1. Introduction 2. What is Soil 3. Functions of Soils 4. Composition of Soils 5. Soil Formation.
[PPT]Slide 1 - Home | Soil Science Society of America · Web viewAround the World of Soils Soil...
Transcript of [PPT]Slide 1 - Home | Soil Science Society of America · Web viewAround the World of Soils Soil...
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Around the World of Soils
Soil Types
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12 Soil Orders
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Soil Orders in US
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World View
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ALFISOLModerately Weathered
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ANDISOLVolcanic ash
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ARIDISOLVery Dry
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ENTISOLNewly Formed
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GelisolFrozen
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HISTOSOLOrganic, Wet
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INCEPTISOLSlightly Developed (young)
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MOLLISOLDeep, Fertile
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OXISOLVery Weathered
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SPODOSOLSandy, Acidic
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ULTISOLWeathered
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VERTISOLShrinks and Swells
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Where are the Orders found?• Alfisols - temperate forests - generally east of the Mississippi • Andisols - soils formed in volcanic ash – Pacific Northwest• Aridisols – desert soils – desert southwest• Entisols - soils with little or no morphological (horizon) development – Beaches, sand
dunes, and floodplains• Gelisols - soils with permafrost – tundra, Alaska• Histosols - organic soils – very wet area, parts of FL, MN, AK, MI, ME, NC• Inceptisols - weakly developed soils – almost anywhere• Mollisols - grassland soils – the Great Plains• Spodosols – acidic, sandy forest soils under conifers – Sandy areas of the North east
to Minnesota, sandy areas of the Atlantic coastal plain • Oxisols - very weathered soils of tropical and subtropical environments – Puerto Rico
and Hawaii• Ultisols – acidic, strongly leached, older soils – common in the SE US • Vertisols - clayey soils that swell when wet – parts of Texas west to the desert
southwest and east through Alabama, Mississippi Delta Region, northern Great Plains and parts of California
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Vocabulary• Alfisols - moderately leached soils often found in temperate forests• Andisols - soils formed in volcanic ash • Aridisols – desert soils • Entisols - soils with little or no morphological (horizon) development• Gelisols - soils with permafrost • Histosols - organic soils • Inceptisols - weakly developed soils • Mollisols - grassland soils • Spodosols – acidic, sandy forest soils under conifers• Oxisols - very weathered soils of tropical and subtropical environments • Ultisols – acidic, strongly leached, older soils • Vertisols - clayey soils that swell when wet