soil map units where N1 Nomuka soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Ha’apai |
| Landscape position | Young ash on slopes in the centre of Nomuka Island. |
| Soil parent material | - |
| Slope | Gently undulating (3°) slopes |
| Surface outcrops | - |
| Brief soil profile description | 0-15 cm Dark reddish brown friable clay; 15-70 cm Dark reddish brown firm to friable clay with lapilli; on Older ash at 100 cm. |
| Soil profile texture | - |
| Minimum effective rooting depth | 100 cm |
| Soil pH (acidity) | Slightly acid |
| Salinity | - |
| Soil fertility under natural conditions | Organic carbon (C) and nitrogen (N) values are low to medium in topsoil; phosphorus (P) low and phosphorus (P) retention are high to medium; Base saturation (%) and cation exchange capacity (CEC) values high; sulphur (S) low. |
| Soil moisture regime | - |
| Susceptibility to drought | - |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | - |
| Susceptibility to flooding | - |
