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Skeletic Acrisols
Skeletic Acrisols have ≥ 40% coarse in the central high land and the north of
fragments averaged over a depth of 100 cm Thailand. They are deep gravelly soils and
from the surface soil or between the mineral characterized by a dark brown or dark
surface soil continuous rock, technic hard reddish-brown gravelly loam or gravelly clay
material, or a cemented or indurated layer, loam A horizon overlying a reddish-brown or
whichever is shallower. yellowish-red grading to red very gravelly clay
Chiang Khan series (Ch) is a representative loam or very gravelly clay argillic B horizon. The
of Skeletic Acrisols. Chiang Khan soils are formed reddish, yellowish, and/or brownish mottles
from residuum and local colluvium derived from occur in the weathering zone, particularly in the
shale and metamorphic rock equivalent to shale lower B horizon. Soil pH is very strongly acid to
and occur on erosional surface and footslops. neutral (pH 4.5-7.0). Land use limitations are
Relief is undulating to hilly which slopes range shallow, low fertility and high soil erosion risk
from 4-20 percent. This soil is typically found on sloping land.
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