Table 2.6 Local soil types with their slope position and properties, plus their quality changes over time, in Chieng Khoi commune, north-west Vietnam
Soil name
Typical
position
on slope
Amount
of stone
(%)
Type of stone
Hardness
level
Water
infiltration
level
Water content
in dry season
Erosion
hazard level
Soil quality
change
Black soil Black soil
in the
forest
>50
Limestone
Soft
High
Low
Low
No info
Good black
soil
25–50 (0) Conglomerate
Soft
High
Low
Medium
Better on the
plain;
poorer on
the crest
Sandy
black
soil
<10
Conglomerate,
Clay stone
Soft
Medium
High
High
No change;
poorer
after heavy
rain
Black soil
mixing
gravel
~50
Clay stone,
Quartz gravel
Medium
(rocks)
Medium
High
Medium
Poorer
Black soil
mixing
rock
~50
Conglomerate
Medium
(rocks)
High
Medium
Low (rock)
No change
Red soil
Red soil
~10
Silt stone
Hard
High
Low
Medium
Poorer
68
K. Stahr et al.