Soil formation and Conservation

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Across
  1. 4. contains the organic matter on top
  2. 5. the smallest soil particle
  3. 7. soil in this area is thick
  4. 8. the botonist in the south that solved the problem of soil fertilit
  5. 13. used to find the texture of soil when given the percentage of the different soil particles
  6. 15. this organism is responsible for most of the mixing of soil
  7. 17. the soil texture that is best for growing plants
  8. 18. the largest soil particle
  9. 19. farmers plow their fields with the curve of the slope
  10. 21. soil that has all the nutrients needed to grow plants
Down
  1. 1. these type of organisms will break down dead material into humus
  2. 2. contains the subsoil
  3. 3. something in the environment that humans use
  4. 6. soil in this area is thin
  5. 9. contains the topsoil
  6. 10. soil that is lacking the nutrients to grow plants
  7. 11. when a farmer plants on crop one year and a different crop the next
  8. 12. the material that soil is made from
  9. 14. the event that happened in the 1930 in the United states where drought and wind destroyed the soil on farmlands
  10. 16. organic material in soil
  11. 20. a class of plants that have small nodes in their roots that contain bacteria that fixes nitrogen into the soil