October 12 2011
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October 12, 2011 PowerPoint PPT Presentation


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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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October 12, 2011

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October 12 2011

October 12, 2011


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!


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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