Soil Texture

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<strong>Soil</strong> <strong>Texture</strong> (mineral material only) ‣ Sand - gritty ‣ Silt - smooth, velvety ‣ Clay - slick, sticky
Systems for Classifying Particle Size Distributions ‣ USDA System (ie.. Sandy Loam) ‣ AASHTO: American Association of State Highways (ie( ie. . A-1) A ‣ Unified Engineering (ie.. SM) ‣ Wentworth (phi #)
Page 1 and 2: Soil Texture 3/19/2005 Soil and Sit
Page 3 and 4: CIDWT/University Disclaimer These m
Page 5 and 6: Soil Texture ‣ Use texture to mak
Page 7: Soil Texture ‣ Mineral material o
Page 14: USDA Textural Classes (12) ‣ Sand
Page 17 and 18: 40 % Sand 40 % Silt 20 % Clay Sand
Page 19 and 20: 25 % Sand 30 % Silt 45 % Clay
Page 21 and 22: 65 % Sand 20 % Silt ?? % Clay
Page 23 and 24: 65 % Sand 20 % Silt 15 % Clay SANDY
Page 25 and 26: 40 % Sand 30 % Silt 30 % Clay
Page 27 and 28: Particle-Size Distribution ‣ Part
Page 29: 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 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 and 98:
Type of Organic Soil ‣ Muck - Hig
Page 99:
Knowing about texture can keep you
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Soil Texture

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