The term 'aggregate' in soil science typically refers to what?

The term 'aggregate' in soil science specifically refers to the structure formed by groups of soil particles that bond together. This aggregation is essential for understanding soil health and functionality, as it influences various soil properties such as porosity, permeability, and aeration. Well-formed aggregates allow for better water infiltration and root growth, while also enhancing biological activity within the soil.

In contrast, individual soil particles refer to the smallest units of soil that can exist independently, but they do not provide the context of collective structure that aggregates represent. The layer of soil beneath the topsoil pertains to the soil profile and does not specifically relate to the concept of aggregation. Organic matter is important for soil fertility and structure but is not synonymous with aggregates themselves; rather, it can be a factor in promoting aggregation. Understanding aggregates is key to managing soil effectively for erosion control and maintaining soil health.