Page 137 - E-BOOK English

The representatives of Podzols in Thailand

Albic Podzols

Albic Podzols have a layer of albic or A horizon overlying a light gray or white

material ≥ 1 cm thick, and starting ≤ 100 cm loamy sand or sand E horizon. The spodic or

from the mineral surface soil, that does not Bh horizon has a reddish brown, dark brown,
consist of tephric material, does not contain dark yellowish brown or brown sandy loam or
carbonates, and does not contain gypsum; and loamy sand texture between 50 to 100 cm from

that overlies a diagnostic horizon or forms part the surface soil. Under the spodic horizon is a

of a layer with stagnic properties. yellowish brown or light gray with brownish

Ban Thon series (Bh) is a representative yellow or strong brown mottled loamy sand or
of Albic Podzols. Ban Thon soils are formed sand C horizon (spodic horizon meet within 200

from an old beach or dune on the lower part cm from the surface soil). Soil pH is very strongly
of old beach ridges or dune sand and occurs on acid to moderately acid (pH 5.0-6.0). The major

beach ridges along the coastline. Relief is nearly of constraint is acute nutrient deficiency, aridity
level to gently undulating. Slopes are about 1 in the dry season, and waterlogging in the wet

to 5 percent. These soils are typically found season. Therefore, most cultivated areas have
along coastal zone in peninsular and southeast been abandoned and converted to an area of

coast of Thailand. Drainage is well drained over low secondary shrubs and grasses.
moderately well drained to somewhat poorly

drained. They are moderately deep soils to
cemented spodic materials and characterized by

a black or very dark gray loamy sand surface

135