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Site SW42

Location: CobdenAustralian Soil Classification: Melacic-Mottled (& Vertic), Eutrophic, Brown CHROMOSOL (thick clay loamy surface).
General Landscape Description: Upper slope of gently undulating rise.Mapping Unit: Unit 20 (Maher and Martin, 1987).
Site Description: Grazing paddock (dairy).Geology: Tertiary - Moorabool Viaduct Formation.

Image: SW42 Landscape
Site 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 blocky and moderate fine polyhedral structure; weak consistence moist; pH 5.3:

Image: SW42 Profile
Site 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; 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:
  • Strong texture contrast between surface (A) horizon and subsoil (B21) horizon.

Key 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 very low becoming low at 1 metre depth.
Image: SW42 Sodicity
Image: SW42 Clay
The surface and upper subsoil is non-sodic. The subsoil becomes sodic as 60 cm depth.
The clay content increases markedly at 35 cm depth.
Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
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)
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
37.6
17.2
8
34
16
22
A2
30-35
B21
35-60
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, August 1998.
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