Lecture 7 Structure, Density and Porosity

Lecture 7 Structure, Density and Porosity - 1 Soil...

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Unformatted text preview: 1 Soil Structure, Density, Porosity Sedimentation Sedimentation 1 minute Sand settles out 2 hours Silt settles out sand 1 min. silt 1 hr. suspension The density of a soil suspension decreases as particles settle out. Soil Physical Properties Soil Physical Properties Color Color Texture Texture Structure Structure Density Density 2 Soil Structure Soil Structure Arrangement or grouping of individual soil particles into secondary units. Soil Structure Soil Structure Peds Aggregates Units of soil Structure Porosity - Water, Heat, aeration, soil density Management (e.g. tillage, O.M) Physio-chemical Processes (inorganic) Biological Activities (organic)-macro-organisms (burrowing, tunneling,wastes)-roots (compression, fibers, exudates)-microorganisms (carbon, acids, exudates) Formation Soil Structure Soil Structure- Iron and clays 3 Soil Structure Soil Structure Classification grade class type Strong Moderate weak Spheroidal Platy Block-like Prism-like Fine Medium Coarse V. coarse strength Size...
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Lecture 7 Structure, Density and Porosity - 1 Soil...

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