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Stagnic Plinthosols
Stagnic Plinthosols have a layer ≥ 25 is estimated to be slow. They are very deep soils
cm thick, and starting ≤ 75 cm from the mineral and characterized by a yellowish brown, grayish
surface soil with stagnic properties in which the brown or gray clay loam surface or A horizon
area of reductimorphic colours plus the area of overlying a gray or light gray clay subsurface
oximorphic colours is ≥ 25% of the total area, horizon which in turn overlies a gray or light gray
and reducing conditions for some time during clay argillic B horizon. These soils are mottled
the year in the major part of the soil volume throughout with common and many fine and
that has the reductimorphic colours. medium strong brown and yellowish brown at
Klaeng series (Kl) is a representative the surface, common medium yellowish brown,
of Stagnic Plinthosols. Klaeng soils are formed strong brown with yellowish red and red in the
from alluvium on alluvial plain. Relief is level subsurface and dominant red or dusky red in
to nearly level. Slope is 0 to 2 percent. These the subsoil within 150 cm from the surface soil.
soils occupy moderate extent in peninsular and Soil pH is very strongly acid to moderately acid
southeast coastal of Thailand. Drainage is poorly (pH 4.5-6.0). Land use limitation is low fertility.
drained, permeability is slow and surface runoff
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