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Questions1Alt - Study Questions Exam 1 1. 2. 3. 4. 5. 6. 7....

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Study Questions Exam 1 1. What are the four general components of soil? 2. Define regolith and solum. 3. What are the five master horizons? Give distinguishing features of each. 4. What is meant by an Ap horizon? Bt? Bg? 5. List three means by which plant roots come into contact with nutrients. 6. Soil color is defined in reference to what standard? 7. Black or brown color near the soil surface is usually due to what? 8. Red in the subsoil is due to what? Yellow? Gray? 9. What do the above soil colors indicate about aeration and drainage? Does mottling indicate good or poor aeration and drainage? 10. What does gley mean? 11. Define sand, silt and clay according to the USDA classification system. 12. What does soil texture mean? 13. What are the two general approaches to determining soil texture? 14. Explain what is meant by dispersion and flocculation of soil colloids. 15. Given data for percents sand, silt and clay, use a textural triangle to give the textural class name of a soil. 16. Contrast sandy and clay soils in terms of: a) ease of tillage b) aeration and water movement c) stickiness when wet d) bulk density e) surface area of particles 17. What is the general relationship between texture and surface area of soil solids per unit mass? How does surface area per unit mass affect such soil properties as water holding capacity and nutrient (chemical) adsorption capacity? 18. What is soil structure?
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19. Name the four general types of soil structure (geometries) and two types of structureless condition. 20. When Ca 2+ is the dominant adsorbed cation, the soil is likely to be (more / less) aggregated than when Na + is the dominant adsorbed cation. 21. What texture of soil would be most likely to have a single-grain structure? Massive? 22. How does soil structure affect aeration, infiltration and drainage? 23.
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This note was uploaded on 01/08/2012 for the course AGRO 2051 taught by Professor Gaston during the Fall '08 term at LSU.

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Questions1Alt - Study Questions Exam 1 1. 2. 3. 4. 5. 6. 7....

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