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CRC12

Location: Ararat

Australian Soil Classification: Bleached-Sodic, Magnesic, Yellow DERMOSOL

General Landscape Description: SE aspect, mid slope; hills – edge of colluvial "shoulder".
Site Description: Grazing paddock – runoff demonstration site.
Geology: Ordovician thinly bedded shale (micaceous).


Image: GH1-4 - Landscape
CRC12 Landscape

Soil Profile Morphology

Surface Soil
A10-10 cmDark brown (10YR3/3); light fine sandy clay loam; pH 5.0; clear change to:
Image: GH3 Profile
CRC12 Profile





A210-25 cmLight yellowish brown (10YR6/4); very fine sandy clay loam (with some Al horizon infill material); pH 5.5; clear change to:
Subsoil
B125-50 cmLight yellowish brown (10YR6/4) with brownish yellow (10YR6/8) mottles; heavy silty clay loam; moderate to strong very coarse prismatic, parting to moderate to strong medium polyhedral structure; very little gravel (2%); pH 6.1; gradual change to:
B21 50-80 cmBrownish yellow (10YR6/8) with reddish yellow (7.5YR6/6) mottles; light clay (silty); moderate to strong medium to fine polyhedral structure; extensive manganese staining (30-40%); pH 6.8:
B22 80-100 cmBrownish yellow (10YR6/8) with red (2.5YR5/8); light medium clay; pH 7.0:
B/C100-120 cmWeathering shale.

Note: Quartz gravel is variable in depth and amount between 30-80 cm depth


Image: GH3 side variation of profile
Side variation of soil profile. Note: Variation in quartz gravel distribution.


Key Profile Features


Key Profile Characteristics

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Subsoil
(B21c horizon)
Slightly Acid
Very Low
Marginally Sodic
None
Deeper subsoil
(at 80-100 cm)
Neutral
Very Low
Marginally Sodic
None
Image: GH3 graphs
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Exchangeable Aluminium
ppm
Exchangeable Acididty
meq/100g
Exchangeable Cations
Coarse Sand
(0.2-2.0 mm)
%
Fine Sand
(0.02-0.2 mm)
%
Silt
(0.002-0.02 mm)
%
Clay
(<0.002 mm)
%
Ca
Mg
K
Na
meq/100g
A1
0-10
5
4.4
0.09
43
6.8
3.6
1.8
0.36
0.18
20
37
18
18
A2
10-25
5.5
4.6
<0.05
40
5.1
0.99
1.0
0.12
0.14
5
48
29
17
B1
25-50
6.1
5.1
<0.05
10
6.2
0.57
2.5
0.12
0.33
6
35
25
32
B21
50-80
6.8
6.1
0.10
3.1
0.29
6.6
0.24
0.83
13
17
24
45
B22
80-100
7
6.3
0.10
0.08
6.8
0.18
0.75
9
34
17
38

    Profile Described By: Mark Imhof, Austin Brown and Malcolm McCaskill - November 2003
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