Page 75 - E-BOOK English

Soil classification

WRB: Gleyic Fluvisols
Soil taxonomy: Fine-loamy, mixed, active, nonacid, isohyperthermic Aquic (Fluventic) Haplustepts

Soil series: Sapphaya series (Sa)

Profile description

 0-12 cm (Ap1) Dark brown (10YR 3/3) silty
clay loam; common fine distinct strong brown
(7.5YR 4/6) mottles; fine crumb and weak fine
subangular blocky structures; friable, sticky,
plastic; many fine roots; common decayed
rice stems; moderately alkaline (field pH 8.0);
clear, smooth boundary.
 12-29 cm (Ap2) Very dark grayish brown (10YR 3/2)
silty clay loam to silty clay; common fine
distinct strong brown (7.5YR 4/6) mottles;
moderate medium subangular blocky structures;
firm, sticky, plastic; many very fine and
common fine roots; moderately alkaline (field
pH 8.0); clear, smooth boundary.

 29-48 cm (B1) Dark yellowish brown to
yellowish brown (10YR 4/4-5/4) sandy loam;
common fine distinct strong brown (7.5YR 4/6)
mottles; weak fine subangular blocky structure;
friable, slightly sticky, slightly plastic; biological
activities; moderately alkaline (field pH 8.0);
clear, smooth boundary.
 48-62 cm (B2) Dark grayish brown (10YR 4/2) clay loam; common fine distinct yellowish brown
(10YR 5/6) mottles; weak medium subangular blocky structure; firm, sticky, plastic; very few very
fine roots; few soft and slightly hard Fe&Mn concretions; moderately alkaline (field pH 8.0);
gradual, smooth boundary.

 62-85 cm (B3) Grayish brown (10YR 5/2) clay loam; common fine distinct yellowish brown
(10YR 5/6) mottles; weak medium subangular blocky structure; firm, sticky, plastic; very few very
fine roots; few soft and slightly hard Fe&Mn concretions; moderately alkaline (field pH 8.0);
gradual, smooth boundary.

 85-117 cm (B4) Brown (10YR 5/3) clay loam; common fine distinct yellowish brown (10YR 5/6)
mottles; weak fine and medium subangular blocky structures; firm, sticky, plastic; few soft Fe&Mn
concretions; about 3% of secondary lime concretions Ø 2-5 mm; moderately alkaline (field
pH 8.0); clear, smooth boundary.
 117-133 cm (C1) Yellowish brown (10YR 5/6) loamy sand; few fine faint mottles; weak fine
subangular blocky structure; very friable, nonsticky, nonplastic; moderately alkaline (field pH 8.0);
gradual, smooth boundary.
 133-155+ cm (C2) Yellowish brown (10YR 5/4) fine sandy loam; common fine faint yellowish brown
(10YR 5/6) mottles; weak fine subangular blocky structure; friable, slightly sticky, slightly plastic;
few soft and slightly hard Fe&Mn concretions; moderately alkaline (field pH 8.0).

73