- 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 ...
Material moved by glaciers and subsequently sorted and deposited by streams flowing from the melting ice. The deposits are stratified and may occur in the form of outwash plains, deltas, kames, eskers, and kame terraces.
Industry:Earth science
Continuous or periodic saturation and reduction. The presence of aquic conditions is indicated by redoximorphic features and can be verified by measurement of saturation and reduction.
Industry:Earth science
A very loose, finely granular, or powdery condition on the soil surface.
Industry:Earth science
Irregular tubular streaks within one layer of material transported from another layer by filling of tunnels made by burrowing animals with material from outside the layer in which they are found.
Industry:Earth science
Any process involving both shearing and compactive forces which destroys natural structure and results in a condition of greatly reduced pore space.
Industry:Earth science
By product from the processing of animals or vegetable substances that contain sufficient plant nutrients to be of value as fertilizers.
Industry:Earth science
Mineral soils that have umbric or ochric epipedons, argillic horizons, and that hold water at <1. 5 MPa tension during at least 90 days when the soil is warm enough for plants to grow outdoors. Alfisols have a mean annual soil temperature of <8°C or a base saturation in the lower part of the argillic horizon of 35% or more when measured at pH 8. 2. (An order in the U. S. system of soil taxonomy. )
Industry:Earth science
A vector (macroscopic) point function that is equal to the decrease in the hydraulic head per unit distance through the soil in the direction of the greatest rate of decrease. In isotropic soils, this will be in the direction of the water flux.
Industry:Earth science
Also known as the Advection-Dispersion Equation (ADE). Partial differential equation describing the total solute flux as the sum of the passive movement of solute by convection and the solute movement by diffusion and dispersion.
Industry:Earth science
Dry matter or harvested portion of crop produced per unit of water consumed.
Industry:Earth science
