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Labile-
A substrance that is easily degraded or transformed by microorganisms or readily available fro plant uptake.
Land-
A general term for the environment of the earth not covered completely by water. In addition to soils includes minerals, waterways, plant cover, etc.
Land Capability Classification-
A grouping of kinds of soils in classes and units which describe their capability for intensive agricultural use and the treatments required for sustained use.
Layer Silicate-
A member of the phyllosilicate group of minerals which dominate the clay fraction of soils e.g. biotite, montmorillonite, kaolinite.
Leaching-
The action of percolating waters carrying away materials in solution or suspension.
Lecithin-
An emulsifier, or mixing agent, that helps fat and water
stay together. Lecithin is present in egg yolks and milk; it
aids mixing in mayonnaise and ice cream.
Legume-
Any plant type within the family Leguminosae, such as pea, bean,
alfalfa, and clover. Has a symbiotic relationship with the Rhizobia bacteria which form root nodules and fix atmospheric nitrogen. The nitrogen is used by the plant in exchange for photosynthate carbon which is used by the bacteria.
Lesion-
A wound or diseaesed area.
Limestone-
A sedimentary rock composed mainly of calcite CaCO3.
Loam-
A soil textural class of medium texture having moderate amounts of sand (23-52%), silt (28-50%) and clay (7-27%).
Loess-
A wind blown deposit or parent material. Mainly silt. Often formed by wind action on dried-up glacial lake beds.
Lignin-
The complex woody fibres of plant tissue that resist decomposition.
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