soil map units where 29b A'ana bouldery silty clay 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 gently rolling slopes |
| Surface outcrops | No rock outcrops. Surface stony and occasionally bouldery. |
| Brief soil profile description | - |
| Soil profile texture | 15cm clay. 30cm bouldery clay. on very bouldery clay |
| Minimum effective rooting depth | <40cm. Often flat lava sheets. |
| Soil pH (acidity) | Slightly acid (pH = pH = 6.5) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Fertile. Base saturation 80-100%. High exchangeable potassium (K). Soil humus source of K. |
| Soil moisture regime | With weak to strong dry season (Udic moisture regime) |
| Susceptibility to drought | Weak dry season (1-2 months <60mm rainfall). Rainfall 2875-3250mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Perched water during wet season. |
| Susceptibility to flooding | Never floods |
