Page 35 - World Reference Base for Soil Resources of Thailand
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Land Development Department Library


              การจำาแนกดิน (Soil classification)


              WRB: Gleyic Skeletic Acrisols
              Soil taxonomy: Loamy-skeletal, mixed, subactive, isohyperthermic Aeric Plinthic Paleaquults

              Soil series: Phen series (Pn)


              Profile description


                 0-14 cm (Apg) Grayish brown (10YR 5/2) loam;
                  few fine faint dark yellowish brown (10YR 4/6)
                  mottles; weak medium subangular blocky
                  structures; friable, slightly sticky, slightly

                  plastic, few termite holes; strong acid (field
                  pH 5.5); clear, smooth boundary.

                 14-45 cm (Btg) Gray to grayish brown
                  (10YR 5/1-2) clay loam; many fine distinct
                  yellowish brown (10YR 5/8) and strong brown
                  (7.5YR 5/8) mottles; weak coarse subangular
                  blocky structures; friable, slightly sticky,
                  slightly plastic; patchy thin clay coating on
                  ped faces; few fine roots; few termite holes;
                  strongly acid (field pH 5.5); abrupt smooth

                  boundary.
                 45-77 cm (Btc) Light brownish gray to pale
                  brown (10YR 6/2-3) very gravelly clay loam;
                  many fine distinct strong brown (7.5YR 5/8)

                  and common fine prominent red (2.5YR 4/8)
                  mottles; (coated colour around gravels);
                  massive to weak medium subangular blocky structures friable, sticky, plastic; patchy thin clay
                  coating on ped faces; gravels composed of 70 percent hard ironstone nodules; very strongly
                  acid (field pH 5.0); clear, smooth boundary.

                 777-120 cm (BCg1) Light brownish gray (10YR 6/2) slightly gravelly clay; many fine distinct yellowish
                  brown (7.5YR 5/8) and prominent red (2.5YR 4/8) mottles; massive to weak medium subangular
                  blocky structures; friable, sticky, plastic; patchy thin clay coating on ped faces; gravels composed
                  of soft red shale (2.5YR 4/8-10YR 4/8) and ironstone nodules; very strongly acid; (field pH 4.5);

                  clear, smooth boundary.

                 120-180 cm (BCg2) Pinkish gray (10YR 7/2) slightly gravelly clay loam; many fine distinct
                  yellowish brown (7.5YR 5/8) and prominent red (2.5YR 4/8) mottles; massive to weak
                  medium subangular blocky structures; friable, sticky, plastic; gravels composed of soft red
                  shale (2.5YR 4/8) and ironstone nodules; very strongly acid (field pH 4.5).


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