TABLE 2.1. Representative Soil Characteristics (Based on Davis and DeWiest, 1966; Freeze and Cherry, 1979; Harr, 1962; Israelse and Hansen 1962; Lane and Nyhan, 1984; Linsley, Kohler, and Paulus, 1975; Mills et al., 1985; Schultz, et al., 1986.)
Soil-Texture Classification Soil Composition (based on USDA Textural Diagram) Saturated Hydraulic Conductivity, (cm/s) Representative Root- Zone Depth, cm Porosity %
% Sand % Silt % Clay
Sand 92 5 3 6.6E-03 73 38.0
Loamy Sand 83 11 6 1.9E-03 76 43.7
Sandy Loam 65 25 10 7.2E-04 79 44.2
Loam 42 38 20 3.7E-04 55 46.6
Silty Loam 20 65 15 2.0E-04 31 46.3
Silt 7 88 5 1.3E-04 44 44.2
Sandy Clay Loam 60 14 26 1.1E-04 57 39.8
Clay Loam 32 35 33 6.2E-05 70 47.7
Silty Clay Loam 10 57 33 4.6E-05 64 49.0
Sandy Clay 52 7 41 3.4E-05 57 43.0
Silty Clay 7 46 47 2.6E-05 50 48.6
Clay 20 20 60 1.9E-05 43 47.5
             
             
Soil-Texture Classification Dry Bulk Density, g/cm Field Capacity, % Available Water Capacity, cm/cm Soil-Type Coefficient USLE K-Factor by Organic Matter Content
<0.5% 2% 4%
Sand 1.64 9.0 0.050 4.05 0.05 0.03 0.02
Loamy Sand 1.49 12.0 0.060 4.38 0.12 0.10 0.08
Sandy Loam 1.48 17.5 0.085 4.90 0.27 2.24 0.19
Loam 1.42 23.5 0.110 5.39 0.38 0.34 0.29
Silty Loam 1.42 27.5 0.155 5.30 0.48 0.42 0.33
Silt 1.48 28.0 0.190 5.30 0.60 0.52 0.42
Sandy Clay Loam 1.60 24.0 0.083 7.12 0.27 0.25 0.21
Clay Loam 1.39 34.0 0.140 8.52 0.28 0.25 0.21
Silty Clay Loam 1.35 37.5 0.150 7.75 0.37 0.32 0.26
Sandy Clay 1.51 32.0 0.090 10.40 0.14 0.13 0.12
Silty Clay 1.36 42.0 0.145 10.40 0.25 0.23 0.19
Clay 1.39 40.0 0.100 11.40 0.25 0.23 0.19