- 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 ...
(Na0. 7Ca0. 3)Mn7O14•2. 8H2O A black manganese oxide that is common in iron-manganese nodules of soils. It has a layer structure.
Industry:Earth science
A particle, which may be a molecular aggregate, with a diameter of 0. 1 to 0. 001 μm. Soil clays and soil organic matter are often called soil colloids because they have particle sizes that are within, or approach colloidal dimensions.
Industry:Earth science
A channel or stream with multiple channels that interweave as a result of repeated bifurcation and convergence of flow around interchannel bars, resembling (in plan view) the strands of a complex braid. Braiding is generally confined to broad, shallow streams of low sinuosity, high bedload, non-cohesive bank material, and a steep gradient.
Industry:Earth science
A part of a population taken to estimate a parameter of the whole population.
Industry:Earth science
A negatively charged ion held on or near the surface of a solid particle by a positive surface charge and which may be easily replaced by other negatively charged ions ( e.g. with a Cl- salt).
Industry:Earth science
(i) The force retarding the flow of a fluid over the surface of a solid body. (ii) See tillage, drag.
Industry:Earth science
A clear, dioctahedral layer silicate of the mica group with Al3+ in the octahedral layer and Si and Al in a ratio of 3:1 in the tetrahedral layer.
Industry:Earth science
A clay mineral of the kaolin subgroup. It has a 1:1 layer structure composed of shared sheets of Si-O tetrahedrons and Al-(O,OH) octahedrons with very little isomorphous substitution.
Industry:Earth science
(i) (irrigation) Rate at which water is applied per unit area; usually in mm per hour, (ii) weight or volume of a fertilizer, soil amendment, or pesticide applied per unit area.
Industry:Earth science
A mineral soil horizon of enrichment with secondary salts more soluble in cold water than gypsum. A salic horizon is 15 cm or more in thickness, contains at least 20 g kg-1salt, and the product of the thickness in centimeters and amount of salt by weight is >600 g kg-1.
Industry:Earth science
