Page 31 - World Reference Base for Soil Resources of Thailand
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Land Development Department Library
Gleyic Acrisols
Gleyic Acrisols have gleyic properties, a layer
of ≥ 25 cm thick and start at the depth of ≤ 40 cm
from the mineral surface. Besides, these soils have
reducing conditions in some parts of every sublayer.
Hin Kong series (Hk) is a representative of
Gleyic Acrisols. Hin Kong series are formed from alluvium
and occur on low terraces of the alluvial plain. Relief
is flat to nearly flat with a micro-relief. Slopes are
about 0-2 percent. They moderately occupy on the
eastern margins of the Central Plain. Drainage is
somewhat poorly drained to poorly drained. They are
deep and characterized by a pale brown or brown
silt loam A horizon, overlying a pale brown, grading
to pinkish-gray silt loam or silty clay loam argillic B
horizon. Soil pH is strongly to moderately acidic soils
(pH 5.0-6.0). In the lower B horizon, reddish mottles
commonly occur and black manganese coatings in
pores or as nodules are found in the argillic B hori-
zon. Soil pH is very strongly to strongly acidic soils
(pH 5.0-5.5). Land use limitations are 30 cm flooding
depth over a period of 3-4 months per year, low
fertility, and poor soil physical properties.
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