- Entisols are defined as soils that do not show any profile development other than an A horizon
- Have no diagnostic horizons, and most are basically unaltered from their parent material, which can be unconsolidated sediment or rock
- Are the 2nd most abundant soil order (after Inceptisols), occupying ~16% of the global ice-free land area
- Resistant or unweatherable parent materials - sand, iron oxide, aluminum oxide, kaolinite clay
- Erosion - common on shoulder slopes; other kinds also important
- Deposition - continuous, repeated deposition of new parent materials by water, wind, colluvium, mudflows, other means
- Cool climate - not cold enough in winter for permafrost
- Shallow depth to bedrock - rock may be resistant to weathering, such as quartzite or ironstone
- Toxic parent materials - serpentine soil, mine soils, sulfidic clays
- Known as the ‘Wet Entisols’
- Supports vegetation that tolerates periodic to permanent wetness
- Do not have distinct horizons due to plowing
- Important irrigation crop production soils in California
- Mostly used for crops, urban land, & pastures
- Some are used as wildlife habitats
- Free draining Entisols in recent water-deposited sediments on flood plains, fans, & deltas along rivers & streams
- Most are frequently flooded unless protected by dams or levees
- Largest areas occur in flood plains along the Mississippi River
- Most used as rangeland, forests, pastures, & wildlife habitat
- Some can be used as cropland
- Mainly present in the Western States
- Commonly on recently eroded surfaces
- Mostly used for rangeland, pastures & wildlife habitat
- Among most productive rangeland in arid & semiarid climates
- Some can be nearly bare due to erosion
- Provides poor support for vehicles
- Common landscapes include
- flood plains of rivers & streams
- Can also be found on older more stable landscapes
- Entisols often have use limitations & can be easily degraded due to:
- Entisols along river floodplains are often intensively farmed & are some of the most agriculturally productive soils in the world
- Entisols are the most abundant soil order.
- What are 3 causes of delayed or absent development?
- What are the 5 main suborders of Entisols?
- Entisols are what percentage of global ice-free land area?
- Brady, Nyle C.; Ray R. Weil. The Nature & Properties of Soils. Chapter 3. Section 3.5 Entisols (Recent: Little if Any Profile Development). Pgs 90-92.
- USDA Natural Resources Conservation Service
- http://soils.usda.gov/technical/classification/or ders/entisols_map.html