soil map units where 18H Aopo hill soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Savaii |
| Landscape position | Soils of the lowlands and foothills - very slightly dissected landscapes |
| Soil parent material | from mixed pahoehoe and aa basalt of the Aopo Volcanics |
| Slope | Moderately steep to strongly rolling slopes |
| Surface outcrops | Rugged surface. No rock outcrops. |
| Brief soil profile description | - |
| Soil profile texture | 6cm (peaty) coarse sandy loam. 10cm very stony sandy loam. on aa lava |
| Minimum effective rooting depth | <20cm |
| Soil pH (acidity) | Slightly acid (pH = pH = 6.2) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Moderately fertile. Base saturation 39% in topsoil, 50% in subsoil. Base saturation, organic carbon (C) and exchangeable potassium (K) high in topsoils. |
| Soil moisture regime | With weak to strong dry season (Udic moisture regime) |
| Susceptibility to drought | Weak dry season (1-2 months <100cm rainfall). Rainfall 3250-4500mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
