soil map units where Fh Fahefa soils is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Tongatapu |
| Landscape position | Uplifted and ash-mantled coral surface. |
| Soil parent material | - |
| Slope | Flat |
| Surface outcrops | - |
| Brief soil profile description | 0-40 cm Very dark grey to dark reddish brown friable clay to clay loam;40-150 cm Dark reddish brown; firm clay; soft weathered lapilli often in bands;150-200 cm brown firm clay;on Coral limestone. |
| Soil profile texture | - |
| Minimum effective rooting depth | 200 cm |
| Soil pH (acidity) | Near neutral to moderately alkaline |
| Salinity | - |
| Soil fertility under natural conditions | Very high Base saturation (%), exchangeable calcium (Ca) and magnesium (Mg); exchangeable potassium (K) very high with low values at depth; organic carbon (C) and total nitrogen (N) medium in surface horizons falling to low at depth. phosphorus (P) high to very high. |
| Soil moisture regime | - |
| Susceptibility to drought | Dries out for short periods during dry seasons. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Moderate to rapid permeability and drains readily after periods of heavy rain. |
| Susceptibility to flooding | - |
