Naturalists at Large: Soil composition

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Naturalists at Large Soil composition Slide Show

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Naturalists at Large: Soil composition

  1. 1. 4th GradeSpringville, Utah
  2. 2. Where does soil come from? •Rocks •Minerals •Organic Matter
  3. 3. oA TOP SOILEB SUBSOILCR
  4. 4. Sagebrush-Cold Desert
  5. 5. What are the main components of soil? • Mineral Matter • Air • Water • Organic Matter
  6. 6. SOIL COMPONENTS idealized soil 25% AIR FILLED PORES 25 %WATER FILLED PORES 50 % SOIL SOLIDS
  7. 7. Soil Components (volume basis)
  8. 8. Note: clays are microscopic in size !
  9. 9. Soil separate particle diameter (mm)____________________________ Sand . . . . . . . . . 2.0 - 0.05 Silt . . . . . . . . . . 0.05 - 0.002 Clay . . . . . . . . . . <0.002 SAND SILT CLAY
  10. 10. Clay mineralsphotographedwith an electronMicroscope.Note: they are plateor flake like andare stacked on topof each other.They are electricallycharged and act likemagnets that attractand hold plantnutrients.
  11. 11. What causes soil erosion? Water Wind No Vegetation
  12. 12. How did the Canyon Landsof Utah form?
  13. 13. What are the FACTORS that make SOIL? TIME 1000’S TO 10,000’S OF YEARS LAY OF THE LAND TOPOGRAPHYLIVING ORGANISMS ANIMALS AND PLANTS CLIMATE HOT/COLD, WIND/RAIN PARENT MATERIAL ROCKS AND MINERALS
  14. 14. Physical land features
  15. 15. What are some practices Of SOILCONSERVATION? Terracing Strip Cropping Contour Plowing Tilling Wind Breaks Ground Covers
  16. 16. Internet Sites• http://www.tx.nrcs.usda.gov/class/sammy.htm

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