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Soil types by clay, silt and sand composition as used by the United States Department of Agriculture. Loam (in geology and soil science) is soil composed mostly of sand (particle size > 63 micrometres (0.0025 in)), silt (particle size > 2 micrometres (7.9 × 10 −5 in)), and a smaller amount of clay (particle size < 2 micrometres (7.9 × 10 −5 in)).
In soil taxonomy, its full description is a "Holdrege silt loam, fine-silty, mixed, mesic, Typic Argiustoll". [1] Holdrege silt loam covers 1.8 million acres of land in south-central Nebraska, under a grass landscape. Good drainage and moisture movement resulted in the downward movement of clay and lime.
A fourth term, loam, is used to describe equal properties of sand, silt, and clay in a soil sample, and lends to the naming of even more classifications, e.g. "clay loam" or "silt loam". Determining soil texture is often aided with the use of a soil texture triangle plot. [5] An example of a soil triangle is found on the right side of the page.
A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural management and engineering applications. The principal characteristics used to differentiate soil families include texture, mineralogy, pH, permeability, structure, consistency, the ...
A typical Natchez soil profile consists of a 3-inch (7.6 cm) top soil of dark grayish brown silt loam and to 8 inches (20 cm), a subsurface of brown silt loam, a yellowish brown and dark yellowish brown silt loam subsoil to 36 inches (91 cm) and a substratum that is yellowish brown, and dark yellowish brown silt loam down to 80 inches (200 cm).
Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension with water. Silt usually has a floury feel when dry, and lacks plasticity when wet. Silt can also be felt by the tongue as granular when placed on the front teeth (even when mixed with clay particles). Silt is a common material, making up 45% of average ...
Port Silt Loam profile. Port Silt Loam is the state soil of Oklahoma. This type of soil is reddish in color due to the weathering of reddish sandstones, siltstones, and shales of the Permian period. It is a medium-textured alluvial soil deposited along flood plains. Port Silt Loam can be found in 33 of the 77 counties in Oklahoma and covers ...