Page 132 - E-BOOK English

Soil classification

WRB: Stagnic Plinthosols
Soil taxonomy: Very-fine, kaolinitic, isohyperthermic Typic Plinthaquults

Soil series: Klaeng series (Kl)

Profile description

 0-10 cm (Apg) Dark grayish brown (10YR 4/2)
clay loam; few iron mottles coating along
roots channels; moderate medium subangular

blocky structure; slightly hard, slightly sticky,
and slightly plastic; common medium tubular,
few medium interstitial pores; many fine and
medium roots; very strongly acid (field pH 5.0);
clear, wavy boundary.

 10-26 cm (Bg) Light gray to gray (10YR 6/1) clay;
many fine prominent yellowish red (5YR 5/6)
mottles along roots channels; moderate

medium and coarse subangular blocky structures;
hard, sticky, plastic; black possible humus
coating on ped faces and along cracks; few
fine tubular and common medium interstitial
pores; many fine roots; very strongly acid (field
pH 4.5); gradual smooth boundary.

 26-42 cm (Btg) Grayish brown (10YR 5/2) clay;
common medium prominent yellowish red
(5YR 4/6) and distinct strong brown (7.5YR 5/8) mottles; strong medium and coarse subangular blocky

structures; very hard, sticky, plastic; common patchy thin cutan on ped faces; few fine tubular pores,
common fine and medium interstitial pores; common very fine roots; very strongly acid (field pH 4.5);
clear, smooth boundary.

 42-65 cm (Btgv1) Gray (10YR 5/1) clay; many medium and coarse prominent dark red (10R 3/6)
and strong brown (7.5YR 5/6) mottles; moderate fine and medium subangular blocky structures;
sticky, plastic; many patchy moderately thick cutan on ped faces; Plinthite (10YR 3/6, red) > 50%
by volume of the soil matrix or continuous phase; few fine tubular and common fine interstitial
pores; few fine roots; very strongly acid (field pH 4.5); clear smooth boundary.

 65+ cm (Btgv2) Gray (10YR 5/1) clay; many medium and coarse prominent dark red (10R 3/6)
mottles; moderate fine and medium subangular blocky structures; sticky, plastic; many patchy
moderately thick cutan on ped faces; Plinthite (10YR 3/6, red) > 50% by volume of the soil
matrix or continuous phase; few medium tubular and common fine interstitial pores; very strongly
acid (field pH 4.5).

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