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Soils > Diagnostic horizon and designation > Flashcards

Diagnostic horizon and designation Flashcards

1
Q

Mollic - surface horizon

A

(A) Thick, dark colored, high base saturation, strong structure

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2
Q

Umbric - surface horizon

A

(A) Same as except low base satruation

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3
Q

Ochric - surface horizon

A

(A) Light colored, low organic content, may be hard and massive when dry

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4
Q

Melanic - surface horizon

A

(A) Thick, black, high in organic matter (>6% organic C) common in volcanic ash soils

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5
Q

Histic - surface horizon

A

(O) Very high in organic content, wet during some part of year

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6
Q

Anthropic - surface horizon

A

(A) Human-modified mollic-like horizon, high in available P

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7
Q

Plaggan - surface horizon

A

(A) Human-made sodlike horizon created by years of manuring

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8
Q

Argillic - subsurface horizon

A

(Bt) Silicate clay accumulation

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9
Q

Natric - subsurface horizon

A

(Btn) Argillic, high in sodium, columnar or prismatic structure

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10
Q

Spodic - subsurface horizon

A

(Bhs) Organic matter, Fe and Al oxides accumulation

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11
Q

Cambic - subsurface horizon

A

(B) Changed or altered by physical movement or by chemical reaction

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12
Q

Agric - subsurface horizon

A

(A or B) Organic and clay accumulation just below plow layer resulting from cultivation

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13
Q

Oxic - subsurface horizon

A

(Bo) Highly weathered, primarily mixture of Fe, Al oxides and non-sticky-type silicate clays

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14
Q

Duripan - subsurface horizon

A

(m) Hardpan, strong cemented by silica

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15
Q

Fragipan - subsurface horizon

A

(x) Brittle pan, usually loamy textured, weakly cemented

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16
Q

Albic - subsurface horizon

A

(E) Light colored, clay and Fe and Al oxides mostly removed

17
Q

Calcic - subsurface horizon

A

(k) Accumulation of CaCO3 or CaCO3 - MgCO3

18
Q

Gypsic - subsurface horizon

A

(y) Accumulation of gypsum

19
Q

Salic - subsurface horizon

A

(z) Accumulation of salts

20
Q

Kandic - subsurface horizon

A

Accumulation of low-activity clays

21
Q

Petrocalcic - subsurface horizon

A

Cemented calcic horizon

22
Q

Petrogypsic - subsurface horizon

A

cemented gypsic horizon

23
Q

Placic - subsurface horizon

A

Thin pan cemented with iron alone or with manganese or organic matter

24
Q

Sombric - subsurface horizon

A

Organic matter accumulation

25
Q

Sulfuric - subsurface horizon

A

Highly acid with Jarosite mottles

Soils (4 decks)

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