soil map units where 69S Upolu steepland soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Samoa |
| Landscape position | Soils of the lowlands and foothills - strongly dissected landscapes |
| Soil parent material | from pahoehoe, aa, scoria and dykes of basalt of basalt of the Fagaloa Volcanics |
| Slope | Steep slopes |
| Surface outcrops | Surface very rocky or bouldery. No rock outcrops. |
| Brief soil profile description | - |
| Soil profile texture | 20cm bouldery clay. 60cm very bouldery and rocky clay. on weathered rocks and boulders |
| Minimum effective rooting depth | <80cm |
| Soil pH (acidity) | Moderately acid (pH = 5.4) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Low to moderate fertility. Base saturation 20-30%. Base saturation, organic carbon (C) and exchangeable potassium (K) values high in topsoil and low in subsoil. Low available phosphorus (P). |
| Soil moisture regime | Without dry season (Perudic moisture regime) |
| Susceptibility to drought | No dry season. Rainfall 4000-5000+mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
