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SW82

SW82 landscape
Excavation at site of SW82 and SW83
    Site Code
SW82

SW82 profile
Vertic (& Sodic), Calcic Black CHROMOSOL
    Location
East of Colac, between Warncoort-Birregurra road and railway line
    Landform
Gently undulating plain
    Geology
Quaternary basalt
    Element
Flat
    Slope
0
    Aspect
0
Horizon
Depth (cm)
Description
A1
0-10 Very dark brown (10YR2/2 moist and 10YR4/2 dry); pH 5.5; loam; clear boundary to:

B21
10-40 Black (10YR3/2 moist); medium heavy clay; medium to fine (5-20 mm) polyhedral structure; strong consistence; pH 5.8; gradual boundary to:

B22
40-90 Black (10YR2/1 moist); heavy clay; some pockets of fine buckshot; coarse prismatic, parting to fine lenticular structure; strong consistence; pH 6.8; abrupt boundary to:

B23ssgk
90 +Dark greyish brown (10YR4/2 moist) with brownish yellow (10YR6/6 moist) and minor (<2%), light olive brown (2.5Y5/4 moist) mottles; soft carbonate and strongly vertic; medium (20-50 mm) prismatic structure; strong consistence; pH 8.5.

Management considerations
The soil is a ‘puff’ in a variable Gilgai complex comprising Sodosols (SW83), Chromosols and Vertosols (SW84). Waterlogging and shrink-swell activity of the clays are the principle hazards in this landscape.

Analytical data
Site SW82
Sample
depth
pH
EC
NaCl
Ex Ca
Ex Mg
Ex K
Ex Na
Ex Al
Ex acidity
FC
(-10kPa)
PWP
(-150kPa)
KS
FS
Z
C
Horizon
cm
H2O
CaCl2
dS/m
%
cmolc/kg
cmolc/kg
cmolc/kg
cmolc/kg
mg/kg
cmolc/kg
%
%
%
%
%
%
A1
0-10
5.5
4.9
0.21
N/R
6.2
3.2
0.61
0.37
<10
12
25.6
10.8
22.9
37
13.5
20.5
B21
10-40
5.8
4.8
0.10
<0.01
7.2
7.9
0.4
0.5
18
15
39.6
24.6
12.5
20.5
7
55.5
B22
40-90
6.8
5.6
0.09
N/R
7.9
13
0.41
1.8
N/R
N/R
45.5
26.7
10.6
15.7
5.5
63
B23
90+
8.5
7.3
0.17
N/R
6.5
12
0.27
3.2
N/R
N/R
N/R
N/R
17.8
24.6
7
48
CC BY 4.0 AU

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