United States Department of Agriculture
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Table 1. 120 Basic Soils Represented By Surface And Subsurface Texture
  CN by OM percent
  Surface Texture Subsurface Texture HG

 0.5

 1.0

 2.0

 4.0
1 Sand Fine Sandy Loam A 66 65 63 58
2 Loamy Fine Sand Fine Sandy Loam A 69 68 67 64
3 Fine Sandy Loam Fine Sandy Loam A 72 71 70 67
4 Sand Silt Loam < 15% clay B 74 74 72 69
5 Loamy Fine Sand Silt Loam < 15% clay B 78 77 75 72
6 Fine Sandy Loam Silt Loam < 15% clay B 80 79 78 75
7 Sand Silty Clay Loam C 86 81 80 79
8 Loamy Fine Sand Silty Clay Loam C 88 85 83 82
9 Fine Sandy Loam Silty Clay Loam C 91 87 86 85
10 Sand Clay > 70% clay D 91 90 89 88
11 Loamy Fine Sand Clay > 70% clay D 92 91 90 89
12 Fine Sandy Loam Clay > 70% clay D 93 92 91 90
 
13 Loam Silt Loam < 15% clay B 74 74 72 69
14 Silt Loam < 15% clay Silt Loam < 15% clay B 78 77 75 72
15 Silt Loam < 15% clay Silt Loam < 15% clay B 80 79 78 75
16 Loam Silty Clay Loam C 86 81 80 79
17 Silt Loam < 15% clay Silty Clay Loam C 88 85 83 82
18 Silt Loam < 15% clay Silty Clay Loam C 91 87 86 85
19 Loam Clay > 70% clay D 91 90 89 88
20 Silt Loam < 15% clay Clay > 70% clay D 92 91 90 89
21 Silt Loam < 15% clay Clay > 70% clay D 93 92 91 90
 
22 Sandy Clay Loam Silty Clay Loam C 86 81 80 79
23 Clay Loam Silty Clay Loam C 88 85 83 82
24 Silty Clay Loam Silty Clay Loam C 91 87 86 85
25 Sandy Clay Loam Clay > 70% clay D 91 90 89 88
26 Clay Loam Clay > 70% clay D 92 91 90 89
27 Silty Clay Loam Clay > 70% clay D 93 92 91 90
 
28 Silty Clay Clay > 70% clay D 91 90 89 88
29 Clay < 70% clay Clay > 70% clay D 92 91 90 89
30 Clay > 70% clay Clay > 70% clay D 93 92 91 90

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