Page 129 - E-BOOK English

Soil classification

WRB: Pisoplinthic Plinthosols
Soil taxonomy: Loamy-skeletal over clayey, kaolinitic, isohyperthermic Typic (Oxyaquic Plinthic) Paleustults

Soil series: Phon Phisai series (Pp)

Profile description

 0-5 cm (A) Dark grayish brown (10YR 4/2)
sandy loam; many fine and medium distinct
strong brown (7.5YR 4/6) mottles; moderate

granular structure; friable, nonsticky,
nonplastic; many fine roots; slightly acid

(field pH 6.5); abrupt, smooth boundary.

 5-22 cm (BA) Pale brown (10YR 6/3) loam;

common fine and medium distinct strong brown
(7.5YR 5/6) mottles; friable, slightly sticky,

slightly plastic; common fine and few medium
roots; very strongly acid (field pH 5.0); gradual,

smooth boundary.

 22-78 cm (Btcv) Very pale brown (10YR 7/3)
very gravelly clay; many coarse prominent

red (2.5YR 4/6) mottles; friable, sticky, plastic;
continuous moderately thick clay coating on

ped faces; few fine roots; gravels are hard
ironstone nodules which make up about 50

percent of the horizon; very strongly acid (field pH 5.0); gradual, smooth boundary.

 78-110 cm (Btv) White (10YR 8/1) slightly gravelly clay; many fine and medium prominent red

(2.5YR 4/8) mottles; firm, sticky, plastic; continuous moderately thick clay coating on ped
faces; gravels are hard ironstone nodules which make up 5-10 percent of the horizon; very
strongly acid (field pH 5.0); gradual, smooth boundary.

 110-160 cm (BCv) White (10YR 8/1) clay; many medium and coarse prominent red (10R 4/8)
and few fine distinct yellowish red (5YR 4/8) mottles; firm, sticky, plastic; very strongly acid

(field pH 5.0).

127