soil map units where 46b Tafatafa bouldery silty clay loam is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Upolo |
| 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 | Undulating to rolling slopes |
| Surface outcrops | Surface very bouldery with many outcrops of pahoehoe blocks |
| Brief soil profile description | - |
| Soil profile texture | 10cm silty clay loam. 25cm silty clay. on rock |
| Minimum effective rooting depth | <40cm |
| Soil pH (acidity) | Moderately acid (pH = 5.8) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Moderate fertility. Base saturation 50%. High organic calcium (C) and exchangeable potassium (K) in topsoils, low in subsoil. Available phosphorus (P) low |
| Soil moisture regime | Without dry season (Perudic moisture regime) |
| Susceptibility to drought | Very weak dry season (1 month <100mm rainfall). Rainfall 3250-4375mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
