What does the term "soil structure" refer to?

The term "soil structure" specifically refers to the arrangement of soil particles into aggregates, which can take various forms such as granules, blocks, or prisms. This structure plays a crucial role in determining how water and air move through the soil, affects root development, and influences microbial activity. Well-structured soil promotes better drainage and aeration, which are essential for healthy plant growth.

Understanding soil structure is fundamental in soil evaluation because it affects not only the physical properties of the soil but also its fertility and overall health. In contrast, the other terms—chemical composition, moisture content, and soil profile layers—address different characteristics of soil that do not pertain to the specific arrangement of particles that defines soil structure.