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Questions and Answers
What does the term 'mollic' refer to?
What does the term 'mollic' refer to?
- Argillic; BS > 35% in argillic (A-E-Bt-C)
- Thick (>10") dark, BS > 50% (correct)
- Thick, dark, BS < 50%
- Light, lower in OM, thinner than mollic & umbric, BS 50% (A-B-C)
What is an umbric soil characteristic?
What is an umbric soil characteristic?
- Argillic; BS > 35% in argillic (A-E-Bt-C)
- Thick, dark, BS < 50% (correct)
- Light, lower in OM, thinner than mollic & umbric, BS 50% (A-B-C)
- Thick (>10") dark, BS > 50%
What does 'ochric' soil indicate?
What does 'ochric' soil indicate?
- Thick (>10") dark, BS > 50%
- Light, lower in OM, thinner than mollic & umbric, BS 50% (A-B-C) (correct)
- Thick, dark, BS < 50%
- Argillic; BS > 35% in argillic (A-E-Bt-C)
Alfisol is characterized by what feature?
Alfisol is characterized by what feature?
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What is a characteristic of a spodosol?
What is a characteristic of a spodosol?
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What is the definition of 'ultisols'?
What is the definition of 'ultisols'?
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Study Notes
Soil Horizons and Terms
- Mollic: Characterized by a thickness exceeding 10 inches, dark color, and base saturation (BS) greater than 50%.
- Umbric: Similar thickness to mollic soils but with a darker color and base saturation less than 50%.
- Ochric: Comprises lighter soil, generally lower in organic matter, thinner than both mollic and umbric soils, with base saturation around 50% across horizons A, B, and C.
Soil Orders
- Alfisols: Defined by an argillic horizon; base saturation is greater than 35% in the argillic layer (A-E-Bt-C).
- Spodosols: Contain a spodic horizon, characterized by acidity and low base saturation (A-E-Bhs-C).
- Ultisols: Characterized by an argillic horizon; base saturation is typically low, indicating weathered conditions.
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