Vm1 Vaimo’unga soils

soil map units where Vm1 Vaimo’unga soils is dominant

Soil properties

Property Value
Geographic distribution Niuafo’ou
Landscape position Weakly weathered basaltic lavas developed on northwestern, northeastern and southern ledges on inside of caldera.
Soil parent material
Slope Moderately steep (21-25°)
Surface outcrops
Brief soil profile description 0-7 cm Black friable loamy sand; 7-17 cm Black friable sand; 17-50 cm brown loose gravelly sand; 50-60 cm Black loose sand; on Parent rock
Soil profile texture
Minimum effective rooting depth 60 cm (lithic contact)
Soil pH (acidity) Slightly alkaline to moderately alkaline
Salinity
Soil fertility under natural conditions Medium cation exchange capacity (CEC) in surface; high sodium (Na) and low potassium (K); phosphorus (P) values low; sulphur (S) low at surface but increases with depth.
Soil moisture regime
Susceptibility to drought
Soil drainage Well drained
Susceptibility to waterlogging
Susceptibility to flooding

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