loam


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Related to loam: clay loam, silt loam

loam,

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.

Loam

 

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.

loam

[lōm]
(geology)
Soil mixture of sand, silt, clay, and humus.
(metallurgy)
Molding material consisting of sand, silt, and clay used over backup material for producing massive castings, usually of iron or steel.

loam

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.

loam

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.
References in periodicals archive ?
The confidence regions were triangular-shaped and captured most data points but extended well past the areas of observed data, including sand, loamy sand, sandy loam soil textures, which are not known to support fracturing.
The lowest air-filled porosities were observed in the unamended sand and the 19:1 and 4:1 loam mixtures, which did not meet the lower limit for air-filled porosity (0.
1994), two range sites were identified: a sandy loam range site and a variant of a loamy range site (Table 1).
It was found that the TOC decreased sharply with increasing treatment time for loam, silty loam and silty-clay loam up to two days, then remained relatively constant at the longer treatment time intervals.
The increase in C and N concentrations in the order sandy loam < loam < sandy clay loam < clay loam < silty clay loam (Table 6) was consistent with previous reports of a strong relationship between stabilisation of OC and clay content (Hassink 1997; Kogel-Knabner et al.
The outcomes indicated that use of sulfur and urease (agrotain) coated urea can reduce 50% of the ammonia volatilization losses from sandy loam acidic soils (Junejo, 2009a).
loam, experiments were conducted to study the effect of time of autoclaving on the compressive strength.
The 1:250 000 scale soil map (New Zealand Soil Bureau 1954) of the study area classifies the entire 60-ha project area (2000m by 300 m) as well-drained Kawhatau silt loam (Table 2).
Runoff from the bare clay loam slope contained virtually all the pathogens present in the manure, but runoff from vegetated clay loam slope had only 0.
The furnace either produced ingot sows (for the forging operation and rolling and slitting mill) or was tapped into a ladle to pour castings in buried loam molds.
Compared with bean plants grown drugfree, those planted in sandy loam soil containing an antibiotic were shorter, weighed less, produced smaller yields of beans, fixed less soil nitrogen, and picked up fewer nutrients from their environment.
We addressed the first question in two pinyon habitats: an area composed of cinder soils low in moisture and nutrients, and a nearby sandy loam site higher in nutrients, and a nearby sandy loam site higher in nutrients and moisture (Mopper et al.