Soil structure is how the particles (sand, silt and clay) are built, glued, cemented, or aggregated together to ideally form a “crumb structure” (peds).

The glues of the soil are: “Humus” and to a lesser extent bulky organic matter which in time becomes Humus; Clay colloids; Minerals such as calcium, magnesium, potassium; Gums secreted by some plant roots; Adhesion between particles is via electrostatic force (flocculation) or cementing substances.