soil map units where Vm1 Vaimo’unga soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Niuafo’ou |
| Landscape position | Weakly weathered basaltic lavas developed on northwestern, northeastern and southern ledges on inside of caldera. |
| Soil parent material | - |
| Slope | Moderately steep (21-25°) |
| Surface outcrops | - |
| Brief soil profile description | 0-7 cm Black friable loamy sand; 7-17 cm Black friable sand; 17-50 cm brown loose gravelly sand; 50-60 cm Black loose sand; on Parent rock |
| Soil profile texture | - |
| Minimum effective rooting depth | 60 cm (lithic contact) |
| Soil pH (acidity) | Slightly alkaline to moderately alkaline |
| Salinity | - |
| Soil fertility under natural conditions | Medium cation exchange capacity (CEC) in surface; high sodium (Na) and low potassium (K); phosphorus (P) values low; sulphur (S) low at surface but increases with depth. |
| Soil moisture regime | - |
| Susceptibility to drought | - |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | - |
| Susceptibility to flooding | - |
