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

Ustults

Earth science; Soil science

Ultisols that have low or moderate amounts of organic carbon, are brownish or reddish throughout, and have an ustic soil moisture regime.

Cone index

Earth science; Soil science

The force per unit basal area required to push a cone penetrometer through a specified increment of soil.

Plasticity number

Earth science; Soil science

The numerical difference between the liquid and the plastic limit or, synonymously, between the lower plastic limit and the upper plastic limit.

Infiltration flux

Earth science; Soil science

The volume of water entering a specified cross-sectional area of soil per unit time.

Slump block

Earth science; Soil science

The mass of material torn away as a coherent unit during slumping.

Salt balance

Earth science; Soil science

The quantity of soluble salt removed from an irrigated area in the drainage water minus that delivered in the irrigation water.

Nonpressure solution

Earth science; Soil science

Usually nitrogen fertiliser solutions of such low free NH3 content that no vapour pressure develops and application can be made without need for controlling vapour pressure.