Page 111 - E-BOOK English

Soil classification

WRB: Chromic Luvisols
Soil taxonomy: Fine-loamy, mixed, semiactive, isohyperthermic Ultic Paleustalfs

Soil series: Phetchabun series (Pe)

Profile description

 0-17 cm (A) Brown to dark brown (7.5YR 4/2)
sandy loam; moderate fine and medium
subangular blocky structures; extremely hard,
friable, slightly sticky, slightly plastic; many very

fine roots; slightly alkaline (field pH 7.5); clear,
smooth boundary.

 17-37 cm (Bt1) Brown to dark brown (7.5YR 4/4)
sandy loam; weak coarse subangular blocky
structure; extremely hard, friable, slightly sticky,
slightly plastic; patchy thin cutans on ped
faces; few very fine roots; very strongly acid
(field pH 5.0); clear, smooth boundary.

 37-73 cm (Bt2) Yellowish red (5YR 5/6)
sandy clay loam; moderate medium and coarse
subangular blocky structures; very hard, friable,
sticky, plastic; broken moderately thick cutans
on ped faces and in pores; few very fine roots;
very strongly acid (field pH 5.0); clear, smooth

boundary.

 73-93 cm (Bt3) Yellowish red (5YR 4/6) sandy
clay loam; common fine distinct mottles of brownish yellow (10YR 6/6); moderate medium
and coarse subangular blocky structures; hard, friable, sticky, plastic; broken moderately thick
cutans on ped faces and in pores; very few very fine roots; very strongly acid (field pH 5.0);
clear, smooth boundary.

 93-150 cm (Btc) Yellowish brown to light yellowish brown (10YR 5-6/4) very gravelly sandy
clay loam; weak fine and medium subangular blocky structures; hard, friable, sticky, slightly
plastic; patchy thin cutans on ped faces and gravels. Gravels are mainly laterite and few
quartz about 70-80%; neutral (field pH 7.0); clear, smooth boundary.

 150-195 cm (C) Yellowish brown (10YR 5/4) gravels; gravels are mainly quartz few sandstones
and laterite diameter up to 10 cm; slightly alkaline (field pH 7.5); clear, smooth boundary.

 195-220 cm (2C) Yellowish brown (10YR 5/6) gravelly clay; many fine and medium
distinct mottles of yellowish red (5YR 5/8); slightly alkaline (field pH 7.5).

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