Page 114 - E-BOOK English

Soil classification

WRB: Gleyic Luvisols
Soil taxonomy: Fine, mixed, active, isohyperthermic Aeric Endoaqualfs

Soil series: Nakhon Pathom series (Np)

Profile description

 0-15 cm (Apg1) Very dark grayish brown
(10YR 3/2) clay loam; many fine and medium
yellowish red mottles; moderately fine
subangular blocky structure; friable moist;
slightly sticky, nonplastic; many very fine
interstitial and common very fine tubular pores;
many very fine root; moderately acid (field pH
6.0); clear, smooth boundary.

 15-31 cm (Apg2) Very dark grayish brown
(10YR 3/2) clay loam to light clay; few fine brown
to dark brown mottles; weak to moderate medium
subangular blocky structures; many very fine
interstitial and tubular pores; few pieces of brick;
common very fine roots; gradual, smooth
boundary; neutral (field pH 7.0); gradual, smooth
boundary.
 31-50 cm (Btg1) Dark grayish brown (10YR 4/2)
clay; many fine and medium dark yellowish
brown mottles; moderate to strong medium
subangular blocky breaking to small blocks;
friable moist; sticky, slightly plastic; patchy thin
clay coatings; many very fine interstitial and
tubular pores; few small soft manganese
nodules; common very fine roots; neutral (field
pH 7.0); gradual, smooth boundary.

 50-85 cm (Btg2) Dark grayish brown (10YR 4/2)
to brown (10YR 4/3) clay; many fine and medium dark yellowish brown and yellowish brown mottles;
clay; moderate to strong, medium subangular blocky, breaking to small blocks; friable moist, sticky,
slightly plastic; thin broken clay coatings on ped faces and in pores; many very fine interstitial and
tubular pores; few small soft manganese nodules; common very fine roots; moderately alkaline (field
pH 8.0); gradual, smooth boundary.

 85-105+ cm (Btg3) Brown to dark brown (7.5YR 4/2) light clay; very many medium yellowish brown
mottles; moderate to strong medium subangular blocky structures; sticky, slightly plastic; thin
broken clay coatings; many very fine interstitial and tubular pores; few very small soft manganese
nodules; few very fine roots; moderately alkaline (field pH 8.0) (slightly calcareous).
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