Page 38 - World Reference Base for Soil Resources of Thailand

Land Development Department Library

Soil classification

WRB: Humic Acrisols
Soil taxonomy: Fine, kaolinitic, isohyperthermic Typic Kandiustults

Soil series: Nong Mot series (Nm)

Profile description

 0-5/8 cm (Ap) Very dark grayish brown (10YR 3/2)
loam; weak medium and fine subangular blocky

breaking to strong granular structures; soft, very
friable, slightly sticky and slightly plastic; very
fine and fine roots; moderately acid (field pH
6.0); abrupt and wavy boundary.

 5/8-23 cm (BA) Dark reddish brown (5YR 3/4)
clay loam with discernable sand fraction;
moderate medium and fine subangular
blocky structures; slightly hard, friable, sticky
and slightly plastic; common very fine roots;

strongly acid (field pH 5.5); clear and smooth
boundary.

 23-56 cm (Bt1) Reddish brown (5YR 4/4) clay
loam with discernable sand fraction; moderate
fine and medium subangular blocky structures;
hard, friable, sticky and slightly plastic; patchy

moderately thick cutans on ped faces,
continuous moderately thick cutans in pores;
very few very fine roots; moderately acid (field

pH 6.0); clear and smooth boundary.

 56-109 cm (Bt2) Yellowish red (5YR 4/8) clay with discernable sand fraction; moderate
medium and fine subangular blocky structure; slightly hard, friable, sticky and slightly plastic;
broken moderately thick clay coatings on ped faces and in pores; few very fine roots;
strongly acid (field pH 5.5); clear and smooth boundary.

 109-130+ cm (Bt3) Red (2.5YR 4/6) to yellowish red (5YR 4/8) very gravelly clay; massive to
weak coarse subangular blocky structures; hard, friable, sticky and nonplastic; patchy to

broken moderately thick clay coatings on ped faces and angular quartz gravels; very few
very fine roots; strongly acid (field pH 5.5).

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