Page 119 - E-BOOK English

Skeletic Luvisols

Skeletic Luvisols have a coarse fragment ≥ 40% (by

volume) averaged over a depth of 100 cm from the surface soil
or to continuous rock, technic hard material or a cemented or

indurated layer, whichever is shallower.

Tha Li series (Tl) is a representative of Skeletic
Luvisols. Tha Li soils are formed from residuum and colluvium

from andesite and equivalent igneous rocks and occur on
(dissected) erosional surface and footslope. These soils typically

occupy moderate extent in Central Highlands. Relief is undulating
to hilly which slopes range from 3-20 percent. Drainage is

well drained. Permeability is moderate. Surface runoff is rapid.
They are gravelly, shallow soils, and characterized by a very

dark grayish brown, dark reddish brown (gravelly) loam or clay
loam A horizon overlying a reddish brown or yellowish red

very gravelly clay loam or very gravelly clay argillic B horizon.
Weathered and/or partly weathered rock fragments usually

occur throughout the profile, increasing with depth. The C horizon
occurs at some deep below 80 cm. Reaction is very strongly

acid to neutral (pH 5.0-7.0). Land use limitation are shallow soil
to rock fragment and high risk of erosion on sloping area.

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