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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. 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

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  1. Soil Geography • Sources • http://soils.ag.uidaho.edu/soilorders • http://www.geo.wvu.edu/~kite/2002SoilsHandout.htm

  2. 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

  3. Soil Textures

  4. Texture Families

  5. Entisol Order • recent • Soils of recent origin • Floodplains • Steep, rocky • Having only an A horizon

  6. Entisol Suborders • http://soils.ag.uidaho.edu/soilorders

  7. loamy-skeletal, mixed, superactive, nonacid, mesic Lithic Xerorthent http://soils.ag.uidaho.edu/soilorders

  8. 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.

  9. Palouse Series Haploxeroll A AB BW1 BW2

  10. Mollisols in the U.S. • http://soils.ag.uidaho.edu/soilorders

  11. Mollisol Suborders • http://soils.ag.uidaho.edu/soilorders

  12. Cryoll Landscape http://soils.ag.uidaho.edu/soilorders

  13. fine-loamy, mixed, superactive Pachic Argicryoll http://soils.ag.uidaho.edu/soilorders

  14. Argixeroll Landscape • http://soils.ag.uidaho.edu/soilorders

  15. loamy-skeletal, mixed, superactive, mesic Lithic Argixeroll http://soils.ag.uidaho.edu/soilorders

  16. Alfisol Order • Moderately leached forest soils. • Clay accumulation in subsurface horizon. • Fertile soils.

  17. Alfisol Landscape http://soils.ag.uidaho.edu/soilorders

  18. fine-loamy, mixed, superactive Typic Haplocryalf http://soils.ag.uidaho.edu/soilorders

  19. Spodosol Order • od, spodos, wood ashes. • Acid soils with subsurface accumulation of humus and Al & Fe oxides. • Highly leached E horizon.

  20. Spodosol Landscape • http://soils.ag.uidaho.edu/soilorders

  21. medial over loamy, • Andic Haplocryod • http://soils.ag.uidaho.edu/soilorders

  22. Inceptisol Order • ept, inceptum, beginning • Minimal horizon development. • Steep slopes, young geomorphic surfaces, resistant parent materials.

  23. Inceptisol Suborders • http://soils.ag.uidaho.edu/soilorders

  24. Inceptisol Landscape • http://soils.ag.uidaho.edu/soilorders

  25. loamy-skeletal, mixed, • active • Xeric Dystrocryept • http://soils.ag.uidaho.edu/soilorders

  26. loamy-skeletal, mixed, • superactive • Humic Eutrocryept • http://soils.ag.uidaho.edu/soilorders

  27. 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.

  28. Andisol Suborders • http://soils.ag.uidaho.edu/soilorders

  29. Volcanic Glass • http://soils.ag.uidaho.edu/soilorders

  30. ashy over sandy-skeletal • frigid • Typic Vitrixerand • http://soils.ag.uidaho.edu/soilorders

  31. Histosol Order • ist, histos, tissue • Mainly organic materials • Restricted drainage to inhibit decomposition of plant materials • High carbon, wetlands

  32. Haplosaprist Landscape http://soils.ag.uidaho.edu/soilorders

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

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