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SW83

SW82 image 1
Gilgai features close to SW82 and SW83

    Site Code
SW83
SW82 image 2
Vertic (& Calcic), Subnatric, Black SODOSOL

    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), dark greyish brown (10YR4/2 dry); loam; pH 5.5; clear change to:

A2
10-60 Dark greyish brown (10YR4/2 moist), conspicuously bleached; (10YR7/2 dry); sandy clay loam; apedal massive structure; few [2%], fine buckshot nodules [concentrated in pockets]; pH 6.6; abrupt and wavy change to:

B21
60-90 Black (10YR2/1 moist); heavy clay; few pockets of ferruginous fine gravel; coarse prismatic structure; pH 6.8; abrupt change to:

B22
90 +Mottled dark greyish brown grey with (10YR6/1 moist) and minor (<2%), brownish yellow (10YR6/8 moist) and light olive brown (2.5Y5/4 moist) mottles, soft calcareous segregations; strongly vertic; medium clay; medium prismatic structure; pH 8.6.

Management considerations
The soil is a ‘hollow’ in a variable Gilgai complex comprising Sodosols, Chromosols (SW82) and Vertosols (SW84). Waterlogging and shrink-swell activity of the clays are the principle hazards in this landscape.

Analytical data
Site SW83
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
A2
10-60
6.6
6
0.06
N/R
1.7
1.4
<0.05
0.18
N/R
3.3
16.6
3.8
28.6
46.2
14
11.5
B21
60-90
6.8
5.6
0.11
N/R
5.9
11
0.3
2.4
N/R
11
39.4
22.4
14.4
21.4
7
54.5
B22
90+
8.6
7.5
0.25
N/R
7
12
0.28
4
N/R
N/R
39.3
19.9
15.3
28.4
7.5
46.5
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