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Site SW23

Location: SimpsonAustralian Soil Classification: Acidic, Mesotrophic, Brown DERMOSOL
General Landscape Description: Grazing paddock (dairy).Mapping Unit: Tomahawk Creek Land System (Pitt, 1981).
Site Description: Creek Terrace.Geology: Tertiary - Moorabool Viaduct Formation.

Image: SW23 Landscape
Site SW23 landscape


Soil Profile Morphology:

Surface Soil

A10-10 cm Dark brown (10YR3/3); fine sandy clay loam; weak consistence moist; pH 5.6; abrupt change to:

Image: SW23 Profile
Site SW23 profile photo.
A210-25 cmLight brownish grey (10YR6/2); silty clay loam; weak coarse blocky structure; rusty root channel mottling present; pH 5.4; clear change to:

Subsoil
B125-40 cmLight yellowish brown (2.5Y6/4) with reddish yellow (7.5YR6/6) mottles; heavy silty clay loam; weak to moderate coarse blocky structure; pH 5.2; clear change to:

B2140-70 cmBrown (10YR5/3) with reddish yellow (7.5YR6/6) mottles; silty clay; moderate coarse blocky, parting to strong medium polyhedral structure; pH 5.0; clear change to:

B2270+ cmLight brownish grey (10YR6/2) with brownish yellow (10YR6/6); light medium clay; weak very coarse prismatic, parting to strong coarse blocky and strong fine to medium polyhedral structure; pH 5.0.

Key Profile Features:
  • Gradual increase in texture (clay percentage) down the soil profile.

Key Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Moderately Acid
Very low
Non-sodic
none
Subsoil
(B21 horizon)
Strongly Acid
Very low
Non-sodic
none
Deeper subsoil
(at 70+ cm)
Strongly Acid
Very low
Non-sodic
none
Image: SW23 Graphs
Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10
5.6
4.9
0.15
5.4
1.1
0.2
0.1
A2
10-25
5.4
4.6
0.1
1.9
0.8
0.3
0.05
B1
25-40
5.2
4.3
0.11
1.7
1.3
0.3
0.1
B21
40-70
5
4.2
0.13
1.8
1.8
0.3
0.2
B22
70+
5
4.2
0.15
2.2
3.9
0.3
0.3

Horizon
Horizon Depth
(cm)
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
0-10
36
13
5
43
25
16
A2
10-25
26
8
2
50
30
16
B1
25-40
27
11
2
47
26
25
B21
40-70
29
13
2
42
26
30
B22
70+
31
17
1
35
21
42

Profile described by: Mark Imhof and Austin Brown, August 1998.
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