Soil Texture

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Interpreting Textural Modifiers Rules of thumb: ‣ As coarse fragments (CF) increase loading rates decrease ‣ As CF becomes platy loading rates decrease ‣ As sands become finer loading rates decrease
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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
Page 32 and 33: Textural Groups for OSWW ‣ Group
Page 34 and 35: 25 % Sand 30 % Silt 45 % Clay CLAY
Page 36 and 37: 40 % Sand 30 % Silt 30 % Clay CLAY
Page 38 and 39: Determination of Texture ‣ Field
Page 40 and 41: Field determination of texture ‣
Page 44 and 45: The length of the ribbon will depen
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 90 and 91: Organic Matter in Soils ‣ Colorin
Page 92 and 93: Organic Matter Subdivisions ‣ Muc
Page 94 and 95: Identifying Organic Material by “
Page 96 and 97: Types of Soil Organic Materials ‣
Page 98 and 99: Identifying Organic Soil Type ‣ R
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Soil Texture

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