Page 159 - E-BOOK English

Soil classification

WRB: Pellic Vertisols
Soil taxonomy: Very-fine, smectitic, isohyperthermic Typic Haplusterts

Soil series: Lop Buri series (Lb)

Profile description

 0-23 cm (Ap) Black (10YR 2/1) clay; moderate
medium and coarse subangular blocky with

granular structures on the upper surface;
very hard, firm, sticky, plastic; common very

fine and fine roots; few fine lime concretions
and slightly calcareous; moderately alkaline

(field pH 8.0); clear, smooth boundary.

 23-49 cm (Bss1) Black (10YR 2/1) clay;
moderate medium and coarse subangular

blocky structures; firm, sticky, plastic; few
very fine roots; few fine lime concretions

and slightly calcareous; some slickensides;
moderately alkaline (field pH 8.0); gradual,

smooth boundary.

 49-85 cm (Bss2) Black (10YR 2/1) clay; mod-
erate medium and coarse subangular blocky

structures; firm, sticky, plastic; few fine roots;
clear slickensides; few fine lime concretions and calcareous; moderately alkaline (field pH 8.0);

clear, smooth boundary.

 85-135 cm (Bss3) Black (10YR 2/1) to very dark gray (10YR 3/1) clay; moderate fine and medium

subangular blocky structures; friable, sticky, plastic; few fine roots; clear slickensides; about
3% fine lime concretions and calcareous; moderately alkaline (field pH 8.0); clear, smooth

boundary.

 135-180+ cm (BCk) Grayish brown (10YR 5/2) clay loam; about 30% of soft and hard lime
concretions or marl and strongly calcareous; moderately alkaline (field pH 8.0).

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