soil map units where 41H Tanumalala 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 always bouldery and stony. No rock outcrops. |
| Brief soil profile description | - |
| Soil profile texture | 13cm bouldery clay. 23cm very bouldery clay. on boulders of vesicular aa |
| Minimum effective rooting depth | <50cm |
| Soil pH (acidity) | Slightly acid (pH = 6.2) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Moderate fertility. Base saturation 50-80%. Base saturation, organic carbon (C) and exchangeable potassium (K) values high. |
| Soil moisture regime | Without dry season (Perudic moisture regime) |
| Susceptibility to drought | Very weak dry season (1 month <100mm rainfall). Rainfall 3250-4375mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
