Structure is the arrangement of sands, silts and clays into stable
aggregates.
Aggregates are secondary units or granules composed of many
soil particles held together by organic substances, iron oxide, clays
Carbonates and/or silica.
Natural aggregates are call ”peds” or soil structure units. Soil
Structure unit are described by 3 characteristics: type (shape),
Class (size) and grade (strength of cohesion).
Soil structure influences many important properties of soil, such as
The rate of infiltration of water. Both granular and single-grain soils have
rapid infiltration rate; blocky and prismatic soils have moderate rates and
platy and massive soil conditions have slow infiltration rate.