- المجال: 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 ...
The migration of adsorbed entities off of the adsorption sites. The inverse of adsorption.
Industry:Earth science
The tendency for water applied to the soil surface at rates exceeding the upper limit of unsaturated hydraulic conductivity, to move into the soil profile mainly via saturated flow through macropores, thereby bypassing micropores and rapidly transporting any solutes to the lower soil profile.
Industry:Earth science
The numerical difference between the highest and lowest refractive index of a mineral. Minerals with birefringence exhibit interference colors in thin section when viewed with crossed-polarized light.
Industry:Earth science
The property of a porous material that expresses the ease with which gases or liquids flow through it. Often symbolized by k = Kn/pg, where K is the Darcy hydraulic conductivity, n is the fluid viscosity, p is the fluid density, and g is the acceleration of gravity. Dimensionally, k is an area (L2).
Industry:Earth science
The metabolic process in which an organic compound serves as both an electron donor and the final electron acceptor.
Industry:Earth science
The number of molecules of CO2 liberated for each molecule of O2 consumed.
Industry:Earth science
The percent composition of a fertilizer as determined in a laboratory and expressed as total N, available phosphoric acid (P2O5) equivalent, and water-soluble potash (K2O) equivalent.
Industry:Earth science
The law describing the movement of ions or molecules by diffusion as caused by a concentration gradient.
Industry:Earth science
The equation expressing the force of viscous resistance on a smooth, rigid sphere moving in a viscous fluid under standard temperature and pressure, namely
F=3πηDV
where F is the force of viscous resistance, π = 3. 1416, η is the fluid viscosity, D is the diameter of the sphere, and V is the velocity of fall (or movement). Applying Stokes' law to gravity sedimentation as used in particle-size analysis of soil by pipette or hydrometer methods, the resulting sedimentation equation is
V=2gr2(d1-d2)/9η
where g is the acceleration of gravity, r is the "equivalent" radius of a particle, d1 is the soil-particle density, and d2 is the fluid density. Stokes' law applied to centrifugation yields still another equation for V.
Industry:Earth science
Virus that infect soil bacteria, often with desctruction or lysis of the host.
Industry:Earth science
