Page 120 - E-BOOK English

Soil classification

WRB: Skeletic Luvisols
Soil taxonomy: Clayey-skeletal, mixed, semiactive, isohyperthermic Ultic Haplustalfs

Soil series: Tha Li series (Tl)

Profile description

 0-12 cm (A) Dark brown (7.5YR 3/2) loam;
moderate fine and medium subangular blocky
and moderate fine and medium granular structures

at the uppermost; slightly hard, slightly

firm, slightly sticky, plastic; few fine and
medium animal holes; common termite holes;
many fine, common medium and few coarse

roots; few scatters small and medium partly

weathered andesite fragments; neutral (field
pH 7.0); gradual, smooth boundary.

 12-31 cm (BA) Reddish brown (5YR 4/4)
gravelly sandy clay loam; moderate fine
and medium subangular blocky structures;

slightly hard, friable, sticky, plastic; moderate
broken clay coatings on ped faces,

moderately thick continuous clay coatings in
pores; fine and medium animal holes; common

fine, medium and few large roots; coarse frac-
tion consists of 15 to 20 percent of partly

weathered andesite fragments; moderately acid (field pH 6.0); gradual, smooth boundary.

 31-80+ cm (Bt) Reddish brown (2.5YR 4/4) very gravelly clay; moderate coarse and medium
subangular blocky structures; slightly hard, friable, sticky, plastic; moderately thick broken clay

coatings on ped faces, thick continuous clay coatings in pores; common fine and medium
roots; coarse fraction consists of 60 to 70 percent partly weathered andesite fragments and

few slightly hard iron-manganese concretions; strongly acid (field pH 5.5).

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