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The representatives of Histosols in Thailand

Fibric Histosols

Fibric Histosols have organic materials moderate and surface runoff is slow. They are

consisting of recognizable plant tissues, very deep organic soil materials, more than 100
two-thirds or more (by volume) within 100 cm cm depth from the surface soil, fibric material

of the surface soil. with soil reaction less than 4.5 (extremely acid)

Narathiwat series (Nw) is a representative throughout the profile. In lower parts of organic

of Fibric Histosols. Narathiwat soils are materials inorganic soils have high sulphur
organic soil materials and occurred on the content (sulfidic soil materials). These soils have
swampy areas along the coastal region. very low fertility, acute nutrient deficiency, and

Commonly, swampy areas occur between extremely acid. Some area still remains under

sand bar or sand dune. Slope is less than 1 freshwater swamp. Many parts have been used
percent. They are found in peninsular Thailand for agriculture, however production is not
and some areas in Southeast Coast of Thailand. economically viable.

Drainage is very poor. Permeability is slow to

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