Soil Texture

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Identifying Organic <strong>Soil</strong> Type ‣ Rub moist sample between fingers 10 times ‣ Examine material with hand lens ‣ Look for fibers…not live roots... and estimate percent ‣ Fibers are smaller than 2 cm (approx. 1”) and show cellular structure
Knowing about texture can keep you from getting stuck if nothing else
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Soil Texture 3/19/2005 Soil and Sit
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CIDWT/University Disclaimer These m
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Soil Texture ‣ Use texture to mak
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Soil Texture ‣ Mineral material o
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Systems for Classifying Particle Si
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USDA Textural Classes (12) ‣ Sand
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40 % Sand 40 % Silt 20 % Clay Sand
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25 % Sand 30 % Silt 45 % Clay
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65 % Sand 20 % Silt ?? % Clay
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65 % Sand 20 % Silt 15 % Clay SANDY
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40 % Sand 30 % Silt 30 % Clay
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Particle-Size Distribution ‣ Part
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Sand Fractions ‣ Fraction Size
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Textural Groups for OSWW ‣ Group
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25 % Sand 30 % Silt 45 % Clay CLAY
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40 % Sand 30 % Silt 30 % Clay CLAY
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Determination of Texture ‣ Field
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Field determination of texture ‣
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The length of the ribbon will depen
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Page 48: Field determination of texture ‣
Page 51 and 52: Laboratory Determination of Particl
Page 53 and 54: Determining Percent Silt and Clay (
Page 55 and 56: Stokes’ Law: V = 2r 2 g(p s -p l
Page 57: At 20 o C how long does it take a 2
Page 62: Plunger for mixing soil in column
Page 71 and 72: 25 ml Lowy Pipette for silt and cla
Page 73 and 74: Textures Classes with Sand-Size Siz
Page 75 and 76: Terms for describing rock fragments
Page 77 and 78: Using Rock Fragment Modifiers ‣ L
Page 79 and 80: Relating Texture to Hydraulics 3/19
Page 81: Median percolation rates for 220 su
Page 89 and 90: Organic Matter 3/19/2005 Soil and S
Page 91 and 92: Organic Matter Subdivisions ‣ Org
Page 93 and 94: Organic Carbon Content % Organic Ca
Page 95 and 96: Types of Soil Organic Materials ‣
Page 97: Type of Organic Soil ‣ Muck - Hig
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Soil Texture

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