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SW36

Location: Irrewillipe

Australian Soil Classification: Melacic-Mottled, Eutrophic, Black DERMOSOL

Map Unit: Map Unit 125 (Maher and Martin, 1987).

General Landscape Description: Level plain.
Site Description: Grazing paddock (dairy).
Geology: Tertiary - Moorabool Viaduct Formation.

SW36 Landscape
SW36 Landscape


Soil Profile Morphology:

Surface Soil

A110-20 cmVery dark grey (10YR3/1); clay loam (veryfine sandy); rusty root channel mottling; moderate fine blocky structure; weak consistence dry; pH 5.0:
SW36 Profile
SW36 Profile
A1220-30 cmVery dark greyish brown (10YR3/2); clay loam; rusty root channel mottling; moderate medium blocky, parting to fine blocky structure; very firm consistence dry; contains very few (1%) ferruginous nodules (2-5 mm in size); pH 5.3; gradual change to:
Subsoil
B130-50 cmDark greyish brown (10YR3/2) with a few faint yellowish brown (10YR5/8) mottles; rusty root channel mottling; light clay; moderate coarse polyhedral, parting to moderate medium polyhedral structure; firm consistence moist; contains very few (1%) ferruginous nodules (2-5 mm in size); pH 5.6:
B2150-60 cmVery dark grey (10YR3/2) with a few faint yellowish brown (10YR5/6) mottles; light medium clay; strong coarse prismatic, parting to moderate coarse blocky and strong fine blocky structure; strong consistence dry; pH 5.3:
B2260-100 cmVery dark grey (10YR3/1); medium clay; strong coarse prismatic, parting to strong medium prismatic and strong coarse blocky structure; strong consistence dry; pH 5.3.

Soil Profile Characteristics:



pH



Salinity Rating
Surface
(A11 horizon)
Strongly Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Strongly Acid
Low
Non-Sodic
None
Deeper subsoil
(at 1 m)
Strongly Acid
Low-Moderate
Non-Sodic
None

SW36 pH
The whole profile is strongly acid throughout.
SW36 Salinity
The salinity rating is low for the surface
and upper subsoil. At 80 cm depth the
salinity increases to low to moderate.
SW36 Clay
The clay content increases gradually with depth.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
(dS/m)
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A11
0-20
5
4.4
0.14
4.3
1.5
0.2
0.1
A12
20-30
5.3
4.5
0.08
4
1.7
<0.1
0.1
B1
30-50
5.6
4.7
0.07
4.1
2.5
<0.1
0.2
B21
50-60
5.3
4.6
0.2
3.4
3.2
<0.1
0.5
B22
60-100
5.3
4.7
0.35
3.6
4.5
<0.1
0.6

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)
A11
0-20
4.0
0.3
33.2
14.1
7
39
21
25
A12
20-30
2.3
0.15
29.6
11.5
7
41
19
28
B1
30-50
8.3
28.1
11.6
7
40
19
31
B21
50-60
11.0
33
17.6
6
31
16
44
B22
60-100
34.5
19.1
6
29
14
50
Profile Described By: Mark Imhof and Austin Brown (June 1998).
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