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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.