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Class, Category, Individual, Population
Individual < Population (all individuals) < Class (similar individuals) < Category (similar classes)
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Soil delineation
- area enclosed by a line (soil boundry)
- Approximates a poly pedon
- contines inclusions (up to an acre)
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Approximate number
Order:
Suborder:
Great Group:
Subgroup:
Family:
Series:
- 12 Alfisol
- 64 Aqualf
- >300 Fragiaqualf
- >2,400 Aeric Fragriaqualf
- ~7,000 fine-silty mixed, active, mesic Aeric Fragiaqualf
- >19,000
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Aquic
- Moisture regimes
- saturated several weeks each year
- gray colors
- receives run-on
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Perudic
- Moisture Regimes
- very humid climated
- very moist year round
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Udic
- Mositure Regimes
- humid climate
- surplus of water (little to now surplus)
- Don't need irrigation for Corn
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Ustic
- Semi-arid climate
- need irrigation for Corn
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Aridic
- Desert climate
- need to irrigate to grow anything
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Xeric
- Mediterranean- wet winter, dry summer
- good for grapes
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Episaturation
Endosaturation
Anthric saturation
Oxyaquic
- perched water table (dense till)
- wet throughout
- perched water table (man)
- wet but no reduction on till bevels
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Fine-silty, mixed, active, mesic
- family particle size
- mineralogy
- clay activity (CEC/g clay)
- temperature
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Cratonic Rocks
- Igneous and metamorphic
- exposed in Canada
- 3,500-20,000 deep in IN
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Interior Platform
- Mid-west
- covered with deposits 650-290 mil yrs ago
- mostly limesotnes, sandstones, and shales
- sediments were originally level
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Sedimentary rocks in IN
- Oldest Ordovician age (44-488 mil yrs ago)
- Youngest Pennsylvanian Age (299-318 mil yrs ago)
- Before dinosaur fossils
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Why classify soils (3)
- Organize knowledge
- Understanding relationships
- remember properties
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Individual
A polypedon or pedon
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Guide line for Soil Taxonomy
- – Natural classification
- – Comprehensive
- – Based on soil properties
- - Prefer subsurface properties
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Umbric
like a mollic but below 50% B.S.
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Quilifications for Mollic epipedon
- Good structure
- 3/3 or darker
- at least 25 cm
- higher than 50% B.S.
- Does not fit other properties
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