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Site SW21

Location: Simpson Australian Soil Classification: Humose-Acidic, Dystrophic, Grey DERMOSOL
General Landscape Description: Grazing paddock (dairy).Geology: Tertiary - Moorabool Viaduct Formation.
Mapping Unit: Simpson Land System (Pitt, 1981).Site Description: Gently undulating plain 'grass-tree country'.

Image: SW21 Landscape
Site SW21 Landscape


Soil Profile Morphology:

Surface Soil

A10-20 cmBlack (10YR2/1); fine sandy loam; weak coarse blocky, parting to medium blocky structure; weak to firm consistence moist; pH 4.9; clear change to:

Image: SW21 Profile
Site SW21 profile photo.
A220-40 cmDark greyish brown (10YR4/2); light fine sandy clay loam; weak to moderate medium polyhedral structure; firm consistence moist; very few (<1%) ferromanganiferous nodules (5 mm size); some rusty root channel mottling present; pH 4.8; clear change to:

Subsoil

B140-60 cmDark greyish brown (10YR4/2) with yellowish brown (10YR5/8) and light yellowish brown (10YR6/4) mottles; fine sandy clay loam; weakly structured; very firm consistence moist; pH 4.8; gradual change to:

B2160-90 cmLight brownish grey (10YR6/2) with yellowish brown (10YR5/8) mottles; light clay; weak to moderate coarse blocky, parting to medium blocky structure; firm consistence moist; pH 4.7; gradual change to:

B2290+ cmLight brownish grey (10YR6/2) with yellowish brown (10YR5/8) mottles; light medium clay; weak to moderate coarse blocky, parting to medium blocky structure; very few (1%) iron nodules (5-10 mm size) and quartz fragments (2-3 mm size); pH 4.6.

Key Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Very Strongly Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Very Strongly Acid
Very Low
Non-Sodic
None
Deeper subsoil
(at 90+ cm)
Very Strongly Acid
Very Low
Non-Sodic
None
Image: SW21 Graphs
Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-20
4.9
4.3
0.22
6.2
0.7
0.4
0.1
A2
20-40
4.8
4.1
0.1
0.7
0.5
0.05
0.05
B1
40-60
4.8
4.2
0.08
0.4
0.3
0.05
0.05
B21
60-90
4.7
4.1
0.08
0.3
0.4
0.05
0.05
B22
90+
4.6
4
0.1
0.3
0.6
0.05
0.05

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
0-20
31
20
26
36
11
10
A2
20-40
19
8
25
40
15
14
B1
40-60
18
7
26
40
14
17
B21
60-90
20
8
24
39
10
24
B22
90+
22
11
21
34
15
31

Profile Described By: Mark Imhof and Austin Brown, August 1998.
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