soil map units where 47H Aleisa 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 mixed aa and pahoehoe basalt of the Mulifanua Volcanics |
| Slope | Moderately steep to strongly rolling slopes |
| Surface outcrops | Surface stony and bouldery. No rock outcrops. |
| Brief soil profile description | - |
| Soil profile texture | 15cm bouldery clay loam. 15cm bouldery and stony silty clay. 8cm very bouldery silty clay. on pahoehoe and aa lava |
| Minimum effective rooting depth | <40cm |
| Soil pH (acidity) | Slightly acid (pH = 6.3) |
| Salinity | Non saline |
| Soil fertility under natural conditions | Moderately fertile. BS 70%. Base saturation, organic carbon (C) and exchangeable potassium (K) values high in topsoil but low in subsoil. |
| 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 |
