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ALRA069

WLRA - soil pit ALRA69 - landscape
Plains near Barton
    Site Code
ALRA069



    Location

Morass Road, Barton

    Landform

Gently undulating plain

    Geology

Quaternary Newer Volcanics: extrusive tholeitic to alkaline basalt, scoria and ash

    Element

Plain

    Slope

1%

    Aspect

West
Horizon
Depth (cm)

A1

0–15

Dark brown (7.5YR3/2); clay loam; strong very fine subangular blocky structure; rough fabric; weak consistence when moderately moist; pH 5.5; gradual and smooth boundary to:
WLRA - soil pit ALRA69 - profile
Vertic (& Ferric), Mottled-Hypernatric, Brown SODOSOL

A21

15–30

Greyish brown(10YR5/2); sporadically bleached light grey (10YR7/2 moist); clay loam; massive (structureless); firm consistence when dry; pH 6.0; abrupt and wavy boundary to:

A22

30–40

Greyish brown (10YR5/2); sporadically bleached light grey (10YR7/2 moist); common fine distinct strong brown (7.5YR5/6) mottles; clay loam; weak medium size subangular blocky structure; rough fabric; strong consistence when dry; many fine and medium ferromanganiferous nodules; pH 6.5; clear and wavy boundary to:

B21

40–70

Light olive brown (2.5Y5/6) with common fine faint greyish brown (2.5Y5/2) and fine strong brown (7.5YR5/6) mottles; medium heavy clay; moderate coarse polyhedral structure; few medium manganiferous concretions; smooth fabric; few distinct slickensides; very firm consistence when moderately moist; pH 7.0; gradual and wavy boundary to:

B22

70–110+

Light olive brown (2.5Y5/4); medium heavy clay; moderate medium and coarse prismatic structure; smooth fabric; few distinct slickensides; very firm consistance when moderately moist; pH 7.0.

Management Considerations:

  • Site exhibits a number of gilgais of mostly normal type with some possible linear type gilgai occurring, indication of vertic subsoil
  • Abundance of roots in the acidic topsoil
  • Strongly dispersive intermittent A22 horizon
  • Wavy boundary between A and B horizon due to gilgai nature of the soil profile
  • Strong texture contrast soil with variable depth to subsoil (variable plant water availability)
  • Prominent cracking in the B22 horizon
  • Strongly sodic neutral subsoil which is dispersive, also with an elevated magnesium level compared to A horizon (>12 cmolc/kg). Higher concentrations of soluble salts in vertic subsoil

Chemical Analysis:

Horizon
Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Exchangeable Aluminium
cmol-/kg
Organic Carbon
%
Exchangeable Cations
cmol-/kg
Field Capacity
(pF2.5)
Wilting Point
(pF4.2)
Coarse Sand
%
Fine Sand
%
Silt
%
Clay
%
Ca
Mg
K
Na
A1
0-15
5.5
4.9
0.1
<10
3.0
3.4
1.7
0.27
0.51
27.7
7.2
9.4
48.7
21.0
12.5
A21
15-30
6.0
5.4
0.08
<10
1.7
0.68
0.05
0.37
23.9
2.7
9.7
58.1
23.5
6.0
A22
30-40
7.3
6.6
0.13
<10
1.8
2.8
0.1
1.2
19.7
7.3
17.1
47.2
17.5
14.0
B21
40-70
7.4
6.9
0.55
3.6
12
0.2
5.6
46.6
24.3
7.9
19.0
9.5
60.5
B22
70-110+
7.1
6.7
1.0
2.9
15
0.2
7.5
48.2
23.6
3.9
16.2
15.0
59.0
CC BY 4.0 AU

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