Page 143 - E-BOOK English

The representatives of Solonchaks in Thailand

Gleyic Solonchaks

Gleyic Solonchaks have a layer ≥ 25 ors. They contain large quantity of soluble salts.
cm thick, and starting ≤ 75 cm from the mineral The white salt crust at the surface in the dry

surface soil, that has gleyic properties throughout season is a main diagnostic feature for these soils.
and reducing conditions in some parts of every Reaction is slightly acid to moderately alkaline

sublayer. (pH 5.0-6.5). Land use in areas where high salt

Udon series (Ud) is a representative accumulation is at the surface soil must have a
of Gleyic Solonchaks. Udon soils are formed suitable cultural practice before the cultivation

from wash deposit and occur on the lower part of main crops to slow down the salt transport,

of peneplain. Relief is nearly level to gently which enhances crop growth. Also, other salt-tol-
undulating which slopes range from 1 to 3 erant crops may be grown for household and
percent. These soils are found in the northeast community benefits.

of Thailand. Drainage is somewhat poorly

drained. They are deep, stratified soils and
are characterized by a light brown, brown or
grayish brown loamy sand or sandy loam A

horizon overlying variable colour and texture, but

mainly are pinkish gray, light brownish gray
or gray sandy clay loam, sandy clay or clay
alternating with sandy loam or loamy sand B and

C horizons. These soils are mottled throughout

the profile with brownish and/or yellowish col-

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