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ͪشԹ  :  ʺҺ  Sop Prap (So)
 
 
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A
0-18
Black (10YR2/1) clay; strong fine and medium subangular blocky structure; the horizon is friable but aggregates are firm, sticky, plastic; few subangular gravels of hard basalt; abundant very fine and medium roots; neutral (field pH 7.0); clear, smooth boundary.
Bw
18-30/37
Very dark brown (10YR2/2) clay; strong medium and fine subangular blocky structure; the horizon is friable but aggregates are firm, sticky, plastic; frequent subangular basalt gravels and many coarse sand size, yellow weathering basalt fragments; abundant very fine and medium roots; mildly alkaline (field pH 7.5); abrupt, irregular boundary.
R
30/37+
Gray, hard basalt with very dark brown (10YR2/2) clay in cracks; the rocks have a skin of weathered material 0.5 to 1 mm thick; common fine and very fine roots; occur in cracks; slightly acid (field pH 6.5).