E7 SOIL

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Across
  1. 4. a vital part of the earth, it is brown and dirty
  2. 6. kills unwanted fungus
  3. 8. causes the decreasing of soil quality
  4. 9. kills pest to provide better yield of crops
  5. 10. SOM
  6. 12. one of the causes of rise in the water table
  7. 14. 80% of the earths crust is made up of one of these elements
  8. 15. typically soil organic matter contains about ___% nitrogen ( spell the number out )
Down
  1. 1. inorganic matter that contains aluminum and silicates
  2. 2. includes the rotation of crops and the addition of fertilizers to replenish plant nutrients
  3. 3. waste that is caused from discharges and accidents from petroleum industry from oil fields, tankers, pipelines, and refining plants
  4. 5. breaking down of minerals to release nitrogen and phosphorus to the roots
  5. 7. element that controls osmosis
  6. 11. kills unwanted plants and weeds
  7. 13. accumulation of water soluble ions or salts int he soil due to continual irrigation to grow crops