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Inceptisols are a soil order in
USDA soil taxonomy USDA soil taxonomy (ST) developed by the United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification of soil types according to several parameters (most commonly their properties) and in ...
. They form quickly through alteration of parent material. They are more developed than
Entisols Entisols are soils defined in USDA soil taxonomy that do not show any profile development other than an A horizon. An entisol has no diagnostic horizons, and most are basically unaltered from their parent material, which can be unconsolidated s ...
. They have no accumulation of clays,
iron oxide Iron oxides are chemical compounds composed of iron and oxygen. Several iron oxides are recognized. All are black magnetic solids. Often they are non-stoichiometric. Oxyhydroxides are a related class of compounds, perhaps the best known of wh ...
, aluminium oxide or organic matter. They have an ochric or
umbric horizon The umbric horizon (''Latin: umbra, shade'') is a thick, dark coloured, surface soil horizon rich in organic matter. It is identified by its dark colour and structure. Normally it has a pH of less than 5.5 representing a base saturation of less tha ...
and a cambic subsurface horizon. In the
World Reference Base for Soil Resources The World Reference Base for Soil Resources (WRB) is an international soil classification system for naming soils and creating legends for soil maps. The currently valid version is the fourth edition 2022. It is edited by a working group of the In ...
(WRB), most Inceptisols are
Cambisol A Cambisol in the World Reference Base for Soil Resources (WRB) is a soil in the beginning of soil formation. The horizon differentiation is weak. This is evident from weak, mostly brownish discolouration and/or structure formation in the soil p ...
s or
Umbrisol In soil classification, an Umbrisol is a soil with a dark topsoil and in which organic matter has accumulated within the mineral surface soil—in most cases with low base saturation—to the extent that it significantly affects the behavi ...
s. Some may be Nitisols. Many Aquepts belong to
Gleysol A gleysol is a wetland soil ( hydric soil) that, unless drained, is saturated with groundwater for long enough to develop a characteristic colour pattern. The pattern is essentially made up of reddish, brownish, or yellowish colours at surfaces ...
s and
Stagnosol A Stagnosol in the World Reference Base for Soil Resources (WRB) is soil with strong mottling of the soil profile due to redox processes caused by stagnating surface water. Stagnosols are periodically wet and mottled in the topsoil and subsoil, ...
s.


Suborders

* Aquepts – with a water table close to the surface * Gelepts – in very cold climates * Cryepts – in cold climates * Udepts – in humid climates * Ustepts – in semiarid and sub-humid climates' * Xerepts – in areas with very dry summers and moist winters


References

* * * {{Authority control United States Department of Agriculture Pedology Types of soil