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Soil Classification (USDA Taxonomy) E2 Flashcards

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Soil Classification (USDA Taxonomy) E2 Flashcards

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Questions and Answers

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?

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?

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?

Argillic; BS > 35% in argillic (A-E-Bt-C) Signup and view all the answers

What is a characteristic of a spodosol?

Spodic; acidic, low BS (A-E-Bhs-C) Signup and view all the answers

What is the definition of 'ultisols'?

Argillic; BS Signup and view all the answers

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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Description

Test your knowledge on soil classification using USDA soil taxonomy with these flashcards. Each card presents a key term along with its definition, helping you master essential concepts like mollic, umbric, and alfisol. Perfect for students and professionals in soil science or agriculture.