soil map units where So1 Sopu soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Tongatapu |
| Landscape position | Low lying coastal and lagoonal swamps. |
| Soil parent material | - |
| Slope | Flat |
| Surface outcrops | - |
| Brief soil profile description | 0-40 cm Black peat; 40-50 cm Dark grey sand;on Coral limestone or beach rock. |
| Soil profile texture | - |
| Minimum effective rooting depth | 50 cm |
| Soil pH (acidity) | Strongly alkaline |
| Salinity | Saline |
| Soil fertility under natural conditions | High organic carbon (C) and total nitrogen (N). Topsoil phosphorus (P) values medium. |
| Soil moisture regime | - |
| Susceptibility to drought | - |
| Soil drainage | Imperfectly to poorly drained |
| Susceptibility to waterlogging | Poor drainage |
| Susceptibility to flooding | Flooding by saline waters. |
