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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

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


Cation Exchange is Vital

for Plant Growth


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.


Human practices that have increased vulnerbility of soil
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


Degradation of so il
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


Climate change to disrupt soil nutrients in drylands
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.


Climate change to disrupt soil nutrients in drylands1
“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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