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SW37

Location: Irrewillipe

Australian Soil Classification: Epiacidic, Epipedal, Black VERTOSOL

Map Unit: Map Unit 116 (Maher and Martin, 1987).

General Landscape Description: Level plain with Swamp Gum (E. ovata).
Site Description: Grazing paddock.
Geology: Quaternary sediments overlying Tertiary - Moorabool Viaduct Formation.

SW37 Landscape
SW37 Landscape


Soil Profile Morphology:

Surface Soil

A10-25 cmBlack (10YR2/1); heavy clay loam; strong medium blocky structure; firm consistence moist; pH 5.5:
SW37 Profile
SW37 Profile
Subsoil
B2125-60 cmVery dark brown (10YR2/2); medium clay; strong coarse blocky, parting to strong medium blocky structure; very firm consistence moist; pH 5.5:
B2260-95 cmDark greyish brown (10YR4/2) with dark yellowish brown (10YR4/4) mottles; medium heavy clay; strong fine lenticular, parting to strong very fine lenticular structure; weak consistence moist; pH 5.8; wavy change to:
B2395+ cmVery dark grey (10YR3/1) with yellowish brown (10YR5/6) mottles; medium heavy clay; strong fine lenticular, parting to strong very fine lenticular structure; weak consistence moist; pH 5.5.

Key Profile Features:
  • Clay texture throughout the soil profile.
  • The profile will display significant shrinking and swelling during wetting and drying cycles. Strong cracking will occur due to shrinking.

Soil Profile Characteristics:



pH



Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Deeper Subsoil
(at 95+ cm)
Strongly Acid
Very Low
Non-Sodic
None

SW37 pH
The whole profile is strongly acid.
SW37 Salinity
The salinity rating is low to very low
throughout the profile.
SW37 Clay
The clay content remains fairly constant throughout.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
(dS/m)
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-25
5.5
4.9
0.18
11
3.1
0.4
0.2
B21
25-60
5.5
4.7
0.1
3.7
5.5
0.2
0.3
B22
60-95
5.8
4.8
0.1
2.9
7.4
0.2
0.8
B23
95+
5.5
4.6
0.13
2.5
6.9
0.2
1.3

Horizon
Horizon Depth
(cm)
Acidity
meq/100g
Oxidisable Organic Carbon
%
Total
Nitrogen
%
Field
Capacity
pF2.5
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)
A1
0-25
16
6.4
0.53
45.9
27
6
14
21
45
B21
25-60
2.6
0.18
43.1
25.1
2
10
25
59
B22
60-95
44.8
25.3
1
7
22
66
B23
95+
42.7
23.3
2
11
21
60


Profile Described By: Mark Imhof and Austin Brown (June 1998).

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