RelativeResourceManager(2) - Stability of peds depends on...

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NRES 201 Intro to Soil Science Lec. 3-4. Soil Physical Properties Ch. 4 1/10/2011 2 Soil structure refers to how the individual sand, silt, and clay particles are arranged into stable aggregates. - can be affected by management Structural units are know as aggregates or peds. Soil structure results when soil particles are pushed together by: - freezing-thawing important in temperate climates - wetting-drying important in humid climates - tillage operations mixing organic material into soil SOIL STRUCTURE
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Unformatted text preview: Stability of peds depends on cementing agents that bind the sand, silt, and clay particles together:- soil organic matter (humus) chemical bonds, sticky polysaccharides- secondary carbonate and iron oxides chemical bonds- water films - tension- clay - flocculation, cationic bridges SOIL STRUCTURE Clods vs Peds- clods are produced by improper tillage wet soils, heavy equipment- peds are produced by soil forming processes more gentle and loving, happier soils SOIL STRUCTURE...
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