Page 156 - E-BOOK English

Soil classification

WRB: Chromic Vertisols
Soil taxonomy: Very-fine, smectitic, isohyperthermic (Aeric Chromic) Ustic Endoaquerts

Soil series: Chong Khae series (Ck)

Profile description

 0-21 cm (Apg) Dark gray (10YR 4/1) clay (with
some reddish coarse sand grains); many fine
and medium distinct strong brown

(7.5YR 5/8) mottles; strong fine and medium
granular in upper 2 cm, weak medium blocky

and granular below; very hard, many roots;
strongly acid (field pH 5.5); clear, smooth

boundary.

 21-46 cm (Bg) Grayish brown (10YR 5/2) clay

(with a few sand grains); many fine prominent
red (10R 4/6), few fine prominent yellowish

red (5YR 5/8) mottles; moderate fine and very
fine angular blocky structures; very sticky, very

plastic; common pressure faces on ped faces;
few roots; strongly acid (field pH 5.5);

gradual, smooth boundary.

 46-100+ cm (Bssg) Grayish brown (10YR 5/2)
clay (with few sand grains); many fine and

medium prominent red (10R4/6) mottles;
moderate very fine and fine angular blocky

structures; very sticky, very plastic; many
pressure faces on peds and large slickensides

increasing with depth; few roots; moderately
acid (field pH 6.0).

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