- 行业: Earth science
- Number of terms: 26251
- Number of blossaries: 0
- Company Profile:
An international scientific society that fosters the transfer of knowledge and practices to sustain global soils. Based in Madison, WI, and founded in 1936, SSSA is the professional home for 6,000+ members dedicated to advancing the field of soil science. It provides information about soils in ...
A soil consisting predominantly of, and having its properties determined predominantly by, mineral matter. Usually contains <200 g kg-1organic carbon (< 120-180 g kg-1 if saturated with water), but may contain an organic surface layer up to 30 cm thick.
Industry:Earth science
A continuous, indurated calcic horizon that is cemented by calcium carbonate and, in some places, with magnesium carbonate. It cannot be penetrated with a spade or auger when dry, dry fragments do not slake in water, and it is impenetrable to roots.
Industry:Earth science
(i) A transparent sheet giving information to supplement that shown on maps. When the overlay is laid over the map on which it is based, its details will supplement the map. (ii) A tracing of selected details on a photograph, mosaic, or map to present the interpreted features and the pertinent detail, or to facilitate plotting.
Industry:Earth science
A soil that possesses properties and distinguishing characteristics of two or more separate soils.
Industry:Earth science
A land surface shaped by the action of erosion, especially by running water.
Industry:Earth science
(i) Texture group consisting of coarse sandy loam, sandy loam, fine sandy loam, very fine sandy loam, loam, silt loam, silt, clay loam, sandy clay loam, and silty clay loam soil textures. (ii) Family particle-size class for soils with textures finer than very fine sandy loam but <35% clay and <35% rock fragments in upper subsoil horizons.
Industry:Earth science
A planned sequence of crops growing in a regularly recurring succession on the same area of land, as contrasted to continuous culture of one crop or growing a variable sequence of crops.
Industry:Earth science
A calculated value of the approximate wilting point or permanent wilting percentage. Calculated as follows:
Wilting coefficient = Hygroscopic coefficient/0. 68
or
Wilting coefficient = Moisture equivalent/1. 84
Industry:Earth science
A low, smooth, elongated oval hill, mound, or ridge of compact till that may or may not have a core of bedrock or stratified drift. The longer axis is parallel to the general direction of glacier flow. Drumlins are products of streamline (laminar) flow of glaciers, which molded the subglacial floor through a combination of erosion and deposition.
Industry:Earth science
(i) The unconsolidated mineral or organic material on the immediate surface of the earth that serves as a natural medium for the growth of land plants. (ii) The unconsolidated mineral or organic matter on the surface of the earth that has been subjected to and shows effects of genetic and environmental factors of: climate (including water and temperature effects), and macro- and microorganisms, conditioned by relief, acting on parent material over a period of time. A product-soil differs from the material from which it is derived in many physical, chemical, biological, and morphological properties and characteristics.
Industry:Earth science
