Soil Physical Properties ESRM 311 SEFS 507

“Soil Physical Properties” ESRM 311 SEFS 507 How are soils formed??? http://www.geography.hunter.cuny.edu/~tbw/nc c/Notes/chap4.wc/soils/how.soil.i...
Author: Belinda Mosley
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“Soil Physical Properties” ESRM 311 SEFS 507

How are soils formed???

http://www.geography.hunter.cuny.edu/~tbw/nc c/Notes/chap4.wc/soils/how.soil.is.made.jpg

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Weathering’s Physical Influence on Soil Directly • Texture - sand, silt, clay • Structure • Porosity • Consistency • Aeration • Temperature • Moisture Indirectly • Bulk density • Color 3

Soil Physical Properties • Horizons

• Color • Texture • Structure

• Consistence • Bulk Density

Weathering’s Visual Influence on Soil: Soil Layers/Horizons

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Soil Color • Depicts OM – brown or black, • moisture – moist is darker, and • parent material – eg, if Fe: aerobic = red, or anaerobic = gray/blue • salts - lighter, • ?? Affects temperatures Indirectly, if OM, it affects nutrients, moisture, etc???

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Soil Color

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Texture Soil texture refers to the proportion of the soil “separates” that make up the mineral component of soil (fine earth fraction < 2mm). These separates are called sand, silt, and clay. These soil separates have the following size ranges: Sand =