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SW73

SW73 landscape
View eastwards along pipeline trench sites SW73 to SW74

    Site Code
SW73
SW73 profile
Bleached-mottled, Mesotrophic, Brown CHROMOSOL

    Location
Hills south of Colac, between Christies and Colac/Lavers Hill Roads
    Landform
Undulating low hills
    Geology
Paleogene sediments: Dilwyn or Eastern View Formation
    Element
Waxing upper slope
    Slope
5%
    Aspect
East
Horizon
Depth (cm)
Description
A1
0-15Dark brown (10YR3/3 moist), fine sandy loam; weakly pedal; weak consistence (dry); pH 5.4; boundary to:

A2
15-40 Dark greyish brown (10YR4/2 moist), pale brown (10YR6/3 dry); conspicuously bleached; sandy loam; apedal, massive; very firm consistence (dry); minor (<5%), coarse (5-15 mm) irregular rounded ferruginised sandstone gravel; pH 5.6; abrupt to clear and wavy boundary to:

B21t
40-70 Dark yellowish brown (10YR4/5 dry) with prominent medium (5–15 mm) red (10R4/8 moist) to dark red (2.5YR4/8 moist) to yellowish brown (10YR6/8 moist) mottles in ped interiors, reddest in ped centres; medium clay; coarse prismatic structure; pH 5.8; strong consistence (dry); gradual boundary to:

B22t
70/80–100/110 Dark yellowish brown (10YR4/5 moist and dry) with prominent medium (5–15 mm), red (10R4/8 moist) to dark red (2.5YR4/8 moist) to yellowish brown (10YR6/8 moist) mottles in ped interiors (reddest away from ped face); medium clay; white (2.5Y8/1) clay adjacent to cutans; pH 6; gradual boundary to:

B/C
100/110 +Weak red to dusky red (10R5/3-3/2); ferruginised sandstone with yellowish and white edges; clay infill and weathering in joints; pH 6.0.

Management considerations
Hard setting (dry) and ‘spewy’ (wet) topsoils are characteristic of soils in the district. Soils in this landscape become very waterlogged on the slopes. The swelling properties of the subsoil clay restricts downward drainage and encourages perching of water in the A2 and lateral flow downslope. Topsoil is moderately acidic and would benefit from lime.

Analytical data
Site SW73
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
5.4
4.8
0.17
N/R
5.2
1.1
0.49
0.32
17
15.0
26.5
10.2
23.8
38.4
12.0
13.0
A2
20-40
5.6
4.9
0.1
N/R
0.62
0.91
0.07
0.1
<10
4.8
14.6
4.2.0
24.8
45.9
22.0
6.0
B21
50-65
5.8
5.2
0.11
N/R
1.9
7.4
0.1
0.53
<10
9.4
42.4
27.6
9.0
10.5
7.5
73.5
B22
80-95
6.0
5.2
0.06
N/R
1.5
6.4
0.07
0.4
<10
7.9
36.0
23.6
16.3
12.2
6.5
63.0
B/C
105+
6.0
5.2
<0.05
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
N/R
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