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SW53

SW53 landscape
View to south-west from site

    Site Code
SW53
SW53 profile
Vertic (and Sodic), Calcic Grey CHROMOSOL

    Location
Cooriemungle (Boorook Road), Heytesbury district, south-west Victoria
    Landform
Rolling hills
    Geology
Neogene Gellibrand Marl: marine clays
    Element
Crest
    Slope
2%
    Aspect
South-west
Horizon
Depth (cm)
Description
A1
0–15Very dark greyish brown (10YR3/2 moist and 10YR5/3 dry); silty clay loam; weakly pedal structure; medium to fine (2–20 mm) polyhedral structure; pH 5.7; abrupt and smooth boundary to:

B21g
15–60/70Dark greyish brown (2.5Y4/2 moist) common (~15%), yellowish brown (10YR5/8 moist) mottles; medium clay; coarse (20–50 mm) polyhedral, parting to medium to fine (2–20 mm) polyhedral structure; pH 5.7; gradual and wavy boundary to:

B22g
60/70–105/115Light olive grey (2.5Y5/4 moist [50%] and grey 2.5Y5/1 moist [50%]); medium to heavy clay; coarse (50 mm) polyhedral or angular blocky , parting to medium to fine (5–20 mm) polyhedral structure; slickensides (>20 mm); pH 7.4; abrupt and irregular boundary to:

B23kgss
105/115–160+Light olive grey (5Y6/2 moist); common (~20%),yellowish brown (10YR5/8 moist) mottles; heavy clay; very coarse (100–300 mm) angular blocky, parting to coarse (20–50 mm) polyhedral or angular blocky, and medium to fine (2–20 mm) lenticular structure; soft white calcareous accumulations (up to 100 mm) at top of horizon; slickensides (>100 mm); pH 8.9.

Management considerations
Generally used for dairying, these soils are prone to waterlogging and pugging. Although there is calcium carbonate at depth, surface horizons tend to be acidic and respond well to liming. On the steeper slopes this soil is highly prone to landslides. Subsurface drainage incorporating closely spaced mole drains works well in these soils.

Analytical data
Site SW53
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
5.7
4.9
0.11
N/R
8.8
3.8
0.63
0.48
13
15
38.6
17.4
7.4
25.4
30
27
B21
15-60
5.7
4.5
0.1
N/R
8.5
9.4
0.51
1.2
240
13
44.5
24.1
0.5
17.4
19
58.5
B22
70-105
7.4
6.2
0.16
N/R
16
13
0.43
3.2
N/R
N/R
53
26.3
0.7
12.1
17.5
65
B23
105-160
8.9
8.9
0.77
0.09
16
14
2.9
5.8
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R

SW53 image 2
Slip plane features evident in trench below SW53: view downslope (left) profile view (centre), view upslope (right)
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