plants. In addition, it is responsible for beneficial effects on the soil structure (improving aeration, water infiltration, resistance to erosion and ease of tillage). It constitutes an indicator of the dynamics of the soil and its quality, since a good microbial activity in the soil is the reflection of optimal physical and chemical conditions that allow the development of metabolic processes of bacteria, fungi, algae, actinomycetes and their action on the decomposition of organic substrates.