The National Soil Erosion Research Laboratory
The term soil structure refers to the arrangement and organization of the particles which make up our soil. These particles can be arranged in a loose and haphazard manner, or they can form a distinct, uniformly structured pattern.
Basically, there are three broad categories of soil structure:
By controlling a soil's pore shape, size, and distribution, soil structure is the major factor in determining a soil's ability to retain and transmit fluids. Thus, it is very important that one knows a specific soil's structure in order to manage it efficiently.