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Title:

Soil Color

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Title: Soil Physical Properties Last modified by: Jenna LaFave Created Date: 9/30/2005 1:07:50 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Soil Color


1
Soil Color
2
Soil Color
  • Has little effect on the behavior and use of soil
  • Exception Soil warming
  • Provides valuable clues, which helps scientists
    classify and identify soil types and properties

3
All Soil is Brown, Right?
  • Wrong!
  • Soils vary in color depending on material make-up
    and location.
  • The Munsell System of Color Notation is a color
    catalog.
  • Soil scientists compare the soil next to the
    color chips to find a visual match and assign the
    corresponding Munsell notation with the soil.
  • The wide use and acceptance of the Munsell System
    allows for direct comparison of soils anywhere in
    the world.

4
The Munsell system
  • The system categorizes by three components hue,
    value, and chroma.
  • Hue the specific color
  • Value the lightness or darkness of color
  • Chroma the light intensity
  • Written Hue Value/Chroma
  • 10 YR 3/2

Spectrum of Hues Shown Here
5
Colorful Soils
  • Red Desert California, Arizona, and Nevada

6
Colorful Soils
  • Gray Desert Idaho, Utah, Nevada

7
White Sands New Mexico
Colorful Soils
8
Colorful Soils
  • Green Sands Atlantic Coast Hawaii

9
Red beds Texas and Oklahoma
Colorful Soils
10
Dark surface soils in the Great Plains the
Corn Belt are from rich organic matter.
Colorful Soils
Hwang Ho River in China carries yellow sediment
creating a yellow river bed.
11
Why?
  • Reddish, yellowish, or brownish Iron oxides
  • Hematite red
  • Goethite yellowish brown
  • Ferrihydrite reddish brown
  • Grey Quartz and silicate minerals
  • White Carbonates or other salts
  • Green Potassium
  • Black/very dark brown Organic matter
  • Black Manganese oxides

12
Other Uses for Soil
  • Native North American cultures used earth colors
    as body paints.
  • Modern American culture uses colored earth in
    cosmetics and ceramics and as pigments for paints.

13
Soil Color Activities
  • Instructions at http//soils4teachers.org/lessons
    -and-activities
  • Soil Crayons
  • Soil Painting
  • Examples of mud paintings at www.mudpainting.com
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