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Soil Order Key

QuestionAnswer
Soils with permafrost w/in 100 cm or cryoturbation and permafrost w/in 200 cm Gelisols
Soils with organic soil materials extending down to an impermeable layer or with an organic layer that is more than 40 cm thick and w/out andic properties Histosols
Soils with a spodic horizon w/in 2 m of soil surface and without andic properties Spodosols
Soils with andic properties (low density, glass, pumice, short-range order minerals) Andisols
Soils with an oxic horizon within 150 cm of soil surface Oxisols
Soils with 30% or more clay to a depth of 50 cm and shrinking/swelling properties Vertisols
Soils with an aridic soil moisture regime and some B horizon development of a salic horizon Aridisols
Soils with an argillic or kandic horizon or fragipan and a base saturation of < 35% at 2 m depth or 75 cm below a fragipan Ultisols
Soils with a mollic epipedon and a base saturation of > 50% to an impermeable layer or at 1.8 m from soil surface Mollisols
Soils with an argillic, kandic or natric horizon or a fragipan with clay skins Alfisols
Soils with a cambic, sulfuric, calcic, petrocalcic, or petrogypsic horizon, or with a mollic, umbric, or histic opipedon, or with an exchangeable sodium percentage (ESP) of > 15% or a fragipan Inceptisols
Other soils Entisols
Created by: 1505727526
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