soil map units where 23H Vaisala hill soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Savaii |
| Landscape position | Soils of the lowlands and foothills - slightly dissected landscapes |
| Soil parent material | from aa and pahoehoe basalt and scoria of the Mulifanua Volcanics |
| Slope | Strongly rolling to moderately steep slopes |
| Surface outcrops | Surface covered with loose rubble. |
| Brief soil profile description | - |
| Soil profile texture | 50cm stony silty clay loam. 20cm stony silty clay. on boulders |
| Minimum effective rooting depth | <75cm |
| Soil pH (acidity) | Slightly acid (pH = pH = 6.5) |
| Salinity | Non saline |
| Soil fertility under natural conditions | High fertility. Base saturation 100%. High organic calcium (C), calcium (Ca) and magnesium (Mg) values, moderate for exchangeable potassium (K). |
| Soil moisture regime | With weak to strong dry season (Udic moisture regime) |
| Susceptibility to drought | Moderate to strong dry season (3 months <100mm rainfall). Rainfall 2250-3000mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
