justus von liebig (1803 -1873) law of the minimum briefly explain the “law of the minimum”
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Justus von Liebig (1803 -1873)
Law of the
Minimum
Briefly explain the “law of the minimum”.
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What is a soil pedon ?
Brady and Weil, 2002
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Briefly explain any 2 of the soil body metaphors that we discussed in class
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Textural triangle
12 textural classes
http://www.oneplan.org/Images/soilMst/SoilTriangle.gif
How much sand, silt and clay is represented by this location ?
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Why do the textural class zones on the textural triangle have such strange sizes and shapes ?
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Soil = f (Cl, O, R, P, T…)
H Jenny refined the ideas of Russian scientist VV Dokuchaev into the following equation:
Identify the 5 factors of soil formation
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Hans Jenny(1899 - 1992)
Mendocino Staircase
Why did Dr. Jenny think the Mendocino staircase was such as interesting
place?
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a) Identify 4 soil functions.
b) Which soil function is of greatest interest to you ? Explain.
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Bedrock geology is very important to well drillers in IL but is not very important to soil scientists. Briefly explain.
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Interstream divide
SOIL DRAINAGE CLASSES
Poorly drained
Somewhat poorly drained
Moderately well drained
Poorly drained
Well drained
Valley floorBackslope
Shoulder
LANDSCAPE POSITIONS
N.C. Agric. Res. Bull. 467
Common in IL
Briefly explain why the landscape position identified by the oval is poorly
drained (without artificial drainage).
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Young Soil in NC
Old Soilin NC
http://www.mo15.nrcs.usda.gov/features/gallery/
Describe 2 differences (other than color) that are generally expected between
“mature” and “immature” soils.
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a) Identify 3 of the 4 types of soil forming processes illustrated on this diagram
Adapted from Stewart (1990)
b) Provide a specific example for 2 of the processes
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http://www.fnps.org/photos/spodosol.jpg
Typical Florida flatwoods Spodosol
a) What is the name of this horizon ?b) What is the name of the water driven process from which this pale colored and weak structured horizon derives its name ?
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C…. T…… D……
S……..C……….
O…… …… ……. A……
M…… …………. B……… ……..
C…. T…… D……
S……..C……….
O…… …… ……. A……
M…… …………. B……… ……..
Identify 3 soil properties that are commonly used to differentiate soil horizons
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o O
Briefly explain why many soils in IL do not have all 5 of the master horizons.
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Should we maintain long term experiments ? Explain your answer.