T2+Slides

T2+Slides - Organic matter Organic Matter Mojave Desert...

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1 Topic #2 Goals Understanding what soil color can tell you about a soil What is soil texture? How do you determine soil textural classes Why is soil texture important What is soil structure and why is it important? Soil Color Drainage condition (oxygen present/absent) Organic matter content Degree of weathering Red Yellow-Red Yellow HUE High Value = White Low Value = Black High Chroma = Strong Low Chroma = Weak Parent Material = Grayish
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2 Major Coloring Agents in Soils Iron: red, yellow, blue/green Organic matter: black, brown Sulfides: black Coloration Due to Iron Fe 3+ Fe 2+ e - + Blue/Green Red/Yellow Oxygen present Oxygen absent e - + O 2 = H 2 O Mobile Immobile Fe 2+ leaching results in gray soil Iron oxides Fe 3+ Well drained Oxygen present Iron oxides Fe 3+ Well drained Oxygen present Fe 2+ Poorly drained No oxygen Iron minerals ? ? Fe 3+ Fe 2+ ? Sulfides Rooting zone Owens Dry Lake Groundwater
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3 Black
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Unformatted text preview: Organic matter Organic Matter Mojave Desert Lime Calcium carbonate ? Salt Owens Dry Lake Bed Arctic Alaska ? Permafrost ? ? 4 O (organic matter) B (iron oxides) E (no coatings) A C Well Drained or Poorly Drained? Iron has been leached away Redoximorphic Features Vernal Pool Wetlands +O 2 +O 2-O 2-O 2-O 2 +O 2 Poorly drained agricultural fields 5 Soil Texture Sand = 50% Silt = 20% Clay = 30% Importance of Soil Texture to Various Soil Properties Gardening Soil Quality Soil Structure Binding Agents Organic matter Root and microbial secretions Iron & aluminum oxides Clays Calcium Destruction of structure Sodium Tillage crushing & compaction Loss of organic matter 6 Crumb - porous Subangular blocky Columnar Prismatic Prismatic Like beach sand Effect of Structure on Water/Gas Movement...
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This note was uploaded on 01/27/2011 for the course SSO 10 taught by Professor Randydahlgren during the Fall '10 term at UC Davis.

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T2+Slides - Organic matter Organic Matter Mojave Desert...

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