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SW14

Location: Lake Corangamite


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

General Landscape Description: Lunette.
Site Description: Lower waning slope within an open depression.
Landuse: Pasture grazing – sheep and beef.

Geology: Quaternary aeolian deposits derived from lake bed sediments.

Image:  SW12-15 Landscape

SW14 Landscape. View of terrace and Lake Corangamite.

Soil Profile Morphology:


Surface Soil

A10-10 cmBlack (N2.5/0); silty clay; fine (1-5 mm in size) polyhedral structure; contains quarts; moderately calcareous; pH 8.3; clear change to:

Image:  SW14 Profile
SW14 Profile
Subsoil

B2110-50 cmVery dark grey (2.5Y3/1) with black (N2.5/0) in fissures; medium heavy clay; fine (10-12 mm is size) prismatic structure; contains calcium carbonate; some shells present; contains many fine roots and a common amount of medium sized roots; moderately calcareous; pH 8.8; abrupt and smooth change to:

2A150-60 cmBlack (N2.5/0); medium clay; fine (2-10 mm sized) polyhedral structure; friable consistence; contains occasional carbonate; many fine sized roots present; pH 8.7; clear change to:

2B21bt60-90 cmBlack (N2.5/0); medium heavy clay; medium prismatic, parting to angular blocky structure; very slightly calcareous; pH 9.1; gradual change to:

2B22bk90-100 cmBlack (N2.5/0); medium heavy clay; medium prismatic parting to coarse polyhedral structure; contains a common (>20%) amount of soft, very coarse (20-50 mm in size) carbonate segregations; contains a common amount of fine roots; pH 9.4.
Image:  SW13 Profile selfmulching
SW14 Self-mulching surface condition.

Soil Profile Characteristics:



pH


Salinity Rating
Surface
(A1 horizon)
Moderately Alkaline
Low to Medium
Non Sodic
None
Subsoil
(B21 horizon)
Strongly Alkaline
Low to Medium
Non Sodic
None
Deeper Subsoil
(at 90-100 cm)
Very Strongly Alkaline
Low to Medium
Sodic
None1
1Strong dispersion after remoulding.


Graph: SW14

The surface horizon is moderately alkaline. The subsoil is strongly alkaline, becoming very strongly alkaline with depth. The salinity rating is low to medium throughout the profile.
    The surface and the upper subsoil is non sodic. The deeper subsoil is sodic.
    Clay content is moderate throughout the profile.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
ds/m
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A11
0-10
8.3
7.8
0.24
37
28
2.7
0.84
B21kt
10-50
8.8
8.2
0.27
<0.05
18
41
1.3
0.79
2A1
50-60
8.7
8.1
0.22
9.1
57
2.2
1.6
2B21bt
60-90
9.1
8.5
0.44
0.06
2
47
2.5
3.8
2B22bk
90-100
9.4
8.7
0.54
<0.05
1.1
34
2.2
6.7

Horizon
Horizon Depth
(cm)
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
0-10
42.4
0.2
20
28
23
B21kt
10-50
33.4
0.1
25
20
22
2A1
50-60
40.9
0.1
40
27
16
2B21bt
60-90
37.6
0.1
32
26
23
2B22bk
90-100


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

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