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Related to loamy: Loamy Sand, Loam soil


soil composed of sand, silt, clay, and organic matter in evenly mixed particles of various sizes. More fertile than sandy soils, loam is not stiff and tenacious like clay soils. Its porosity allows high moisture retention and air circulation. The popular confusion of loam with humushumus
, organic matter that has decayed to a relatively stable, amorphous state. It is an important biological constituent of fertile soil. Humus is formed by the decomposing action of soil microorganisms (e.g.
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 is probably due to the superior quality of both soils. According to the preponderance of their ingredients, loams are classified as sandy, clay, or silt loams. Most soils of agricultural importance are some type of loam.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a friable sandy and clayey sedimentary rock containing 10–30 percent (by weight) clay particles smaller than 0.005 mm. In soil science, loam with a higher clay content is called heavy loam, and that with less clay is called light loam. A distinction is made between coarse sandy, fine sandy, and silty loam, depending on the content of (1) sand grains of the corresponding size and (2) silty, or aleurite, particles.

The mineralogical composition of loam is varied: the more sandy loan has a high quartz content, whereas the more clayey type contains clay minerals, such as kaolinite, illite, and montmorillonite. Loam is sometimes rich in organic substances; in arid regions it may be rich in water-soluble salts. The origin of loam is usually continental; the corresponding ocean deposits are called sandy or aleurite clays. Loam is often used as a raw material for the production of brick.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Soil mixture of sand, silt, clay, and humus.
Molding material consisting of sand, silt, and clay used over backup material for producing massive castings, usually of iron or steel.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


In building construction, a mixture composed chiefly of moistened clay, sand, and silt, or some mixture including these ingredients. Once used as a mortar when combined with lime, or used as a plaster with the addition of chopped straw.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


1. rich soil consisting of a mixture of sand, clay, and decaying organic material
2. a paste of clay and sand used for making moulds in a foundry, plastering walls, etc.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Unlike the soils previously described, these soils present a slightly differentiated texture on profile, it can be loamy in Am level and middle-fine in Bt level.
As the clay percentage of the other 2 soils increased, or decreased, beyond those of these 3 soils, the final IR increased (6.4 and 7.9 mm/h) and the amount of runoff decreased significantly (23.4 and 28.6mm) for the loamy sand and clay-E, respectively (Figs 2 and 3).
First, soil under conservation tillage contains a lower soil organic carbon pool in the top 30 cm than in the weed-fallow plowed treatment for the loamy sand soil.
The present study was undertaken to compare rodent populations between a grass-dominated loamy range site and a grass-shrub mosaic in a sandy loam site in a Chihuahuan Desert grassland.
Analysis of variance (SAS Institute 1995) was used to determine significant effects of soil type (RH loamy sand, GL loam and BD clay) and treatment (control, AS, MC, OP, PA, HA) and their interaction on various indices related to aggregate stability (Table 3).
Sub-recent piedmont plain characterized by loamy sands and old piedmont plain characterized by silt loam type soils are subjected to annual and biannual torrent floods.
Two different smectitic soils were collected from the 0.05-0.15 m layer in 2 different locations in Israel: a clay soil (Typic Haploxerert) from the Yezre'el Valley in the north and a loamy sand (Typic Rhodoxeralf) (Soil Survey Staff 1999) from the Coastal Plain in the centre of the country.
Bamboos are very adaptable and will tolerate most soils and pH levels, but they prefer a soil that is loamy, rich in organic matter and moist but free-draining.
This produces an area of rich, loamy soil without any manure content.
Coleus need good drainage so grow them in well-drained, loamy compost with lots of grit.
There are six main soil types: clay, sandy, silty, peaty, chalky and loamy.
They thrive in loamy garden soil in sun or partial shade and don't tolerate dry conditions well.