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Soil Orders
The 12 Soil Orders
13
Agriculture
Undergraduate 3
09/14/2014

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Cards

Term
Entisols
Definition
Youngest of the soils, least developed, lack horizons
Term
Inceptisols
Definition
Slightly more developed and weathered than entisols, "B" horizon
Term
Andisols
Definition
volcanic ash soils, highly productive
Term
Gelisols
Definition
permafrost soils, higher elevations and latitudes
Term
Histosols
Definition
very high organic matter content (peat)
Term
Aridisols
Definition
desert soils, very limited leaching, basic
Term
Vertisols
Definition
dark, swelling and cracking from high clay content
Term
Mollisols
Definition
deep, high organic content, basic, moderately developed (grassland soil)
Term
Alfisols
Definition
leached more than mollisols, (clay leached out of surface layer), (deciduous forest soil)
Term
Ultisols
Definition
most highly leached soils, humid areas, typically acidic with limited nutrients, clay leached into B layer
Term
Spodosols
Definition
leached mineral soil (with less clay than ultisols), low base supply (coniferous forest soils)
Term
Oxisols
Definition
oxic horizon, high organic matter content, highly weather of tropical or subtropical regions
Term
5 soil forming factors
Definition
-Time
-Parent Material
-Climate
-Topography
-Biological factors
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