- 업종: 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 ...
Charge sites on the surface of soil particles that can be readily replaces with a salt solution. In most soils, Ca2+, Mg2+, K+ and Na+ predominate. Historically, these are called bases because they are cations of strong bases. Many soil chemists object to this term because these cations are not bases by any modern definition of the term.
Industry:Earth science
Non or slightly vesicular pyroclastics, 2. 0 to 76 mm in at least one dimension, with an apparent specific gravity of 2. 0 or more.
Industry:Earth science
Mineral soils that have a spodic horizon or a placic horizon that overlies a fragipan. (An order in the U. S. system of soil taxonomy. )
Industry:Earth science
Cellular organisms having a membrane-bound nucleus within which the genome of the cell is stored as chromosomes composed of DNA; includes algae, fungi, protozoa, plants, and animals.
Industry:Earth science
An organic soil in which the plant residues are recognizable. The sum of the thicknesses of the organic layers are usually greater than the sum of the thicknesses of the mineral layers.
Industry:Earth science
Entisols that contains recognizable fragments of pedogenic horizons that have been mixed by mechanical disturbance. Arents are not saturated with water for periods long enough to limit their use for most crops.
Industry:Earth science
Phenomenon that occurs when small pores which reduce the water potential are in contact with free water.
Industry:Earth science
Semicircular, concave, bowl-like area with steep face primarily resulting from erosive activity of a mountain glacier.
Industry:Earth science
Potential envergy of soil water due to the attractive forces (adhesion and cohesion) between water and the soil matrix. Matric potential is expressed as energy per unit volume and equals the product of the height of rise in a capillary tube, hm, the water density, ρ, and the gravitational constant, g, (ρghm). Matric head is expressed as energy per weight and is equal to the height of rise ina capillary tube (hm).
Industry:Earth science
In Soil Survey a map unit that is a type of miscellaneous area, which is composed of loose cinders and other pyroclastic materials.
Industry:Earth science
