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SW52

Location: Cowleys Creek

Australian Soil Classification: Vertic (& Bleached-Acidic), Eutrophic, Grey DERMOSOL

Map Unit: Unit 158 (Maher and Martin, 1987).

General Landscape Description: Gently undulating rises.
Site Description: Grazing paddock (dairy).
Geology: Tertiary - Gellibrand Marl.

Image:  SW52 Landscape
SW52 Landscape


Soil Profile Morphology:

Surface Soil

A10-12 cmVery dark greyish brown (10YR3/2); very fine sandy clay loam; weak to moderate medium blocky structure; pH 5.3; clear change to:

Image:  SW52 Profile
SW52 Profile
A212-20 cmPale brown (10YR6/3), conspicuously bleached; rusty root channel mottling; very fine sandy clay loam; moderate medium blocky structure; pH 4.9; gradual change to:

Subsoil

B2120-35 cmPale brown (10YR6/3) with a few yellowish brown (10YR5/8) mottles; light clay; moderate coarse blocky, parting to strong medium blocky structure; pH 4.9; gradual change to:

B2235-65 cmBrown (10YR5/3) with many yellowish brown (10YR5/8) mottles; medium clay; moderate coarse prismatic, parting to strong medium polyhedral structure; pH 4.9; gradual change to:

B2365+ cmGrey (10YR6/1) with many yellowish brown (10YR5/8) mottles; medium clay; strong coarse polyhedral, parting to strong fine polyhedral structure; many slickensides evident; pH 5.2.

Deeper SubsoilYellowish brown (10YR5/8); clay; contains calcareous segregations.




Key Profile Features:
  • Strongly acid profile.

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Low-Moderate
Non-Sodic
None
Subsoil
(B21 horizon)
Very Strongly Acid
Low
Non-Sodic
None1
Deeper Subsoil
(at 65+ cm)
Strongly Acid
Low
Non-Sodic
Slight2
1. Slight dispersion after remoulding. 2. Strong dispersion after remoulding.

Image:  SW52 Graphs
The profile is strongly to very strongly acid throughout.
This profile has a mainly low salinity rating throughout.
The clay content increases gradually with depth.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-12
5.3
4.6
0.27
0.01
5.3
2.2
1
0.1
A2
12-20
4.9
4.2
0.13
2.6
1.5
0.4
0.05
B21
20-35
4.9
4.1
0.12
2.8
2.4
0.3
0.2
B22
35-65
4.9
4.2
0.23
6.7
5.8
0.4
0.4
B23
65+
5.2
4.4
0.21
7.9
8.8
0.2
1.3

Horizon
Horizon Depth
(cm)
Field
Capacity
pF2.5
Wilting
Point
pF4.2
Acidity
meq/100g
Oxidisable Organic Carbon
%
Total
Nitrogen
%
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
0-12
43
16.5
5.3
0.5
3
35
31
18
A2
12-20
30.8
10
1
40
35
22
B21
20-35
30.2
13.6
9.1
1
34
34
31
B22
35-65
41.3
23
1
19
18
59
B23
65+
45.2
23.2
1
15
21
58


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