Science · Soils
Andosol
WRB soils defined by andic or vitric diagnostic properties; not an exact synonym in every case for USDA Andisol.
WRB Reference Soil Group
Profile
- System
- World Reference Base classification
- Origin
- Frequently volcanic parent materials
- Retention
- Often high water retention, with variable plant availability
- Chemistry
- Strong phosphate sorption may occur
Water & soil targets
- Moisture (VWC)
- Site-calibrated; measure field capacity and dry-down
- Salinity tolerance
- Not inferable from soil classification; test EC, sodicity and water chemistry
- Drought tolerance
- Not inferable from taxonomy; measure accessible storage and plant response
Soil orders and WRB groups are not textures. Determine horizon-specific retention, field capacity, drainage, rooting depth and seasonal hydrology before setting irrigation triggers.
Problems to watch
- Phosphorus limitation
- Compaction
- Irreversible changes after severe drying in some materials
Stress signs
- Stunted vegetation
- Dense wheel tracks
- Altered rewetting
Where you'll find it
- WRB soil mapping
- Volcanic-soil management
More soils
All Science profilesGeneral agronomic guidance and typical ranges; actual targets vary by site, soil, climate and season.