12 Soils the Foundation.pdf.edu

12 Soils the Foundation.pdf.edu - Soils: The Foundation...

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1 Soils: The Foundation Soil Profiles and horizons Soil Profile: A vertical cross-section of the soil, exposing the various horizons. Soil Horizon: A layer of soil, approximately parallel to the soil surface, differing in properties and characteristics from adjacent layers below and above it. A C C B E B A A Soil horizon designations: A - Surface mineral horizon Dark color due to organic matter. O - Organic horizon Made up of decaying plant residues. E - Horizon of eluviation Highly leached, has a light color. B - Horizon of accumulation Clay, iron, and aluminum oxides. C- Parent material Soil texture The proportionate quantity of sand, silt, and clay in the mineral fraction of a soil.
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2 Soil separate Particle diameter _________________________________ (mm) Sand . . . . . . . . . . 2.0 - 0.05 Silt . . . . . . . . . . 0.05 - 0.002 Clay . . . . . . . . . . <0.002 _________________________________ Soil Texture Effects of soil texture on the soil environment 1. Movement and retention of water
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This document was uploaded on 11/04/2011 for the course PWS 150 at BYU.

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12 Soils the Foundation.pdf.edu - Soils: The Foundation...

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