A hard, impervious layer of soil (often clay-rich), or iron-oxide cemented material. In Puget Sound the term is commonly used by drillers and contractors to describe glacial till.
A physically compacted soil layer restricting root growth and water movement through it.
A layer in the soil that cannot be penetrated and which restricts root penetration as well as movement of air and water.
a very dense, unfractured, rocklike soil layer that can occur at various depths below the soil surface. It is impervious to water and plant roots. Ripping can permanently destroy a hardpan.
a subsurface indurated horizon. Red-brown hardpans in Australia are characterised by the presence of a porous matrix, commonly red-brown in colour, cemented by silica (usually hyalite), in a variety of transported or residual host materials.
(3) a hardened soil layer in the lower A horizon or the B horizon caused by cementation of soil particles with organic matter or with materials such as silica or calcium carbonate.
A hardened or cemented soil horizon, or layer. The soil material is sandy, loamy, or clayey and is cemented by iron oxide, silica, calcium carbonate, or other substance.
A layer of extremely dense soil
a very dense soil layer caused by compaction or cementation of soil particles by organic matter, silica, sesquioxides, or calcium carbide, for example.
A clay, rock, or mineral layer beneath the soil that water cannot easily pass through.
crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions
A term that should be avoided by the engineer. Originally, it was applied only to a soil horizon that had become rocklike because of the accumulation of cementing minerals. The name implies a condition rather than a type of soil.
a relatively hard, often clayey layer in soil, produced by cementation of soil particles
a hardened or cemented soil horizon or layer. The soil material may be sandy or clayey and may be cemented by iron oxide, silica, calcium carbonate or other substances.
A compacted lay of soil, usually containing clay, through which it is difficult to drain or dig.
A hardened or cemented soil layer. Hardpans occur naturally or are created artificially.
a cemented or hardened soil horizon. This layer, which may be of any texture, is compacted or organic matter, or other substances.
Describes a soil condition of extreme compaction; compaction in layers.
A hard, impervious, often "clayey" layer of SOIL lying just below the surface. Sometimes synonymous for TILL.
A hardened soil layer in the lower or in the horizon caused by cementation of soil particles with organic matter or with materials such as silica, sesquioxides, or calcium carbonate. The hardness does not change appreciably with changes in moisture content, and pieces of the hard layer do not crumble in water. cf. caliche.
The impervious layer of soil or clay lying beneath the topsoil.
compact, impervious, often clayey subsoil through whihc roots cannot gow. [AHDOS
A horizon cemented with organic matter, silica, sesquioxides, or calcium carbonate. Hardness or rigidity is maintained when wet or dry and samples do not slake in water.
Hard, tight soil; a hard layer that may form just below plow depth on cultivated land.
In soil science, agriculture and gardening, hardpan is a general term for a dense layer of soil, residing usually below the uppermost topsoil layer. There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water. Some hardpans are formed by deposits in the soil that fuse and bind the soil particles.