Page 72 - E-BOOK English

Soil classification

WRB: Eutric Fluvisols
Soil taxonomy: Coarse-loamy, mixed, superactive, nonacid, isohyperthermic Oxyaquic Ustifluvents

Soil series: Chiang Mai series (Cm)

Profile description

 0-15 cm (Ap) Very pale brown (10YR 7/3)
dry, yellowish brown (10YR 5/4) moist; loamy
sand; weak medium and fine subangular
blocky with some granular structures in the

top 3 cm; friable, nonsticky and nonplastic;
abundant fine and very fine roots;

moderately acid (field pH 6.0); abrupt and
wavy boundary.

 15-28 cm (C1) Pale brown (10YR 6/3) dry,
brown (10YR 4/3) moist; sandy loam; many

fine faint light gray (10YR 7/2) and yellowish
brown (10YR 6/6) mottles; weak medium
and coarse subangular blocky structures;

friable, slightly sticky and nonplastic; many
very fine roots; slightly acid (field pH 6.5);

abrupt, wavy boundary.

 28-46 cm (C2) Brown (10YR 4/3) fine sandy
loam to silt loam; few fine faint reddish
brown (5YR 4/4) mottles; moderate medium and fine subangular blocky structures; friable,

slightly sticky and slightly plastic; many small pieces of charcoals; many very fine roots;
slightly acid (field pH 6.5); abrupt, wavy boundary.

 46-53 cm (C3) Yellowish brown (10YR 5/6) sandy loam; common fine faint yellowish brown
(10YR 5/4) and few fine distinct brownish yellow (10YR 6/8) mottles; weak medium subangular
blocky structures; very friable, slightly sticky and nonplastic; few very fine roots; slightly acid
(field pH 6.5); clear, smooth boundary.

 53-100+ cm (C4) Brown (7.5YR 4/4) loamy coarse sand; few medium distinct gray (10YR 6/2)
mottles increasing with depth; very weak medium subangular blocky structures; very friable,
nonsticky and nonplastic; few very fine roots; slightly acid (field pH 6.5).

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