soil map units where 3a Fusi shallow grey sand over basalt is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | Samoa |
| Landscape position | Soils of the coastlands, valley floors and their margins |
| Soil parent material | from calcerous sand |
| Slope | Flattish to slightly undulating |
| Surface outcrops | Areas of bare basalt rock. Surface not stony. |
| Brief soil profile description | - |
| Soil profile texture | 15cm medium to find sand. 25cm medium and coarse sand. on unweathered pahoehoe lava |
| Minimum effective rooting depth | <50cm |
| Soil pH (acidity) | Topsoil neutral (pH = pH = 6.7). Subsoil moderately alkaline (pH = pH = 7.8). |
| Salinity | Exchangeable sodium (Na) high (3%) |
| Soil fertility under natural conditions | Moderate to high fertility. Exchangeable potassium (K), magnesium (Mg) and calcium (Ca) very high values. Available phosphorus (P) moderate high in topsoil. |
| Soil moisture regime | - |
| Susceptibility to drought | Weak to moderate dry season (2-3 dry months <100mm rainfall). Rainfall 2250-2500mm. |
| Soil drainage | Well drained |
| Susceptibility to waterlogging | Never waterlogs |
| Susceptibility to flooding | Never floods |
