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Acrisols
A reference soil group in the soil classification scheme used by the FAO. Acrisols are acid soils with an argic B horizon (see argic horizon) having a cation-exchange capacity of less than 24 ...
Albeluvisols
A reference soil group in the soil classification scheme used by the FAO. Albeluvisols have an argic B horizon (see argic horizon) with an irregular upper boundary (a condition sometimes known as ...
Alfisols
A soil order of the US soil classification. Alfisols are young, acid soils, with a clay-rich B horizon, commonly occurring beneath deciduous forests. See brown earth.
Alisols
A reference soil group in the soil classification scheme used by the FAO. Alisols have an argic B horizon (see argic horizon) with a cation-exchange capacity of more than 24 cmolc/kg clay and a base ...
Lixisols
A reference soil group in the soil classification scheme used by the FAO. A Lixosol is any soil that has an argic B soil horizon within 100–200cm of the surface, other than Albeluvisols, Alisols, ...
Luvisols
A reference soil group in the soil classification scheme used by the FAO. Luvisols have an argic B horizon (see argic horizon) with a cation-exchange capacity of more than 24cmolc/kg, with illuvial ...
natric horizon
A mineral soil horizon that is developed in a subsurface position in the profile, that satisfies the definition of an argillic horizon, and that also has a columnar structure and more than 15 per ...
oxisol
In the USDA soil taxonomy, an order of mineral soils, comprising soils with an oxic horizon within 2 m of the soil surface, or with plinthite close to the soil surface, and without a spodic or ...
Ultisols
Mineral soils, an order identified by an argillic B horizon with a base saturation of less than 35 per cent, and red in colour from iron oxide concentration. Ultisols are leached, acid soils, ...
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