soil map units where 68a Luatuanu' clay eroded phase is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Upolo |
| 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 | Rolling slopes |
| Surface outcrops | Surface usually rocky in places |
| Brief soil profile description | - |
| Soil profile texture | 5cm clay. 25cm stony clay. on soft weathering rock |
| Minimum effective rooting depth | <30cm |
| Soil pH (acidity) | Strongly acid (pH = 5.1) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Very low fertility. Base saturation 12% in topsoil and 5% in subsoil. Exchangeable potassium (K) low to moderate, available potassium (P) low. |
| Soil moisture regime | Without dry season (Perudic moisture regime) |
| Susceptibility to drought | Weak to very weak dry season (1-2 months <100mm rainfall). Rainfall 3000mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
