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Anthropic epipedon
Mineral soil material that shows some evidence of disturbance by human activity (mixing of the upper 18cm)
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Folistic Epipedon
A layer that is saturated for less than 30 days in normal years and is 20cm or more thick or is an Ap horizon
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Histic Epipedon
A layer that is characterized by saturation for more than 30 days and reduction for some time during normal years
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Mollic Epipedon
Color value of 4 or 5
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Ochric Epipedon
Fails to meat definitions for the other seven epipedons
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Umbric Epipedon
dominant colors with a value of 3 or less
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Agric Horizon
illuvial horizon that has formed under cultivation and contains significant amounts of illuvial silt, clay, and humus. Directly below the Ap horizon
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Argillic Horizon
Subsurface horizon with higher percentage of clay than the overlying horizon. May be exposed by erosion.
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Calcic Horizon
An illuvial horizon in which secondary calcium carbonates have accumulated15% or more CaCO3 equivalent.
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Cambic Horizon
Result of physicalalterations, chemical transformations, or removals. 15 cm thick or more.
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Duripan
Silica cemented subsurface horizon
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Fragipan
15cm thick, evidence of pedogenesis, coarse structure, not effervescent.
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Glossic Horizon
result of degradation of an argillic, kandic, or natric horizon from which clay and free iron oxides are removed.
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Gypsic
Gypsum has accumulated or been transformed
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Kandic Horizon
vertically continuous subsurface horizon that underlies a coarser textured surface horizon.
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Natric horizon
illuvial horizon that is normally present in the subsurface and has a significantly higher percentage of silicate clay than the overlying horizons. Evidence of clay illuviation accelerated by sodium
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Oxic Horison
Subsurface horizon that does not have andic properies and is 30 cm thick or more.
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Spodic Horizon
illuvial layer with 85% more spodic materials. Subsurface horizon
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Soil Moisture regimes
Aquic (saturated with water), Aridic and Torric (arid climates) Udic (not dry in any part for as long as 90 cumulative days, soil temp is lower than 22C; humid climates) Ustic (intermediat bn aridic and udic; moisture is limited but present; tropical and subtropical) Xeric (Mediterranean dry in all parts for 45 or more days
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Soil Termperature Regimes
Gelic (Annual soil temp at or below 0C) Cryic (0-8C) Frigid(soil warmer than cryic in summer) Mesic (8-15C) Thermic (15-22) Hyperthermic (22+)
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