AGRY 565 Final

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  1. Critiera For Mollic
    • Good Structure
    • Color less than or equal to 3/3
    • B.S. is greater than or equal to 50%
    • 25cm thick if solum is 75cm thick
    • Does not have properties of any other epipedons
  2. Prairie Peninsula
    • Temp during drought years is higher
    • Lower precip in winter
    • therefore grasses
    • therefore mollisol
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    Alfisol
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    Andisols
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    Aridisol
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    Entisol
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    Histiosol
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    Inceptisol
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    Mollisol
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    Oxisol
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    Spodosol
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    Ultisol
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    Vertisol
  14. Conditions for Fe3+ Reduction in Soil
    • Saturation with water
    • Microorganisms must be present
    • organic matter must be present the soil temp mus be above ~5 C
  15. Fe2+
    • Reduced
    • soluable
  16. Fe3+
    • Oxidized
    • goethite, hematite, etc
  17. How long for Oxidation and reduction
    • Oxidation- seconds and minutes
    • Depleted- weeks
  18. Modeling model I
    • Reduced for long periods of time, occasionally oxidized
    • gray ped interiors
    • brown ped faces
  19. Mottlind Model II
    • Usually oxidized occasionally reduced
    • brown ped interiors
    • gray ped faces
  20. Moisture: Aquic
    • –  saturated several weeks each year
    • –  reducing conditions
    • –  low chroma (gray) colors
    • –  receives run-on
  21. Moisture: Perudic
    • –  very humid climate
    • –  soil remains very most year-round, but not aquic
    • –  precipitation > PE every month
    • –  large surplus, no deficit
  22. Moisture: Udic
    • Humid Climate
    • sruplus, lettle or no deficit
    • where you can grow corn/beans w/o irrigation
  23. Moisture: Ustic
    • Semi-arid climate
    • moderate deficit, little or no surplus
    • need irrigation for corn
  24. Moisture: Aridic
    • Desert climate
    • large deficit, no surplus
    • have to irrigate
  25. Moisture: Xeric
    • Mediterranean climate
    • Moderate surplus, moderate deficit
    • good for grapes
  26. Temperature Regime: Montana
    Frigid (cryic)
  27. Temperature Regime: Midwest and plains
    Mesic
  28. Temperature Regime: Southeast and N. Texas
    Thermic
  29. Most of Alaska, Temperature Regime
    Pergelic
  30. Tip of Florida and Texas, Temperature Regime
    Hyperthermic
  31. Conditions to make a fragipan
    • Forest
    • thick layer of silt
    • limiting layer (till)
    • acid (less than or = 6)
    • less than 12% slope
    • Enough time
  32. Genetic Thread under:
    Warm, subhumid-humid, forest
    Entisol, Inceptisol, Alfisol, ultisol, Oxisol
  33. Genetic Thread under:
    Cool, humid, sandy forests
    Entisol, Inceptisol, Spodosol
  34. Genetic Thread Under:
    Semihumid, semiarid, calcareous, prarire
    Entisol, Inceptisol, Mollisol
Author:
MRK
ID:
251275
Card Set:
AGRY 565 Final
Updated:
2013-12-09 20:14:30
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