29 A'ana stony silty clay

soil map units where 29 A'ana stony silty clay is dominant

Soil properties

Property Value
Geographic distribution Samoa
Landscape position Soils of the lowlands and foothills - slightly dissected landscapes
Soil parent material from mixed aa and pahoehoe basalt of the Mulifanua Volcanics
Slope Easy rolling slopes
Surface outcrops Surface stony. No rock outcrops.
Brief soil profile description -
Soil profile texture 18cm stony clay. 33cm stony clay. on bouldery clay boulders >70cm
Minimum effective rooting depth <70cm. Note boulders.
Soil pH (acidity) Slightly acid (pH = pH = 6.5)
Salinity Non saline
Soil fertility under natural conditions Fertile. Base saturation 80-100%. High exchangeable potassium (K). Soil humus source of K.
Soil moisture regime With weak to strong dry season (Udic moisture regime)
Susceptibility to drought Weak dry season (1-2 months <60mm rainfall). Rainfall 2875-3250mm.
Soil drainage Well drained
Susceptibility to waterlogging Perched water table during wet season.
Susceptibility to flooding Never floods

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