Page 35 - E-BOOK English

Haplic Humic Acrisols

Haplic Humic Acrisols have soil organic

carbon ≥ 1% in the fine earth fraction as a weighted
average to a depth of 50 cm from the mineral

surface soil and none of the proceeding qualifiers
applies.

Nong Mot series (Nm) is a representative

of Haplic Humic Acrisols. Nong Mot soils are formed
from residuum and colluvium from granite and

granite derived rocks on the undulating to hilly
terrains. Slopes are about 4-35 percent. These

soils are typically found in the north of Thailand.
Drainage is well drained. Permeability is estimated

to be moderate. Runoff is slow to rapid. They are
very deep and characterized by very dark grayish

brown or dark brown loam or clay loam A horizon
overlying a reddish-brown or yellowish red to red

clay or sandy clay argillic B horizon. Soil pH is very
strongly to moderately acid (pH 4.5-6.0). Land use

limitations are low fertility and high soil erosion risk
on sloping land.

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