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SW71

SW71 landscape
View from site SW71 westwards along pipeline easement (SW70 is on the distant slope).
    Site Code
SW71
SW71 profile
Bleached-Vertic (and mottled), Magnesic, Brown CHROMOSOL

    Location
Foothills south of Colac; between Irrewillipie road and Colac-Lavers Hill road
    Landform
Undulating low hills
    Geology
Cretaceous Otway Group: volcanogenic sandstone
    Element
Waxing upper slope
    Slope
8%
    Aspect
West
Horizon
Depth (cm)
Description
A1
0–20 Dark grey (10YR4/1 moist), greyish brown (10YR5/2 dry), fine sandy loam; moderately pedal; weak to firm consistence; pH 5.5; boundary to:

A2e
20–50/60 Light brownish grey (2.5Y6/2 moist), conspicuously bleached (2.5Y8/1 dry); fine sandy loam; hardsetting; common (<20%) fine ferromanganiferous gravel (mostly not magnetic) sporadic and not in thick layer; very firm consistence; clear to gradual change (incipent B1) to; pH 5.8; boundary to:

B21ss
 50/60–100/120 Dark yellowish brown (10YR3/4 moist and dry); many (~25%), faint, fine to coarse (5-20 mm) yellow brown/dark red mottles; heavy clay; coarse (50-120 mm) prismatic, parting to thick lenticular or angular blocky structure; slickensides; pH 6.0;diffuse yellower; boundary to:

C/B
100/120+Brownish yellow (10YR6/8 moist) to yellow (10YR8/8 dry); fine sandy with white (10YR8/1 moist) and very dark grey (5YR3/1 moist) ped faces; below 150 cm extremely hard to break with geopick; cemented ferruginised sandstone.

Management considerations
Fine sandy loam topsoil overlying this swelling clay (80% clay in the subsoil) renders this profile subject to waterlogging. Water erosion is also a hazard for this soil. Chemical fertility is low and the soil is acidic – Aluminium toxicity to plant growth is likely to reduce pasture yields unless lime is applied.

Analytical data
Site SW71
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
4.7
0.12
N/R
3.2
2.1
0.23
0.35
23
14
33.5
11.4
9.5
38
26.5
18
A2
30–50
5.8
4.7
<0.05
N/R
0.67
0.96
<0.05
0.17
23
6.2
19.1
6.8
7.8
44.5
24
23.5
B21
65–85
6
4.9
0.1
N/R
1.2
12
0.15
1.4
19
13
43
27
1.4
11.4
7
79.5
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