soil map units where Hi Hihifo soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Niuatoputapu |
| Landscape position | Colluvium (from ridge and upper terrace) occupying a belt concentric to Vaipoa and Tu’avao soils. |
| Soil parent material | - |
| Slope | Undulating (4-7°) to easy rolling (8-11°). |
| Surface outcrops | - |
| Brief soil profile description | 0-40 cm Very dark brown friable sandy clay loam; 40-75 cm Dark reddish brown friable clay loam with weathered lapilli; 75-90 cm Yellowish red sticky clay loam with weathered lapilli. |
| Soil profile texture | - |
| Minimum effective rooting depth | 90 cm |
| Soil pH (acidity) | Near neutral |
| Salinity | - |
| Soil fertility under natural conditions | Organic carbon (C) and nitrogen (N) values low; sulphur (S) values 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 | - |
