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LSWW07

WLRA - soil pit WW7- landscape
Gentle plains near Lillimur South

WLRA - soil pit WW7- profile
Hypercalcic, Mottled-Subnatric, Grey SODOSOL

    Location

Kaniva South Road, Lillimur South, western Victoria

    Landform

Plain

    Geology

Quaternary Lowan Formation: aeolian fine to medium grained dune sand

    Element

Plain

Horizon
Depth (cm)
Description

A1

0–10

Very dark greyish brown (10YR3/2); light fine sandy loam; pH 6.1:

A2

10–12

Conspicuously bleached hard setting sand that tends to occur in patches, as domed capping on top of columnar subsoil structure:

B21

12–30

Light greyish brown (10YR6/2) with a few faint brownish yellow mottles; medium clay (sandy); strong very coarse columnar structure; very strong consistence when dry (completely dispersive); pH 8.6:

B22
30–50

Very pale brown (10YR7/3) with a few faint yellow mottles; medium clay (sandy); strong very coarse columnar structure; strongly dispersive; pH9.3:

B23

50–100

Very pale brown (10YR7/3) with yellow and reddish yellow mottles; medium clay (sandy); many soft calcareous segregations and very few hard calcareous nodules; completely dispersive; pH 10:

B24

100–190+

Light grey (5Y7/2); medium clay (sandy); moderate coarse polyhedral structure; smooth ped-fabric; few soft and hard calcareous segregations; manganese flecks occur at depth; pH 9.9.

Management Considerations

  • Strong texture contrast between topsoil and subsoil
  • Shallow topsoil
  • Bleached A2 horizon
  • B21 and B22 horizons have large hard setting columnar structure
  • Sodic subsoil
  • Strongly dispersive mottled subsoil
  • Acidic topsoil and highly alkaline subsoil
  • Plant Available Water Capacity (PAWC) is considered to be very low (estimated at 15 mm) for this site profile based on an Effective Rooting Depth (ERD) of 12 cm.
  • Rooting depth will be restricted by subsoil conditions, such as; strongly sodic (Exchangeable Sodium Percentage >20%), high soluble salt levels (chloride >0.1%), poor structure (e.g. massive or very coarse, columnar or prismatic), very high carbonate (lime) content (not applicable to all plant species) or hard rock.
  • Soil cracks when dry, vertic (expansive clay material)
  • Plain, poor site drainage

Horizon
Depth (cm)
pH (water)
pH (CaCl2)
EC
dS/m
NaCl
%
Exchangeable Cations
cmol-/kg
Wilting Point
(pF4.2)
Coarse Sand
%
Fine Sand
%
Silt
%
Clay
%
Ca
Mg
K
Na
A1
0–10
6.1
5.1
0.09
2.4
1.7
0.5
0.5
8.4
26.1
48.4
3.5
15
A2
10–12
15.3
B21
12–30
8.6
7.7
0.16
6.7
6.9
1.3
1.9
15.5
20.5
37.6
3
34
B22
30–50
9.3
8.4
0.22
7.4
7.5
1.3
2.4
23.4
36.8
2
30.5
B23
50–100
10
9
0.52
1.5
8.4
1.1
7.1
B24
100–190+
9.9
9
0.47
<0.05
CC BY 4.0 AU

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