- 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 nonsaline soil containing sufficient exchangeable sodium to adversely affect crop production and soil structure under most conditions of soil and plant type. The sodium adsorption ratio of the saturation extract is at least 13.
Industry:Earth science
(i) Unconnected voids with smooth walls. (ii) Spherical structures, formed intracellularly, by vesicular arbuscular endomycorrhizal fungi.
Industry:Earth science
Potential energy of soil water due to the weight of water (hydrostatic pressure) on the point of interest. Pressure head is expressed as energy per weight and is equal to the height of water between the point of interest and the free water surface (water table), hp, also termed the piezometric head. Pressure potential is expressed as energy per unit volume and equals the piezometric head, Hp, the water density, ρ, and the gravitations constange, g (ρghp.
Industry:Earth science
Models based upon the consept that the variable of interst is represented by variablility or uncertainty in the input values and the output represents probability distributions functions.
Industry:Earth science
A term used by some as synonymous with "Chernozem;" by others (in Australia) to describe self-mulching black clays.
Industry:Earth science
Silicate type minerals in which no oxygens are shared between silica tetrahedra; silicon-oxygen ration is SiO44-; example mineral: olivine, (Mg, Fe)2SiO4.
Industry:Earth science
Soil developed under conditions of poor drainage resulting in reduction of iron and other elements and in gray colors and mottles.
Industry:Earth science
Soil that has been dried at 105°C until it reaches constant mass.
Industry:Earth science
Conversion of molecular nitrogen (N2) to ammonia and subsequently to organic nitrogen utilizable in biological processes.
Industry:Earth science
