soil map units where Vp Vaipoa soils (Vp) is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Niuatoputapu |
| Landscape position | Varying mix of volcanics and coral sand form on lower terrace on colluvium from top ridge and upper terrace. |
| Soil parent material | - |
| Slope | Rolling (12-15°) |
| Surface outcrops | - |
| Brief soil profile description | 0-10 cm Black friable sandy clay loam; 10-25 cm Dark yellowish brown very firm clay loam; on 25 cm+ consolidated limestone |
| Soil profile texture | - |
| Minimum effective rooting depth | 25 cm (lithic contact) |
| Soil pH (acidity) | Near neutral to slightly alkaline |
| Salinity | - |
| Soil fertility under natural conditions | Organic carbon (C) and nitrogen (N) values low; total phosphorus (P) and phosphorus (P) very high; sulphur (S) medium; Base saturation (%) and calcium (Ca) very high; potassium (K)high and sodium (Na) medium. |
| Soil moisture regime | - |
| Susceptibility to drought | - |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | - |
| Susceptibility to flooding | - |
