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ALRA066

WLRA - soil pit ALRA66 - landscape
Colluvial slopes leading to Mt William Creek
    Site Code
ALRA066




    Location

Long Gully Road, Pomonal

    Landform

Scarp-footslope

    Geology

Grampians colluvium

    Element

Hillslope

    Slope

5%

    Aspect

North
Horizon
Depth (cm)

A11

0–10

Very dark grey (7.5YR2.5/1); loamy sand; massive (structureless); very weak consistence when moderately moist; many fine roots; pH 5.5; clear and wavy boundary to:
WLRA - soil pit ALRA66 - profile
Parapanic, Humosesquic, Aeric PODOSOL

A12

10–30

Dark greyish brown (7.5YR4/1); loamy sand; massive (structureless); very weak consistence when dry; common very fine roots; pH 5.0; clear and smooth boundary to:

A2

30–55

Pinkish grey (7.5YR6/2); sporadically bleached (7.5YR7/1 dry); loamy sand; massive (structureless); very weak consistence when dry; common very fine roots; pH 5.5; abrupt and tongued boundary to:

Bhs

55–95

Olive yellow (2.5Y6/6); "coffee rock layer"; massive (structureless); very firm consistence when dry; moderately cemented discontinuous massive orstein pan; common very fine roots; pH 6.0; clear and wavy boundary to:

B2

95–120+

Light brownish grey (10YR6/2) with many very coarse prominent brownish yellow mottles; medium clay; massive (structureless); very firm consistence when dry; common prominent slickensides; common very fine roots; pH 6.5.

Management Considerations:

  • A horizon has been leached, particularly subsurface soil.
  • High permeability and water drainage capacity through the A horizon.
  • Coffee rock formed at the boundary of the A and B horizons from the accumulated deposits of organic matter and sesquioxides.
  • Many fine roots are observed to the top of the B horizon where the orstein pan "coffee rock" provides an impediment to root growth (especially perennial and annual grasses).
  • Old former tree roots penetrating the B horizon give effect of horizon tonguing.
  • Lateral flow of water along the top of the B horizon is evident.
  • Strongly acidic profile, low nutrient status with a low base nutrient status.

Chemical Analysis:

Horizon
Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Exchangeable Aluminium
cmol-/kg
Exchangeable Acidity
cmol-/kg
Phosporus
(Olsen)
mg/kg
Total Nitrogen
Organic Carbon
%
Exchangeable Cations
cmol-/kg
Field Capacity
(pF2.5)
Wilting Point
(pF4.2)
Coarse Sand
%
Fine Sand
%
Silt
%
Clay
%
Ca
Mg
K
Na
Bulk sample
0–10
5.3
4.7
0.05
29
0.16
3.1
A11
0-10
5.5
4.9
0.05
<10
7.1
3.5
5.3
0.75
0.22
0.1
4.5
5.7
44.3
43.6
5.0
1.5
A12
10-30
4.3
3.9
<0.05
33
3.7
0.99
0.48
0.07
0.07
<0.05
4.3
1.1
45.2
46.8
4.0
2.5
A2
30-55
4.3
4
<0.05
19
1.6
0.19
<0.05
0.05
<0.05
7.4
0.7
45.2
47
5.5
2.5
Bhs
55-95
5.6
5.2
<0.05
19
8.5
0.55
0.12
0.06
0.07
21.3
2.4
37.1
49.1
6.5
2.5
B2
95-120+
5.3
4.5
<0.05
150
0.8
3.4
0.44
0.12
22.1
12.1
25.1
37.7
5.0
31.5
CC BY 4.0 AU

This page contains material sourced from the Victorian Resources Online (VRO) website, originally published by the State Government of Victoria.

The content is provided under the Creative Commons Attribution 4.0 Australia licence (CC BY 4.0 AU).

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