october 12 2011
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October 12, 2011. Objective: By using a soil map determine areas of good fertility. Agenda: Go over soil Triangle Soil Map of N.C. Page 372 answer questions 1-6 Soil conservation notes Erosion of Topsoil activity Homework: Page368-369 answer questions 1-13 , write out answers only!.

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Objective:

  • By using a soil map determine areas of good fertility.

Agenda:

  • Go over soil Triangle
  • Soil Map of N.C.
    • Page 372 answer questions 1-6
  • Soil conservation notes
  • Erosion of Topsoil activity
  • Homework:
  • Page368-369 answer questions 1-13 , write out answers only!
soil erosion
Soil Erosion
  • Erosion- Transportation of soil by wind, water, or ice.
    • Worldwide removes 25.4 Billion tons/yr.
    • Made worse by deforestation and desertification.
    • Poor agricultural practices increase erosion and lead to the transport of associated fertilizers and pesticides.
soil erosion1
Soil Erosion
  • Most current agricultural areas lose topsoil faster than it can be replenished.
  • Wind erosion may not be as evident as water erosion, but is still common.
    • Most common in dry, treeless areas.
    • Great Plains have had four serious bouts of wind erosion since late 1800’s.
soil conservation practices
Soil Conservation Practices
  • When topsoil is lost, fertility is reduced or destroyed, thus fertilizers must be used to restore fertility.
    • Raises food costs, and increases sediment loads in waterways.
    • Over 20% of US land is suitable for agriculture, but only 2% does not require some form of soil conservation practice.
soil conservation practices1
Soil Conservation Practices
  • Contour Farming - Tilling at right angles to the slope of the land. Each ridge acts as a small dam.
soil conservation practices2
Soil Conservation Practices
  • Strip Farming - Alternating strips of closely sown crops to slow water flow.
soil conservation practices3
Soil Conservation Practices
  • Terracing - Level areas constructed at right angles to the slope to retain water - good for very steep land.
soil conservation practices4
Soil Conservation Practices
  • Waterways - Depressions in sloping land where water collects and flows off the land.
soil conservation practices5
Soil Conservation Practices
  • Windbreaks - Planting of trees or other plants that protect bare soil from full force of the wind.
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