This lecture will help you understand: Soils and agriculture


Exposure of pin shows amount of erosion since it was placed in ground, level with surface



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Exposure of pin shows amount of erosion since it was placed in ground, level with surface.

Soil erosion

  • Soil erosion is a global problem.

  • Coupled with rapid population growth, these two forces spell crisis for the future of agriculture.

  • Humans are the primary cause of erosion.

  • Humans are over 10 times more influential at moving soil than are all other natural processes combined.

Desertification

A loss of more than 10% productivity due to:

  • Erosion

  • Soil compaction

  • Forest removal

  • Overgrazing

  • Drought

  • Salinization

  • Climate change

  • Depletion of water resources

  • etc.

Soil degradation on drylands

Caused mostly by wind and water erosion

The Dust Bowl

  • Drought and degraded farmland produced the 1930s Dust Bowl.

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