soil map units where 2A Tiri is dominant
Soil properties
| Property | Value |
|---|---|
| Geographic distribution | All islands |
| Landscape position | Marine marshes in the lowlands and foothills |
| Soil parent material | estuarine alluvium |
| Slope | Flat to near level (0-1°). Uneven microrelief due to reclamation and drainage works. |
| Surface outcrops | No surface rock outcrops. No surface stones or boulders. |
| Brief soil profile description | - |
| Soil profile texture | 0-32cm humic clay loam. 32-108cm peaty silt loam. 108-135cm+ silt loam. |
| Minimum effective rooting depth | <30cm. Low subsoil nutrient status and high salinity. |
| Soil pH (acidity) | 0-32cm strongly acid. 32-108cm extremely acid. 108-135cm near neutral. |
| Salinity | Strongly saline. |
| Soil fertility under natural conditions | Potassium (K) very low 32-108cm. |
| Soil moisture regime | aquic |
| Susceptibility to drought | Soil moisture deficits are never experienced. |
| Soil drainage | Very poorly drained. |
| Susceptibility to waterlogging | In normal years and due to drainage water table maintained at about 60cm. Can experience short duration waterlogging to the surface during flood and spring tide events. |
| Susceptibility to flooding | Artificially drained. Water table still affected by tidal fluctuations. In normal years would suffer 5-6 floods, each lying for 2-3 days sometime in the period November to April. |
