40 - Kopua - Dominant Soil @ Map Scale 1:50000
| Associated Soil/s |
39 may also be found within this area (40) if a more detailed survey was carried out. |
| Soil Properties of Dominant Soil/s |
|
| Parent material |
Tongariro alluvium from volcanic ash mixed with a little greywacke |
| Characteristics of site |
Gently sloping intermediate terrace |
| Soil features |
Ash on red metal |
Natural drainage
Depth to water table after wet periods |
Good
>10 m |
| Potential rooting depth, texture, and limiting layer |
30-45 cm ash on stones |
| Available water capacity |
25-50 mm |
| Infiltration rate |
Very rapid
|
| Permeability rate |
Very rapid |
| Susceptibility to pugging and compaction when wet |
Very low |
| Susceptibility to wind erosion when dry |
Extremely high |
| Unfavourable soil characteristics |
Low AWC
Very rapid infiltration
Very rapid permeability
Topsoil easily eroded by wind
Low fertility - high phosphate retention (high allophane) |
Soil Management of Dominant Soil/s
| Artificial drainage |
N/A |
|
Cultivate when moist to avoid wind erosion
|
40 |
Irrigation:-
Recommended method
Dripper spacing for continuous wetted strip
Amount and frequency |
Sprinkler to prevent water loss
30 cm if 4 l/hr drippers used
15-25 mm often to prevent water loss |
Kopua (40) (photo K. Vincent)