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Site SW56

Location: Cooriemungle.Australian Soil Classification: Melacic, Humic/Sesquic, Semiaquic PODOSOL (Magnesic, Grey Kurosol).
Great Soil Group: podzolGeneral Landscape Description: Convex rise on valley floor within a dissected plain.
Geology: Quaternary alluvium derived from Hanson Plain Sand.

Image:  GP55  and 56 Landscape
Site SW56 Landscape


Soil Profile Morphology:

Surface Soil

A1 0-20 cmBlack (10YR2/1 moist, 10YR4/1 dry); sandy loam; weakly pedal, polyhedral (5-20 mm in size); weak consistence; pH 5.1; abrupt smooth change to:

Image:  GP56 Profile
Site SW56 profile
A2e20-30/40 cmGreyish brown (10YR5/2 moist), conspicuously bleached (10YR8/1 dry); fine sandy loam; apedal, massive; firm consistence; pH 4.8; abrupt and wavy change to:

Subsoil

B21h30/40-35/45 cmBlack (10YR2/1 moist and 10YR3/1 dry); fine sandy clay loam; apedal, massive; clear and wavy change to:

B22s35/45-80 cmOlive yellow (2.5Y6/8 moist) with light red (2.5YR7/6 dry) mottles; fine sandy clay loam; apedal, massive; strong consistence; pH 5.1; gradual and smooth change to:

B23g80 cm+Grey (2.5Y5/1) with (10-15%) yellowish brown (10YR5/8 moist) mottles common; medium clay; medium (20-50 mm in size) prismatic, parting to coarse (20-50 mm in size) and medium (10-20 mm in size) blocky structure; firm to very firm consistence; 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.
Key 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:  GP56 Graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
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
4.8
4.1
0.06
0.82
0.11
<0.05
<0.05
Bs
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)
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
19
43
20
17
38
23
4
A2
20-30
<10
2
16
2
11
42
36
5
Bs
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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