soil map units where So2 Sopu soils, peaty sandy loam is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Tongatapu |
| Landscape position | Coastal and lagoonal swamps. |
| Soil parent material | - |
| Slope | Flat |
| Surface outcrops | - |
| Brief soil profile description | 0-20 cm Black peaty friable sandy loam; 20-30 cm Pale olive friable sandy loam; 30-50 cm Greenish grey sandy loam; on Hard coral limestone. |
| Soil profile texture | - |
| Minimum effective rooting depth | 50 cm |
| Soil pH (acidity) | Strong to extremely acid |
| Salinity | Strongly saline |
| Soil fertility under natural conditions | Medium exchangeable calcium (Ca), magnesium (Mg) and potassium (K) dropping to low with depth. |
| Soil moisture regime | - |
| Susceptibility to drought | - |
| Soil drainage | Poorly drained |
| Susceptibility to waterlogging | Poor drainage |
| Susceptibility to flooding | High saline water table |
