Alfisols are a soil order in USDA soil taxonomy. Alfisols form in semi-arid to humid areas, typically under a hardwood forest cover. They have a clay-enriched subsoil and relatively high native fertility. "Alf" refers to aluminium (Al) and iron (Fe).

The central concept of Alfisols is that of soils that have an argillic, a kandic, or a natric horizon and a base saturation of 35% or greater. They typically have an ochric epipedon, but may have an umbric epipedon. They may also have a petrocalcic horizon, a fragipan or a duripan.

Alfisol, one of the 12 soil orders in the U.S. Soil Taxonomy. Alfisols are arable soils with water content adequate for at least three consecutive months of the growing season. Prior to cultivation they are covered with natural broad-leaved deciduous forest …

Alfisols are moderately leached soils that have relatively high native fertility. These soils have mainly formed under forest and have a subsurface horizon in which clays have accumulated. Alfisols are primarily found in temperate humid and subhumid regions of the world.

Alfisols are forest soils that have relatively high native fertility. Alfisols typically exhibit well-developed, contrasting soil horizons (layers) depleted in calcium carbonate but enriched in aluminum- and iron-bearing minerals. Below the surface horizon lies a region with significant accumulation of translocated (migrated) layer silicate clay.

Alfisols primarily are fertile soils of the forest, formed in loamy or clayey material. The surface layer of soil, usually light gray or brown, has less clay than the subsoil. These soils are usually moist during the summer but may dry during occasional droughts.

Alfisols are moderately leached soils that have relatively high native fertility. These soils have formed primarily under forest and have a subsurface horizon in which clays have accumulated. Alfisols are found mostly in temperate humid and subhumid regions of the world.

Key Characteristics: Alfisols. Found under forest and savanna vegetation; Clay accumulations in subsoil horizons; Often are leached below topsoil (E horizon) Generally fertile, with high base saturation%. Comparable in productivity to Mollisols and Ultisols. Extensive in humid mid-latitudes; Extent of world ice-free land area: 10%

Alfisols are forest soils that have relatively high native fertility. These soils are well developed and contain a subsurface horizon in which clays have accumulated. Alfisols are mostly found in temperate humid and sub-humid regions of the world.

Alfisols are forest soils that have relatively high native fertility. These soils are well developed and contain a subsurface horizon in which clays have accumulated. Alfisols are mostly found in temperate humid and subhumid regions of the world.