soil map units where Na Nuku’alofa soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | ‘Eua, Tongatapu |
| Landscape position | Beach ridge. |
| Soil parent material | - |
| Slope | Flat to gently undulating (0-3°). |
| Surface outcrops | - |
| Brief soil profile description | 0-17 cm Black coarse sand; 17-50 cm Yellowish brown coarse sand; on Coral limestone. |
| Soil profile texture | - |
| Minimum effective rooting depth | 50 cm |
| Soil pH (acidity) | Moderately alkaline |
| Salinity | - |
| Soil fertility under natural conditions | High in organic carbon (C) and nitrogen (N) in A horizons; phosphorus (P) high to very high. |
| Soil moisture regime | - |
| Susceptibility to drought | Dries out in dry periods. |
| Soil drainage | Excessively drained |
| Susceptibility to waterlogging | - |
| Susceptibility to flooding | - |
