Page 30 - E-BOOK English

การจำาแนกดิน (Soil classification)

WRB: Gleyic Acrisols
Soil taxonomy: Fine-silty, mixed, subactive, isohyperthermic Typic Paleaquults

Soil series: Hin Kong series (Hk)

Profile description

 0-15/18 cm (Apg) Mixed white and light gray
(10YR 8/1 and 10YR 7/2) silt loam; common fine
and medium distinct brownish yellow (10YR 6/8)
mottles; moderate weak fine and medium
subangular blocky structures; slightly hard, friable,
sticky, slightly plastic; common very fine and
fine roots; moderately acid (field pH 6.0); clear,
wavy boundary.

 15/18-28 cm (Bg) Mixed white and light gray
(10YR 8/1 and 10YR 7/2) silt loam; many medium
and coarse distinct brownish yellow (10YR 6/6-8)
mottles; moderate medium and coarse subangular
blocky structures; slightly hard, friable, sticky,
plastic; common very fine and fine roots; strongly
acid (field pH 5.5); clear, smooth boundary.

 28-44 cm (Btg1) Mixed white and pale brown
(10YR 8/1 and 10YR 6/3) silt loam; many medium
and coarse distinct brownish yellow (10YR 6/8),
few fine distinct strong brown (7.5YR 4/6) mottles;
strong medium and coarse subangular blocky structures; hard, friable, sticky, plastic; patchy
moderately thick cutan on ped faces and in pores; few very fine roots; few to common soft
black Fe&Mn concretions; very strongly acid (field pH 5.0); clear, smooth boundary.
 44-82/86 cm (Btg2) Grayish brown (10YR 5/2) silty clay loam; common medium distinct brownish
yellow and yellowish brown (10YR 6/8 and 10YR 5/6) mottles; strong medium and coarse
subangular blocky structures; very hard, firm, sticky, plastic; patchy moderately thick cutan on
ped faces and in pores; common soft black Fe&Mn concretions; very strongly acid (field pH 5.0);
clear, wavy boundary.
 82/86-140 cm (Btg3) Light brownish gray (10YR 6/2) silty clay loam; many medium and coarse
distinct pale brown and yellowish brown (10YR 6/3 and 10YR 6/8) mottles; strong medium
and coarse subangular blocky structures; very hard, firm, very sticky, very plastic; patchy
moderately thick cutan on ped faces and in pores; some organic matter coated on ped
faces; strongly acid (field pH 5.5); clear, smooth boundary.

 140-200 cm (Btg4) Grayish brown (10YR 5/2) silty clay loam; common fine and medium
distinct yellowish brown (10YR 6/8) mottles; strong coarse subangular blocky structures;
slightly hard, firm, very sticky, very plastic; patchy moderately thick cutan on ped faces and
in pores; strongly acid (field pH 5.5).
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