soil map units where 42H Atua hill soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Samoa |
| Landscape position | Soils of the lowlands and foothills - slightly dissected landscapes |
| Soil parent material | from aa, scoria and pahoehoe basalt of the Le Faga Volcanics |
| Slope | Moderately steep slopes |
| Surface outcrops | Surface very bouldery. No rock outcrops. |
| Brief soil profile description | - |
| Soil profile texture | 10cm peaty bouldery loam. 28cm bouldery clay loam. on slightly weathered pahoehoe and aa lava |
| Minimum effective rooting depth | <40cm |
| Soil pH (acidity) | Moderately acid (pH = 5.7) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Moderately fertile. Base saturation 70-80% in topsoil, only 3% in subsoil. Plant nutrients contained in the humus. |
| Soil moisture regime | Without dry season (Perudic moisture regime) |
| Susceptibility to drought | No dry season. Rainfall >5000mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
