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SW42

Location: Cobden

Australian Soil Classification: Melacic-Mottled (& Vertic), Eutrophic, Brown CHROMOSOL (thick clay loamy surface).

Map Unit: Map Unit 20 (Maher and Martin, 1987).

General Landscape Description: Upper slope of gently undulating rise.
Site Description: Grazing paddock (dairy).
Geology: Tertiary - Gellibrand Marl

Image: SW42 Landscape
SW42 Landscape


Soil Profile Morphology:

Surface Soil

A10-30 cmVery dark greyish brown (10YR3/2); clay loam (very fine sandy); moderate coarse blocky, parting to moderate medium polyhedral and moderate fine polyhedral structure; weak consistence moist; pH 5.3:

Image: SW42 Profile
SW42 profile
A230-35 cmBrown (10YR5/3); clay loam; discontinuous and clear change to:

Subsoil

B2135-60 cmYellowish brown (10YR5/4) with many (30%) brownish yellow (10YR6/6) mottles; medium clay; strong medium blocky, parting to strong fine blocky and lenticular structure; some slickensides present; contains few (5%) very coarse (2-5cm) iron nodules in patches; weak consistence moist; pH 6.5:

B2260-80 cmLight olive brown (2.5Y5/4) with many brownish yellow (10YR6/6) mottles; medium clay; lenticular structure; weak consistence moist; pH 6.8:

B2380-110 cmLight olive brown (2.5Y5/4) with many brownish yellow (10YR6/6) mottles; medium clay; moderate very coarse prismatic, parting to moderate coarse blocky structure; large slickensides present; very firm consistence moist; pH 6.9:

B3110+ cmGrey (N5) with brownish yellow (10YR6/8) and some red mottles; medium clay; large slickensides present; very firm consistence moist; pH 6.8.

Key Profile Features:
Soil Profile Characteristics:



pH



Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Slightly Acid
Very Low
Non-Sodic
None
Deeper Subsoil
(at 1 m)
Slightly Acid
Low
Sodic
Slight1
1. Strong dispersion after remoulding.


Image: SW42 pH
Image: SW42 Salinity
The surface horizon is strongly acid. The subsoil is slightly acid.
The salinity rating is low throughout the profile.
Image: SW42 Sodicity
Graph: SW42 Clay
The surface and upper subsoil is non-sodic. The subsoil becomes sodic at about 60 cm depth.
The clay content increases markedly at 35 cm depth.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
(dS/m)
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-30
5.3
4.7
0.17
7.4
1.5
0.4
0.05
A2
30-35
B21
35-60
6.5
5.7
0.13
9.5
6.2
0.2
0.7
B22
60-80
6.8
6
0.14
8.8
7
0.2
1.4
B23
80-110
6.9
6.2
0.21
10
7.8
0.1
2.4
B3
110+
6.8
6
0.31
0.04
9
7.1
0.1
2.7

Horizon
Horizon Depth
(cm)
Acidity
meq/100g
Oxidisable Organic Carbon
%
Total
Nitrogen
%
Field
Capacity
pF2.5
Wilting
Point
pF4.2
Coarse Sand
(0.2-2.0 mm)
Fine Sand
(0.02-0.2 mm)
Silt
(0.002-0.02 mm)
Clay
(<0.002 mm)
A1
0-30
4.0
0.29
37.6
17.2
8
34
16
22
A2
30-35
B21
35-60
10
51.8
29.2
6
16
7
64
B22
60-80
53.9
30
4
14
6
68
B23
80-110
57.8
30.5
3
14
7
69
B3
110+
48.4
26.6
17
16
8
54

Profile Described By: Mark Imhof and Austin Brown (June 1998).
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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