soil map units where 57V Tiotala steepland soils, very steep phase is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Upolo |
| Landscape position | Soils of the lowlands and foothills - moderately dissected landscapes |
| Soil parent material | from scoria aa of the Mulifanua and Salani Volcanics |
| Slope | Very steep to precipitous (inner slopes of craters) |
| Surface outcrops | Surface very gravelly. No rock outcrops. |
| Brief soil profile description | - |
| Soil profile texture | 4cm slightly peaty silty clay loam. 25cm silty clay. 20cm gravelly loam. on weathered scoria |
| Minimum effective rooting depth | <70cm |
| 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 |
