- 行业: Earth science
- Number of terms: 26251
- Number of blossaries: 0
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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 ...
Land so located that production of cultivated crops is economical and practical.
Industry:Earth science
An organism whose optimum temperature for growth is above 45°C.
Industry:Earth science
Please see the specific soil water terms listed below and Table 5:
* soil water potential, (pressure, head) - The amount of work that must be done per unit of a specified quantity of pure water in order to transport reversibly and isothermally an infinitesimal quantity of water from a specified source to a specified destination. If the specified quantity is volume, the potential is referred to as pressure (Pa). If the specified quantity is weight, the potential is referred to as head (m). If the specified quantity is mass, the potential is the term used (J kg-1).
* hydraulic head, pressure, potential - The sum of gravitational, hydrostatic, and matric water potential, expressed as head, pressure, or potential.
* differential water capacity - The absolute value of the rate of change of water content with soil water pressure. The water capacity at a given water content will depend on the particular desorption or adsorption curve employed. Distinction should be made between volumetric and specific water capacity.
* water content - The water lost from the soil upon drying to constant mass at 105 °C; expressed either as the mass of water per unit mass of dry soil or as the volume of water per unit bulk volume of soil.
Industry:Earth science
Material ranging from fine clay to sand derived from glaciers and deposited in glacial lakes by water originating mainly from the melting of glacial ice. Many are bedded or laminated with varves.
Industry:Earth science
A trioctahedral smectite containing magnesium with the majority of the charge originating in the tetrahedral layers.
Industry:Earth science
A utilitarian grouping of soils defined by soil or environmental features that are not class differentia used in U. S. system of soil taxonomy, e.g., surface texture, surficial rock fragments, rock outcrops, substratum, special soil water conditions, salinity, physiographic position, erosion, thickness, etc. Phase identifications are introduced into soil names by adding them to a taxon name as modifiers.
Industry:Earth science
Movement of ions and water into the plant root because of metabolic processes by the root, frequently against an electrochemical potential gradient.
Industry:Earth science
Any material such as lime, gypsum, sawdust, compost, animal manures, crop residue or synthetic soil conditioners that is worked into the soil or applied on the surface to enhance plant growth. Amendments may contain important fertilizer elements but the term commonly refers to added materials other than those used primarily as fertilizers.
Industry:Earth science
In ecological theory, that group of microorganisms in soil living at or near the carrying capacity of the soil environment. Analogous to autochthonous microorganisms.
Industry:Earth science
