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Site SW34

Location: Cobden.Australian Soil Classification: Bleached-Vertic, Mesotrophic, Brown CHROMOSOL
General Landscape Description: Gently undulating rise.Mapping Unit: Unit 164 (Maher and Martin, 1987).
Site Description: Grazing paddock (cleared about 10 years ago).Geology: Quaternary - Newer volcanics (basalt).

Image:  SW34 Landscape
Site SW34 Landscape


Soil Profile Morphology:

Surface Soil

A10-10 cmDark greyish brown (10YR4/2); silty clay loam; moderate coarse blocky, parting to moderate medium blocky structure; weak consistence moist; pH 5.6; abrupt change to:

Image:  SW34 Profile
Site SW34 Landscape
A2110-25 cmYellowish brown (10YR5/4), conspicuously bleached; silty clay loam; pH 5.6; clear change to:

A2225-35 cmLight yellowish brown (10YR6/4), conspicuously bleached; silty clay loam; contains many (60%) ferruginous nodules (2-10 mm in size); pH 6.0; abrupt change to:

Subsoil

B2135-50 cmYellowish brown (10YR5/6); light medium clay; moderate coarse blocky, parting to strong medium to fine blocky structure; pH 6.1; gradual change to:

B2250-70 cmYellowish brown (10YR5/6) with common red (2.5YR5/8) mottles; light medium clay; strong coarse blocky, parting to strong medium blocky structure; pH 6.0; gradual change to:

B2370-100 cmGreyish brown (10YR5/2) with many yellowish red (5YR5/8) and reddish yellow (7.5YR6/8) mottles; medium clay; strong medium polyhedral, parting to strong fine polyhedral and lenticular structure; pH 6.0; gradual change to:

B24100+ cmLight grey (10YR6/1) with reddish yellow (5YR5/8) (40%) and strong brown (7.5YR5/8) mottles; medium heavy clay; lenticular structure and slickensides present; pH 6.0.

Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.

Key Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Moderately Acid
Very Low
Non-Sodic
None
Subsoil
(B21 horizon)
Slightly Acid
Very Low
Non-Sodic
None
Deeper subsoil
(at 1 m)
Moderately Acid
Very Low
_
None


Image:  SW34 pH
Image:  SW34 Salinity
Image:  SW34 Clay
The surface horizon is moderately acid. The subsoil is slightly acid becoming moderately acid at 60 cm depth.
The salinity rating is very low throughout the profile.
The clay percentage increases abruptly at 35 cm depth.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10
5.6
4.8
0.07
2.5
0.8
0.1
0.05
A21
10-25
5.6
4.8
0.07
0.8
1.1
0.05
0.05
A22
25-35
6
5.1
<0.05
0.5
0.8
0.05
0.05
B21
35-50
6.1
5.3
0.09
1.8
4.8
0.05
0.6
B22
50-70
6
5.3
0.11
2.1
5.5
0.05
0.8
B23
70-100
6
5.4
0.11
2.3
6
0.05
0.8
B3
100+
6.1
5.6
0.11
2.3
5.9
0.05
0.9

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
0-10
32
9
5
48
21
19
A21
10-25
23
6
5
53
27
18
A22
25-35
20
6
20
45
21
16
B21
35-50
39
25
3
22
10
63
B22
50-70
51
34
2
7
4
81
B23
70-100
52
36
1
5
4
87
B3
100+
57
36
2
4
4
87

Profile Described By: Mark Imhof and Austin Brown, August 1998.
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