soil map units where 85 Tiavi silty clay loam is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Samoa |
| Landscape position | Soils of the uplands - moderately dissected landscapes |
| Soil parent material | from mixed aa and pahoehoe basalt of the Salani Volcanics |
| Slope | Undulating to rolling slopes |
| Surface outcrops | Surface locally bouldery. No rock outcrops. |
| Brief soil profile description | - |
| Soil profile texture | 8cm stony silty clay loam. 30cm silty clay. 23cm gravelly to stony silty clay. on stones and boulders |
| Minimum effective rooting depth | 90cm |
| Soil pH (acidity) | Strongly acid (pH = 4.5) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Low fertility. Base saturation 13% in topsoil, nil below. Exchangeable potassium (K) and organic calcium (C) high in topsoil, low below. |
| Soil moisture regime | Without dry season (Perudic moisture regime) |
| Susceptibility to drought | No dry months. Rainfall 4375-6250mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
