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By: Priscilla Arevalo Angelica Alvarado Alyssa Megan Eileen Gao

Soil and Agriculture (p.229-233). By: Priscilla Arevalo Angelica Alvarado Alyssa Megan Eileen Gao. What is a Soil Profile?. Organic. Topsoil. Elluviation. Subsoil. Weathered P.M. Bedrock. Soil Properties. Soil Color Soil Texture Clay Silt Sand Loam Soil Structure Soil pH.

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By: Priscilla Arevalo Angelica Alvarado Alyssa Megan Eileen Gao

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  1. Soil and Agriculture (p.229-233) By: Priscilla Arevalo Angelica Alvarado Alyssa Megan Eileen Gao

  2. What is a Soil Profile? Organic Topsoil Elluviation Subsoil Weathered P.M. Bedrock

  3. Soil Properties Soil Color Soil Texture Clay Silt Sand Loam Soil Structure Soil pH

  4. Cation Exchange is Vital for Plant Growth

  5. Regional Differences in Soil Traits Can Affect Agriculture Tropical Rain Forest Temperate Grassland • Soil characteristics vary from place to place. • Some regions have more fertile soils than others.

  6. Human Practices that have increased vulnerbility of soil • Erosion: human activities have increased by 10-40 times rate of erosion occuringglobally • Human practices: • Industrial agriculture • Deforestation • Roads • Climate change • Urban spraw

  7. DEGRADATION OF SOIL Mulching Contour Barriers Rock Dams Conservation Measures: The largest areas of concern: Asia & Africa. Central America has highest percentage/worst degrees of soil degradation

  8. “Climate Change to Disrupt Soil Nutrients inDrylands” • Drop in nitrogen and carbon concentrations could have serious effects on ecosystem services. • Study measured the nitrogen, carbon, and phosphorus content in soils at 224 sites.

  9. “Climate Change to Disrupt Soil Nutrients in Drylands” • Drylands consist of 40% of the world’s land area. • Climate change can make these areas drier. • It is hypothesized that the ecosystem properties of drylands may be irreversible.

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