Quiz notes from last week
Quiz notes from last week PSS 3303
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This 3 page Class Notes was uploaded by Payton Gilmore on Sunday September 18, 2016. The Class Notes belongs to PSS 3303 at Mississippi State University taught by Dr. Jac J. Varco in Fall 2016. Since its upload, it has received 8 views. For similar materials see Soils in plant and soil sciences at Mississippi State University.
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Date Created: 09/18/16
Soils Quiz 3 Definitions: Eluviation- ( Latin ex-out, luv. –washed) removal of soil material in suspension out of a zone of soil Illuviation- (il-in) movement of soil material or deposition of it into a zone of soil (horizon). Usually upper horizon material deposited into a deeper horizons. Translocated materials include: organic matter, aluminosilacate clays, Al and Fe-oxides, carbonates, and gypsum. Depth depends on effective depth of leaching (rainfall), chemical properties, and physical properties such as an impermeable layer or water table. Summary: a. Additions- water, heat, organic matter, nitrogen, plant and animal residues, sediments, salts, fertilizers b. MISSING NOTE Designating/Delineating Horizons IMAGE Soil Horizon Designation/Definitions: 1. O-organic horizon-leaves, needles, humus, peat o Fibric i- slightly decoposed o Hemic e- intermediately decomposed o Sapric a- highly decomposed Forest Soil Terminology Mull-organic matter mixed with mineral matter Mor- mainly humus Duff mull- In between mull and mor Soil Horizon Designation/Definitions: A- Mineral horizon formed at the soil surface or below an O, mineral matter intimately mixed with organic matter P- plowed or other disturbance. E- Mineral horizon light in color, highly eluviated, accumulation of sand and silt and resistant minerals; occur in areas of high rainfall B- Mineral horizon formed below an A, E, or O horizon. Characterized as an illuvation horizon, accumulation of clay, silica, Fe and Al-oxides etc. Subordinate distinctions: o K- accumulation of carbonates o G- gleying, grays to blues, reducing condition especially Fe. o H- illuvial humus (only occur in forest) o S- illuvial iron oxides (occur mostly only in forest) o M- cementation into hardpan, iron, lime, gypsum, silica o T- illuvial clay (seen most often) x- fragipan hard when dry, brittle when moist, loamy texture v- plinthite subsoil enriched with Fe, hard or brick like upon drying, red mottling c- concretions or nodules w- development of color or structure ss- slickensides o-oxic 2 o C-Horizon which is little affected by pedogenic processes, lacks horizon properties. o Unconsolidated rock from residuum, colluvium, glacial till, etc. Can be parent material, but not always. o R- Hard bedrock- sufficiently hard that it can not be dug with a spade o Transitional horizon-has properties of two horizons o AE,AB,EB,BE, etc. IMAGE 3
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