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SW13

Location: Lake Corangamite


Australian Soil Classification: Endocalcareous, Self-Mulching, Black VERTOSOL

General Landscape Description: Lunette.
Site Description: Upper mid slope. Weak gilgai evident.
Landuse: Pasture grazing – sheep and beef.

Geology: Quaternary aeolian deposits derived from lake bed sediments.

Image: SW12-15 Landscape
SW13 Landscape – view downslope from SW14 towards the lower slope and terrace of the lunette.

Soil Profile Morphology:

Surface Soil


A110-4 cmBlack (N2.5/0); surface self mulching and cracking; silty clay; very fine polyhedral structure; pH 7.8; clear and smooth change to:

Image: SW13 Profile
SW13 Profile
A124-15 cmBlack (N2.5/0); silty clay; coarse polyhedral, parting to fine polyhedral structure; very firm consistence dry; contains an abundant amount of fine sized roots; pH 8.1; clear and smooth change to:
Subsoil

B21kt15-30 cmBlack (N2.5/0); light medium clay; coarse prismatic, parting to coarse angular blocky, parting to very fine polyhedral structure; contains very few (<5%) carbonate segregations; faint slickensides evident; slightly calcareous; pH 8.5; gradual and smooth change to:

B22kt30-60 cmDark grey (N4/0); medium clay; coarse prismatic, parting to coarse angular blocky, parting to very fine polyhedral structure; strong consistence dry; contains a common (10-20%) amount of soft, pinkish grey coloured (5YR7/2) carbonate segregations; very fine slickensides evident; pH 9.2; gradual and wavy change to:

B360-100 cmOlive grey (5YR5/2); light clay; coarse prismatic parting to polyhedral structure; contains shell fragments; contains fine (2 mm in diameter) roots; very fine pores present; pH 9.6.

Image: SW13 Profile cracking
Cracking and self-mulching surface condition.

Soil Profile Characteristics:


pH


Salinity Rating
Surface
(A1 horizon)
Slightly Alkaline
Low to Medium
Non Sodic
None
Subsoil
(B21 horizon)
Moderately Alkaline
Low to Medium
Sodic
None
Deeper Subsoil
(at 60-100 cm)
Extremely Alkaline
Very High
Strongly Sodic
None1
1Strong dispersion after remoulding.


Graph: SW13

    The surface horizon is slightly alkaline. The subsoil is moderately alkaline, becoming extremely alkaline with depth.
      The salinity rating in the surface and upper subsoil is low to medium. The salinity rating for the deep subsoil is very high.
    The surface soil is non sodic. The subsoil is sodic with the deeper subsoil becoming strongly sodic.
    The clay content is low throughout the profile.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
ds/m
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A11
0-4
7.8
7.4
0.27
<0.05
27
35
3.1
0.85
A12
4-15
8.1
7.6
0.21
29
37
2.1
0.98
B21kt
15-30
8.5
7.9
0.22
34
47
1.5
1.5
B22
30-60
9.2
8.5
0.38
<0.05
3.5
32
1.7
4.3
B3kt
60-100
9.6
8.5
0.71
<0.05
0.8
28
2.2
11
Horizon
Horizon Depth
(cm)
Total
Nitrogen
g/100g
Organic Carbon
%
Wilting
Point
pF4.2
Coarse Sand
(0.2- 2.0 mm)
Fine Sand
(0.02- 0.2 mm)
Silt
(0.002- 0.02 mm)
Clay
(<0.002 mm)
A11
0-4
0.39
4.7
40
2
20
35
25
A12
4-15
39
0
12
29
39
B21
15-30
41
0
25
30
22
B22
30-60
35
0
25
23
17
B3
60-100
0
26
25
18


Profile Described By: Richard MacEwan, John Martin, Mark Imhof (March 1997).

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