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SW38

Location: Irrewillipe

Australian Soil Classification: Ferric-Sodic, Mesotrophic, Grey CHROMOSOL

Map Unit: Map Unit 157 (Maher and Martin, 1987).

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

SW38 Landscape
SW38 Landscape


Soil Profile Morphology:

Surface Soil

A10-15 cmVery dark brown (10YR2/2); light fine sandy clay loam; moderate coarse polyhedral, parting to moderate medium polyhedral structure; weak consistence moist; pH 6.1:
SW38 Profile
SW38 Profile
A2115-45 cmDark brown (10YR3/3), sporadically bleached; rusty root channel mottling; light fine sandy clay loam; weak medium blocky, parting to moderate medium blocky structure; weak consistence moist; pH 5.7:
A2245-55 cmDark brown (10YR4/3); fine sandy clay loam; contains very many (80%) ferruginous nodules (4-20 mm in size); pH 6.4:
Subsoil
B2155-90 cmDark brown (7.5YR4/2) with many strong brown (7.5YR5/8) mottles; light medium clay; strong medium blocky, parting to strong fine polyhedral structure; firm to strong consistence moist; contains a few (5-10 %) ferruginous nodules (4-20 mm in size); pH 6.7:
B2290+ cmLight brownish grey (10YR6/2) with reddish yellow (7.5YR6/8) and red (2.5YR4/8) mottles; medium clay; strong medium blocky, parting to strong fine polyhedral structure; firm consistence moist; contains a few (5-10 %) ferruginous nodules; pH 6.8.

Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.

Soil Profile Characteristics:



pH



Salinity Rating
Surface
(A1 horizon)
Slightly Acid
Very Low-Low
Non-Sodic
None
Subsoil
(B21 horizon)
Slightly Acid
Very Low
Non-Sodic
None
Deeper subsoil
(at 90+ cm)
Slightly Acid
Very Low
Non-Sodic
None

SW38 pH
The surface is slightly acid, becoming moderately acid at 30 cm. The subsoil is slightly acid.
SW38 Salinity
The salinity rating is very low throughout.
SW38 Clay
The clay content increases markedly at 55 cm depth.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
(dS/m)
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-15
6.1
5.4
0.08
6
0.4
0.2
0.05
A21
15-45
5.7
4.9
0.07
2.9
0.3
0.05
0.05
A22
45-55
6.4
5.6
0.05
1.4
0.9
0.05
0.05
B21
55-90
6.7
6
0.08
4.6
6
0.2
0.6
B22
90+
6.8
6
0.07
3.9
5.8
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)
A1
0-15
3.6
0.24
29
9.3
7
54
17
14
A21
15-45
27.4
6.7
9
55
18
14
A22
45-55
25.9
9.1
17
47
15
21
B21
55-90
10
52.8
31.4
2
12
5
78
B22
90+
48.4
27.5
3
18
9
72

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