17 - Pakowhai
Soil Properties
| Parent material |
Water deposit (alluvium) from greywacke and/or sandstone and limestone |
| Characteristic site and soil features |
Active flood plain which is protected from flooding by the stopbanks; sandy or silty sediment overlying buried topsoils of older 14,15, or 19 .Often with lime deposits |
| Associated soils not shown within map unit at map scale but separated out in more detailed maps. - Sample Location |
18, 14
I, J |
| Natural drainage and depth to gley and hence to water table after wet periods |
Imperfect
30-60cm |
| Potential rooting depth, texture, and limiting layer |
17 30-45cm sandy loam/silt loam on slowly
permeable layer
(old topsoil)
17s 30-60cm sand on sandy loam/silt loam on
old topsoil |
| Available water capacity |
17 30-50mm
17s 20-50mm |
| Infiltration rate |
17 moderate
17s rapid
|
| Permeability rate |
17 slow
17s moderate to slow |
| Susceptibility of topsoil to pugging and compaction |
17 high
17s low |
| Susceptibility to wind erosion when dry |
17s very high |
| Unfavourable soil characteristics |
17 perched gley on a slowly permeable buried
topsoil at 30-45 cm in Pakowhai area have
high pH (alkaline) magnesium deficiency
17s sand topsoil susceptible to wind erosion
perched gley on slowly permeable layer at
30-60cm rapid infiltration |
Soil Management
| Artificial drainage: drain spacing |
17 40m
17s 20-40m |
|
Cultivate when moist to avoid:
compaction
wind erosion
|
17
17s |
Irrigation:-
Recommended method
Dripper spacing for continuous wetted strip
Amount and frequency |
17 sprinkler to prevent waterlogging
if 4 l/hr drippers used
17 40cm
17s 30cm
17 little (15-25mm), often to prevent waterlogging
17s little (10-15mm), often to prevent waterlogging |
Pakowhai soil (17,17s) (photo J. Watt)