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

Batch culture

Earth science; Soil science

A method for culturing organisms in which the organism and supporting nutritive medium are added to a closed system. Contrast with chemostat.

Hue

Earth science; Soil science

A measure of the chromatic composition of light that reaches the eye; one of the three variables of color.

Permafrost

Earth science; Soil science

(i) Permanently frozen material underlying the solum. (ii) A perennially frozen soil horizon.

Solonetz

Earth science; Soil science

A great soil group of the intrazonal order and halomorphic suborder, consisting of soils with a very thin, friable, surface soil underlain by a dark, hard columnar layer usually highly alkaline; ...

Red-yellow podzolic soils

Earth science; Soil science

A combination of the zonal great soil groups, Red Podzolic and Yellow Podzolic, consisting of soils formed under warm-temperate to tropical, humid climates, under deciduous or coniferous forest ...

Lysimeter

Earth science; Soil science

(i) A device for measuring percolation and leaching losses from soil under controlled conditions. (ii) A device for measuring gains (irrigation, precipitation, and condensation) and losses ...

Chemostat

Earth science; Soil science

A device for the continuous culture of microorganisms in which growth rate and population size are regulated by the concentration of a limiting nutrient in incoming medium.