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SW56

Location: Cooriemungle.

Australian Soil Classification: Melacic, Humic/Sesquic, Semiaquic PODOSOL
Great Soil Group: podzol

General Landscape Description: Convex rise on valley floor within a dissected plain.
Geology: Quaternary alluvium derived from Hanson Plain Sand.
Land Use: Dairy cattle grazing.

Image:  SW55  and 56 LandscapeSW56 Landscape

Soil Profile Morphology:

Surface Soil

A1 0-20 cmBlack (10YR2/1); sandy loam; weak fine to medium polyhedral structure; weak consistence dry; pH 5.1; abrupt and smooth change to:

Image:  SW56 Profile SW56 Profile.
Note: Surface (A) horizon has been stripped from the soil profile.
A2e20-30/40 cmGreyish brown (10YR5/2) conspicuously bleached (10YR8/1 dry); fine sandy clay loam; massive; firm consistence dry; pH 4.8; abrupt and wavy change to:

Subsoil

B21h30/40-35/45 cmBlack (10YR2/1); fine sandy clay loam; massive; clear and wavy change to:

B22s35/45-80 cmOlive yellow (2.5Y6/8); fine sandy clay loam; massive; strong consistence dry; pH 5.1; gradual and smooth change to:

B23g80+ cmGrey (2.5Y5/1) with yellowish brown (10YR5/8) mottles common; medium clay; medium prismatic, parting to coarse blocky, parting to medium blocky structure; firm to very firm consistence dry; pH 4.9.

Key Profile Features:
  • Presence of humic and sesquic horizons in the upper subsoil which has probably developed within an older soil profile i.e. Kurosol.
Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None
Subsoil
(Bs horizon)
Strongly Acid
Very low
Non-Sodic
None
Deeper Subsoil
(at 80+ cm)
Very Strongly Acid
Very low
Non-Sodic
None

Image:  SW56 Graphs
The surface and upper subsoil is stronglyly acid. The subsoil is very strongly acid.Salinity rating is low in the surface becoming very low in the subsoil.Clay content increases markedly at the surface / subsoil boundary.Exchangeable Aluminium increases to very high levels in the subsoil.

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
(dS/m)
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-20
5.1
4.6
0.37
0.02
7
0.9
0.7
0.2
A2
20-30/40
4.8
4.1
0.06

0.82
0.11
<0.05
<0.05
Bs
30/40-80
5.1
4.7
0.06
0.35
0.12
0.16
0.06
Bg
80+
4.9
4.1
0.06
0.08
2
0.14
0.2

Horizon
Horizon Depth
(cm)
Oxidisable
Organic Carbon
%
Total
Nitrogen
%
Exchangeable Aluminium
mg/kg
Exchangeable Acidity
meq/100g
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
10.0
0.71
<10
19
43
20
17
38
23
4
A2
20-30/40
<10
2
16
2
11
42
36
5
Bs
30/40-80
110
19
6
27
26
32
Bg
80+
280
12
8
21
27
43

Management Considerations:

Subsoil (B) Horizons
  • The strongly to very strongly acid subsoil indicates that aluminium and manganese toxicity may occur. The exchangeable aluminium levels measured in the laboratory are quite high in the subsoil and may affect the growth of aluminium sensitive species.

Profile Described By: Mark Imhof and Richard MacEwan (April 1999).
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