32 - Poporangi - Dominant Soil @ Map Scale 1:50000
| Associated Soil/s |
73, 74, 29 may also be found within these areas (32, 32g) if a more detailed survey was carried out. |
| Soil Properties of Dominant Soil/s |
|
| Parent material |
Mostly alluvium from loess and some volcanic ash but also includes stony alluvium derived from erosion of Castlecliffian deposits |
| Characteristics of site |
Watercourses and depressions on intermediate terrace |
| Soil features |
Sandy loam/silt loam over cemented pan on stones |
Natural drainage
Depth to perched gley |
Imperfect
Water perched at 30-60 cm on pan |
| Potential rooting depth, texture, and limiting layer |
32 – 30-45 cm sandy loam/silt loam on gleyed sandy loam
on cemented pan at 45-60 cm
32g – 30-35 cm sandy loam on thin gleyed sandy loam on stones with pan underneath |
| Available water capacity |
32 – 50-75 mm
32g – 25-40 mm |
| Infiltration rate |
Moderate |
| Permeability rate |
Very slow |
| Susceptibility to pugging and compaction when wet |
High |
| Susceptibility to wind erosion when dry |
High |
| Unfavourable soil characteristics |
Imperfect drainage, water perched on pan
Very slow permeability
32g – low AWC
Topsoil susceptible to compaction and wind erosion |
Soil Management of Dominant Soil/s
| Artificial drainage |
Mole drains above pan |
|
Cultivate when moist to avoid:
Compaction
Wind erosion
|
32
32 |
Irrigation:-
Recommended method
Dripper spacing for continuous wetted strip
Amount and frequency |
Sprinkler to prevent water logging
If 4 l/hr drippers used
32 – 40 cm
32g – 30 cm
15-25 mm often to prevent waterlogging |
Poporangi (32,32g) (photo K. Vincent)