soil map units where 109H Roroa is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Rotuma |
| Landscape position | Young volcanic hill country in the lowlands and foothills |
| Soil parent material | basaltic tuffaceous cones |
| Slope | Very steep (36-40°). Uneven microrelief. |
| Surface outcrops | No surface rock outcrops. Few surface stones. |
| Brief soil profile description | - |
| Soil profile texture | 0-16cm gravelly loamy very coarse sand. 23-60cm very coarse sand. On indurated tuff. |
| Minimum effective rooting depth | <60cm. Cemented tuff between 60-100cm. |
| Soil pH (acidity) | Slightly acid. |
| Salinity | Non saline. |
| Soil fertility under natural conditions | Phosphorus (P) and potassium (K) very low. |
| Soil moisture regime | udic/perudic |
| Susceptibility to drought | In normal years soil moisture deficits are never experienced. |
| Soil drainage | Well drained. |
| Susceptibility to waterlogging | Never waterlogs. |
| Susceptibility to flooding | Never floods. |
