Soil science

Soil science

That science dealing with soils as a natural resource on the surface of the earth including soil formation, classification and mapping; physical, chemical, biological, and fertility properties of soils per se; and these properties in relation to the use and management of soils.

Industry: Earth science

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Soil science

Orthophosphate

Earth science; Soil science

A salt of orthophosphoric acid such as (NH4)2HPO4, CaHPO4, or K2HPO4.

Oi horizon

Earth science; Soil science

A layer of organic material having undergone little or no decomposition (fibric material). On the forest floor this layer consists of freshly fallen leaves, needles, twigs, stems, bark, and fruits. ...

Munsell colour system

Earth science; Soil science

A colour designation system that specifies the relative degrees of the three simple variables of color: hue, value, and chroma. For example: 10YR 6/4 is a colour (of soil) with a hue = 10YR, ...

Calcification

Earth science; Soil science

The process or processes of soil formation in which the surface soil is kept sufficiently supplied with calcium to saturate the soil cation exchange sites, or the process of accumulation of calcium ...

Dispersion

Earth science; Soil science

(i) A term used in relation to solute movement. See also hydrodynamic dispersion. (ii) The breakdown of soil aggregates into individual component particles.

Endomycorrhiza

Earth science; Soil science

A mycorrhizal association with intracellular penetration of the host root cortical cells by the fungus as well as outward extension into the surrounding soil.