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DEMONSTRATIONS IN SOIL SCIENCE Prepared by teachers in the Agronomy Department, Purdue University Contents: 1. Measuring Soil and Water pH 2. Why is Rain Acid? 3. Testing Soils for Aluminum Toxicity 4. Soil Has a Charge 5. Chemical Movement in Soils 6. Nitrates or Nitrites in Water or Food 7. Exposing a Rainbow of Color: How Chromatography Works! 8. Soil Colors 9. Clay Properties 10. Soil Erosion 11. Earthworm Activity and Biology 12. Preserving Soil Monoliths and Specimens in Vinyl Plastic 13. Germination and Vigor of Seeds (Warm Tests/Cold Tests) 14. Quick Test to Determine Seed Viability 15. Phosphorus in Plants 16. Starch Goes to Sugar as Plants Use Their Stored Energy for Regrowth 17. Plant Growth Experiments For more information contact: Dr. John G. Graveel or Sherry Fulk-Bringman Dept. of Agronomy 1150 Lilly Hall West Lafayette, IN 47907 (765) 494-8060 [email protected] http://www.agry.purdue.edu/courses/agry255/brochure/brochure.html 1. MEASURING SOIL AND WATER pH The symbol,...