UIUC NRES 201 - Soil Formation III (2 pages)
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Soil Formation III
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- Lecture number:
- 8
- Pages:
- 2
- Type:
- Lecture Note
- School:
- University of Illinois at Urbana, Champaign
- Course:
- Nres 201 - Introductory Soils
- Edition:
- 1
Documents in this Packet
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36 pages
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Lecture 41: Practical Nutrient Management III
2 pages
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Lecture 40: Practical Nutrient Management II
2 pages
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Lecture 39: Practical Nutrient Management I
3 pages
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3 pages
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3 pages
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3 pages
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Lecture 35: Biotic Cycling of Nitrogen and Sulfur III
3 pages
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Lecture 34: Biotic Cycling of Nitrogen and Sulfur II
4 pages
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Lecture 33: Biotic Cycling of Nitrogen and Sulfur I
3 pages
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Lecture 32: Soil Organisms and Ecology
3 pages
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2 pages
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Lecture 31: Soil Organisms and Ecology II
3 pages
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Lecture 30: Soil Organisms and Ecology I
2 pages
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Lecture 29: Soil Acidity, Alkalinity and Salinity
3 pages
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Lecture 28: Soil Acidity and Alkalinity II
2 pages
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Lecture 27: Soil Acidity and Alkalinity I
2 pages
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12 pages
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Lecture 26: Colloidal Properties II
2 pages
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Lecture 24: Colloidal Properties I
2 pages
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Lecture 23: Soil Aeration and Temperature II
2 pages
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Lecture 22: Soil Aeration and Temperature I
3 pages
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3 pages
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Lecture 20: Soil Management and Erosion
3 pages
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Lecture 19: The Hydrologic Cycle
3 pages
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Lecture 18: Hydrological Cycle II
3 pages
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Lecture 17: Hydrological Cycle I
3 pages
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3 pages
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2 pages
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Lecture 14: Soil Organic Matter
2 pages
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6 pages
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Lecture 13: Soil Physical Properties
2 pages
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2 pages
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Lecture 11: Soil Survey and Land Use II
3 pages
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Lecture 10: Soil survey and Land Use I
2 pages
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Lecture 9: Soil Classification
3 pages
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3 pages
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2 pages
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2 pages
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Lecture 4: Nature of Soil Genesis
3 pages
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Lecture 3: Soil and Soil Properties II
3 pages
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Lecture 2: Soil and Soil Properties I
3 pages
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2 pages
Unformatted text preview:
NRES 201 Lecture 8 Outline of Last Lecture I The soil in profile II Soil horizons Outline of Current Lecture III Rationale for classification IV Soil taxonomy Current Lecture Rationale for classification Soil heterogeneity The five soil forming factors interact to produce nearly endless variety in soils Soil formation never stops so the variety expands over time Soils as individuals Soils characterize as pedons the smallest 3 dimensional unit that has all the properties of a particular soil A polypedon is a group of similar pedons and constitutes a soil individual A soil series consists of all soil individuals whose properties fall within a certain range Reasons for soil classification To organize knowledge of soils to better understand relationships among soils to provide information pertinent to similar soils elsewhere in the world Soil taxonomy Bases of classification The surface part of the pedon epipedon organic matter texture color structure cation composition The subsurface part of the pedon drainage color accumulation of clay Fe Al Climate moisture and temperature regimes Diagnostic surface horizons Mollic epipedon o Formed under grass o Dark colored thick o High organic matter o High in basic cations Umbric epipedon o Like a mollic epipedon but more acidic These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Forms in areas with higher rainfall Ochric epipedon o Mineral horizon that does not qualify as a mollic or umbric epipedon Melanic epipedon o Not found in Illinois can be found in Philippines etc o Developed from volcanic ash o Light in weight and fluffy Histic epipedon o Formed in wet areas o Thick organic horizon overlying a mineral soil Diagnostic subsurface horizons Albic Horizon o Light colored eluvial horizon depleted of clay o Low in fertility Argillic Horizon o Illuvial horizon with clay accumulation o Clay accumulates on ped surfaces between
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NRES 201: Epipedons and Soil Orders
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