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Wal Wal Series

The soil series is characterised by having a sporadically bleached A2 ‘subsurface' horizon, followed by grey to yellowish grey subsoil. In the present survey, this series consists of the following soil type:

Wal Wal Clay (WWc)

Profile Morphology:

Surface Soil (A1 horizon)

  • 5-10 cm thick.
  • Dark reddish grey to brown or dark greyish brown.
  • Medium to heavy clay.
  • Very hard to extremely hard (dry), non-friable (moist), plastic and sticky (wet).

Sub-Surface Soil (A2 horizon)
  • 3-10 cm thick.
  • Reddish grey to yellowish brown with a sporadic bleach. Bleaching may occur (in nests only) at the interface between the A and B horizons.
  • Soil texture and consistence are usually similar to those of the A1 horizon.

Subsoil
  • Greyish brown to reddish brown, changing gradually to pale brown or light reddish brown with depth. Slight colour mottling may occur in the deep subsoils.
  • Heavy clay.
  • Slightly friable to non-friable.
  • Trace to slight amounts of soft and/or hard CaCO3; may increase up to light amounts in the deep subsoils.

Analytical Data for Selected Depths Down the Profile:

Depth
pH
Total Soluble Salts
Sodium Chloride
Moisture Retention @ 15-Bar
Moisture Retention @ 1/3-Bar
..
%
%
%
%
A
7.1
0.026
*
12.2
23.1
B
8.4
0.065
0.027
19.4
36.6
C
8.7
0.533
0.130
20.9
38.5

* Sodium Chloride contents were not measured and are expected to be very low (based on TSS <0.05%).

Occurrence:

Wal Wal clay occurs in the shallow depressions, low lying areas and slight gilgai depressions found on the gently undulating plains.
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