Unit 2 chapt. We will now discover the clues used to name the horizons in the soil profile and will begin with soil structure. This will be studied in Unit 3 . Soil separates do not act in the soil as individuals, but as partners, or aggregates.
Aggregates are the clumps of soil separates.
When aggregates are bound together into larger masses they are called PEDS . Soil clods can be broken apart by wetting and drying, and by freezing and thawing. Cementing agents which bind soil separates together include microbial gums, iron oxides, organic matter, and clay. Types of Structure 1. This photo shows a well-granulated A horizon.