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LSWW13

WLRA - soil pit WW13- landscape
Gently undualting plains near Winter Lake
    Site Code
LSWW13
WLRA - soil pit WW13- profile

    Location

Winter Lake, western Victoria

    Landform

Plain

    Geology

Quaternary swamp and lake deposits: paludal silt and clay

    Element
Plain
Horizon
Depth (cm)
Description

AO

0–3

Organic layer.

A1

3–10

Brown (7.5YR4/2); loamy sand; weakly structured; pH 6.6.

A2

10–20

Pink (7.5YR7/4); sand; massive (structureless); pH 6.3.

B21

20–40

Very pale brown with many distinct brownish yellow mottles (10YR7/3); medium heavy clay; very coarse columnar, parting to strong medium polyhedral, parting to moderate fine polyhedral structure; clay skin cutans; dispersive when worked; pH 5.8.

B22

40–70

Brownish yellow (10YR6/8); sandy clay; completely dispersive; pH 7.2.

B23

70–90

Pale yellow (2.5Y7/4) with few faint brownish yellow mottles; medium heavy clay (sandy); moderate coarse prismatic, parting to strong coarse blocky structure; few manganese flecks; completely dispersive; pH 8.5.

B24k

90–150

Light grey (2.5Y7/2); medium heavy clay (sandy); moderate coarse prismatic, parting to strong coarse blocky structure; common soft calcareous segregations with few hard calcareous nodules; carbonate occurs in patches; pH 9.6.

B25

150–200+

Light grey (2.5Y7/2); medium clay (sandy); moderate coarse parting to strong medium polyhedral structure; pH 9.0.
Management considerations
  • Acidic, sandy and hydrophobic topsoil
  • Strong textural contrast between topsoil and subsoil
  • Bleached capping A2 over large hard setting clay columns, restricting water and gas movement
  • Alkaline subsoil, with increased magnesium and salinity at depth. Likely to be highly dispersive. Columnar structure, restricting rooting path options. Subsoil mottling. Clay skins on the B21 horizon repel water
  • Top of the subsoil is dispersive following cultivation when wet
  • Plant Available Water Capacity (PAWC) is considered to be low (estimated at 90 mm) for this site profile based on an Effective Rooting Depth (ERD) of 40 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 (eg. massive or very coarse, columnar or prismatic), very high carbonate (lime) content (not applicable to all plant species) or hard rock.
  • Plant Available Water Capacity (PAWC) is considered to be low (estimated at 90 mm) for this site profile based on an Effective Rooting Depth (ERD) of 40 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.
Site
WW13
Sample depth cm
pH
EC
dS/m
NaCl
%
Ex Ca
cmol-/kg
Ex Mg
cmol-/kg
Ex K
cmol-/kg
Ex Na
cmol-/kg
Ex Al
mg/kg
Ex acidity
cmol-/kg
FC
-30okPa
PWP
-1500okPa
KS
%
FS
%
Z
%
C
%
Horizon
H2O
CaCl2
AO
0–3
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
12.6
NA
NA
NA
NA
A1
3–10
6.6
6.3
0.18
NA
4.2
2
0.2
0.3
NA
NA
NA
NA
43
29.5
5.5
10.5
A2
10–20
6.3
5.7
0.05
NA
NA
NA
NA
NA
NA
NA
NA
18.0
NA
NA
NA
NA
B21
20–40
5.8
4.8
0.22
NA
2.6
8.1
0.6
2.5
NA
NA
NA
9.6
27.8
16.8
5.5
44
B22
40–70
7.2
6.2
0.26
NA
1.5
5.1
0.2
2.8
NA
NA
NA
15.3
39.5
30.7
5.5
22
B23
70–90
8.5
7.7
0.55
0.1
3.2
10
0.4
6.6
NA
NA
NA
NA
NA
NA
NA
NA
B24k
90–150
9.6
8.9
0.74
0.12
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
B25
150–200+
9
8.2
0.53
0.11
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Note: NA=not assessed
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