How Land Use Causes Soil Loss<br />Chapter 7 Section 4<br />
I.  Agriculture and Soil Loss<br />Soil is a very important resource for the agricultural business. <br />Many resources a...
II.  Historic Tragedy:  The Dust Bowl<br />Great Plains:  1800’s<br />People moved to the Great Plains.<br />Plowed under ...
The Great Plains Drought of 1931<br />Drought started in 1931 and lasted several years. <br />Soil became totally unprotec...
The Great Plains Drought of 1931<br />Soil was blown to the ocean or piled up against houses. <br />Many farmers went bank...
The Great Plains Drought of 1931<br />In areas able to support trees, wind breaks were planted. <br />Over time, the ferti...
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Chapter 7 section 4 (land use and soil loss)

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Chapter 7 section 4 (land use and soil loss)

  1. 1. How Land Use Causes Soil Loss<br />Chapter 7 Section 4<br />
  2. 2. I. Agriculture and Soil Loss<br />Soil is a very important resource for the agricultural business. <br />Many resources are directly tied to the soil.<br />Food, paper products, natural fibers. <br />Vegetables, grains, cotton plants. <br />Cattle, sheep, and pigs feed off the land. <br />When farmers harvest crops the soil is directly exposed to the weather. <br />Erosion occurs. <br />Soil loses nutrients when topsoil is eroded. <br />
  3. 3. II. Historic Tragedy: The Dust Bowl<br />Great Plains: 1800’s<br />People moved to the Great Plains.<br />Plowed under the native drought resistant crops. <br />Began to farm large areas.<br />Corn and wheat were planted; Cattle and sheep grazed on land.<br />As farming continued the natural drought resistant grasses with their extensive root system became increasingly scarce and erosion increased dramatically. <br />
  4. 4. The Great Plains Drought of 1931<br />Drought started in 1931 and lasted several years. <br />Soil became totally unprotected, wind began blowing the soil away. (erosion)<br />Dust storms raged.<br />More than 8cm of topsoil was lost! <br />
  5. 5. The Great Plains Drought of 1931<br />Soil was blown to the ocean or piled up against houses. <br />Many farmers went bankrupt and moved elsewhere. <br />1935: Federal Government began regulating agriculture.<br />Crop rotation, terracing, and contour plowing was required. (Section 3 notes) <br />
  6. 6. The Great Plains Drought of 1931<br />In areas able to support trees, wind breaks were planted. <br />Over time, the fertility of the Great Plains was restored. <br />

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