soil map units where 57S Tiotala steepland soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Samoa |
| Landscape position | Soils of the lowlands and foothills - moderately dissected landscapes |
| Soil parent material | from scoria aa of the Mulifanua and Salani Volcanics |
| Slope | Moderately steep to steep slopes |
| Surface outcrops | Surface free of boulders and stones. No rock outcrops. |
| Brief soil profile description | - |
| Soil profile texture | 5cm gritty peaty silt loam. 75cm silty clay loam. on weathering scoria |
| Minimum effective rooting depth | <90cm |
| Soil pH (acidity) | Moderately acid (pH = 5.5) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Moderate to low fertility. Base saturation 40% in topsoil and nil below. Exchangeable potassium (K) and organic calcium (C) high in topsoil, low subsoil. |
| Soil moisture regime | Without dry season (Perudic moisture regime) |
| Susceptibility to drought | No dry season. Rainfall 3750-5000mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
