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Soil Geography. Sources http://soils.ag.uidaho.edu/soilorders http://www.geo.wvu.edu/~kite/2002SoilsHandout.htm. Theoretical Model of Soil. The Jenny equation (1941) S=f(o, cl, r, p, t) o=organisms cl=climate r=relief p=parent material t=time. Soil Textures. Texture Families.

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soil geography
Soil Geography
  • Sources
    • http://soils.ag.uidaho.edu/soilorders
    • http://www.geo.wvu.edu/~kite/2002SoilsHandout.htm
theoretical model of soil
Theoretical Model of Soil
  • The Jenny equation (1941)
    • S=f(o, cl, r, p, t)
    • o=organisms
    • cl=climate
    • r=relief
    • p=parent material
    • t=time
entisol order
Entisol Order
  • recent
  • Soils of recent origin
  • Floodplains
  • Steep, rocky
  • Having only an A horizon
entisol suborders
Entisol Suborders
  • http://soils.ag.uidaho.edu/soilorders
slide7
loamy-skeletal, mixed,

superactive, nonacid,

mesic Lithic Xerorthent

http://soils.ag.uidaho.edu/soilorders

the mollisol order
The Mollisol Order
  • mollis, soft
  • Formed under influence of grassland.
  • Insufficient precipitation to leach the soil.
    • Long-term addition of organic materials from plant roots.
    • Deep, dark colored surface horizon.
    • Fertile soils.
slide9

Palouse Series

Haploxeroll

A

AB

BW1

BW2

mollisols in the u s
Mollisols in the U.S.
  • http://soils.ag.uidaho.edu/soilorders
mollisol suborders
Mollisol Suborders
  • http://soils.ag.uidaho.edu/soilorders
cryoll landscape
Cryoll Landscape

http://soils.ag.uidaho.edu/soilorders

slide13
fine-loamy, mixed,

superactive

Pachic Argicryoll

http://soils.ag.uidaho.edu/soilorders

argixeroll landscape
Argixeroll Landscape
  • http://soils.ag.uidaho.edu/soilorders
slide15
loamy-skeletal, mixed,

superactive, mesic

Lithic Argixeroll

http://soils.ag.uidaho.edu/soilorders

alfisol order
Alfisol Order
  • Moderately leached forest soils.
  • Clay accumulation in subsurface horizon.
  • Fertile soils.
alfisol landscape
Alfisol Landscape

http://soils.ag.uidaho.edu/soilorders

slide18
fine-loamy, mixed,

superactive

Typic Haplocryalf

http://soils.ag.uidaho.edu/soilorders

spodosol order
Spodosol Order
  • od, spodos, wood ashes.
  • Acid soils with subsurface accumulation of humus and Al & Fe oxides.
  • Highly leached E horizon.
spodosol landscape
Spodosol Landscape
  • http://soils.ag.uidaho.edu/soilorders
slide21
medial over loamy,
  • Andic Haplocryod
  • http://soils.ag.uidaho.edu/soilorders
inceptisol order
Inceptisol Order
  • ept, inceptum, beginning
  • Minimal horizon development.
    • Steep slopes, young geomorphic surfaces, resistant parent materials.
inceptisol suborders
Inceptisol Suborders
  • http://soils.ag.uidaho.edu/soilorders
inceptisol landscape
Inceptisol Landscape
  • http://soils.ag.uidaho.edu/soilorders
slide26
loamy-skeletal, mixed,
  • active
  • Xeric Dystrocryept
  • http://soils.ag.uidaho.edu/soilorders
slide27
loamy-skeletal, mixed,
  • superactive
  • Humic Eutrocryept
  • http://soils.ag.uidaho.edu/soilorders
andisol order
Andisol Order
  • Primarily soils formed in volcanic ash.
  • Dominated by glass and weathering products of glass.
  • High water-holding capacity.
  • Will ‘fix’ large quantities of phosphorus.
andisol suborders
Andisol Suborders
  • http://soils.ag.uidaho.edu/soilorders
volcanic glass
Volcanic Glass
  • http://soils.ag.uidaho.edu/soilorders
slide31
ashy over sandy-skeletal
  • frigid
  • Typic Vitrixerand
  • http://soils.ag.uidaho.edu/soilorders
histosol order
Histosol Order
  • ist, histos, tissue
  • Mainly organic materials
  • Restricted drainage to inhibit decomposition of plant materials
  • High carbon, wetlands
haplosaprist landscape
Haplosaprist Landscape

http://soils.ag.uidaho.edu/soilorders

slide34
euic, frigid
  • Typic Haplosaprist
  • http://soils.ag.uidaho.edu/soilorders
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