soil map units where Tm Tongamama soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Niuafo’ou |
| Landscape position | Basaltic ash merging with lava flows on the east and southeast side of the island. |
| Soil parent material | - |
| Slope | Flat to undulating (0-5°) |
| Surface outcrops | - |
| Brief soil profile description | 0-10 cm Black friable sandy loam; 10-50 cm Very dark brown friable to firm sandy loam; 50-60 cm Yellowish red, loose loamy sand; on Parent rock. |
| Soil profile texture | - |
| Minimum effective rooting depth | 60 cm (lithic contact) |
| Soil pH (acidity) | Slightly acid |
| Salinity | - |
| Soil fertility under natural conditions | High base status; potassium (K) values decrease with depth; total phosphorus (P) high; sulphur (S) values low in topsoil, increasing with depth. Amorphous materials. |
| Soil moisture regime | - |
| Susceptibility to drought | - |
| Soil drainage | Somewhat excessively drained |
| Susceptibility to waterlogging | Never Waterlogs |
| Susceptibility to flooding | Never Floods |
