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Justus von Liebig (1803 -1873)

Briefly explain the “law of the minimum”. Law of the Minimum. Justus von Liebig (1803 -1873). What is a soil pedon ?. Brady and Weil, 2002. Briefly explain any 2 of the soil body metaphors that we discussed in class. 12 textural classes. Textural triangle.

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Justus von Liebig (1803 -1873)

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  1. Briefly explain the “law of the minimum”. Law of the Minimum Justus von Liebig (1803 -1873)

  2. What is a soil pedon ? Brady and Weil, 2002

  3. Briefly explain any 2 of the soil body metaphors that we discussed in class

  4. 12 textural classes Textural triangle How much sand, silt and clay is represented by this location ? http://www.oneplan.org/Images/soilMst/SoilTriangle.gif

  5. Why do the textural class zones on the textural triangle have such strange sizes and shapes ?

  6. 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

  7. Why did Dr. Jenny think the Mendocino staircase was such as interesting place? Hans Jenny (1899 - 1992) Mendocino Staircase

  8. a) Identify 4 soil functions. b) Which soil function is of greatest interest to you ? Explain.

  9. Bedrock geology is very important to well drillers in IL but is not very important to soil scientists. Briefly explain.

  10. Briefly explain why the landscape position identified by the oval is poorly drained (without artificial drainage). Poorly drained Interstream divide Somewhat poorly drained Moderately well drained LANDSCAPE POSITIONS Well drained Poorly drained Shoulder Common in IL Valley floor SOIL DRAINAGE CLASSES Backslope N.C. Agric. Res. Bull. 467

  11. Young Soil in NC Old Soil in NC Describe 2 differences (other than color) that are generally expected between “mature” and “immature” soils. http://www.mo15.nrcs.usda.gov/features/gallery/

  12. b) Provide a specific example for 2 of the processes a) Identify 3 of the 4 types of soil forming processes illustrated on this diagram Adapted from Stewart (1990)

  13. Typical Florida flatwoods Spodosol b) What is the name of the water driven process from which this pale colored and weak structured horizon derives its name ? a) What is the name of this horizon ? http://www.fnps.org/photos/spodosol.jpg

  14. Identify 3 soil properties that are commonly used to differentiate soil horizons C…. T…… D…… S…….. C………. O…… …… ……. A…… M…… …………. B……… ……..

  15. o O Briefly explain why many soils in IL do not have all 5 of the master horizons.

  16. Should we maintain long term experiments ? Explain your answer.

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