- 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 material which measurably improves specific soil physical characteristics or physical processes for a given use or as a plant growth medium. Examples include sawdust, peat, compost, synthetic polymers, and various inert materials.
Industry:Earth science
A dimensionless parameter calculated from the pore water velocity (v), proe diameter (d), fluid density (ρ) and the fluid viscosity (μ): Re = ρvd/μ. Values below 2000 indicate laminar flow and values above 2000 indicate turbulent flow.
Industry:Earth science
A group of soils defined as having a specific range in relative wetness under natural conditions as it pertains to wetness due to a water table under conditions similar to those under which the soil developed.
Industry:Earth science
(i) The rate of change of Gibbs free energy, G, with respect to the number of moles of one component in a mixed chemical system at fixed temperature, pressure and number of moles of other components. (ii) The chemical potential of a component increases with increasing concentration or partial pressure.
Industry:Earth science
A soil horizon that has been formed by the process of eluviation.
Industry:Earth science
(i) A condition of consistency at which the soil barely fails to stick to a foreign object. (ii) Specifically and numerically, the water mass content of a well-mixed kneaded soil that barely fails to adhere to a polished nickel or stainless steel surface when the shearing speed is 50 mm s-1.
Industry:Earth science
A close but relatively casual interaction between two dissimilar organisms or biological systems. The association may be mutually beneficial but is not required to accomplish specific functions.
Industry:Earth science
(i) That portion of the micro flora presumed to subsist on the more resistant soil organic matter and little affected by the addition of fresh organic materials. (ii) Microorganisms indigenous to a given ecosystem; the true inhabitants of an ecosystem; referring to the common microbiota of the body of soil microorganisms that tend to remain constant despite constant fluctuations in the quantity of fermentable organic matter.
Industry:Earth science
