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SW63

Location: Simpson.

Australian Soil Classification: Humose, Sesquic, Semiaquic PODOSOL (thick sandy surface/clay loamy subsoil).

General Landscape Description: Gently undulating plain.
Site Description: Flat Plain.
Geology: Hanson Plain Sand.
Land Use: Dairy cattle grazing.

Image: SW63 Landscape
SW63 Landscape


Soil Profile Morphology:

Surface Soil

Ah0-50 cmBlack (10YR2/1); loamy sand; apedal; weak consistence dry; many whitish sand grains; pH 5.1; abrupt and wavy change to:

NOTE: horizon becomes paler to dark grey (10YR4/1) at about 15 cm but the difference is not marked enough to be described as an A2.
Image: SW63 Profile
SW63 Profile.
Subsoil
B21sm50-52 cmDark brown (10YR3/3) to dark yellowish brown (10YR3/4); loam; weakly cemented thin pan; firm consistence dry; clear change to:

B22sg52-80/90 cm+Light olive brown (2.5Y5/3) with olive yellow (2.5Y6/6) mottles; loam; massive; firm consistence dry; pH 4.6; diffuse change to:

B23g80/90+ cmLight yellowish brown (2.5Y6/3) with slight yellowish brown (10YR5/8) mottles; loam; apedal; pH 4.6.

Key Profile Features
  • Thick organic matter rich surface (A1) horizon.

Soil Profile Characteristics:


pH


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


Image: SW63 Graphs
The surface is strongly acid. The subsoil is very strongly acid.Salinity rating is low throughout the profile.Exchangeable Aluminium levels are high throughout the profile.Clay levels jump markedly at the surface / subsoil boundary.

Horizon

Horizon Depth
(cm)

pH
(water)

pH
(CaCl2)

EC
(dS/m)
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A
0-50
5.1
3.9
0.12
2.8
0.52
0.55
0.31
B22sg
50-85
4.6
4.4
0.1
0.09
0.1
<0.05
0.23
B23g
85+
4.6
4.2
0.07
<0.05
0.17
<0.05
0.16
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)
A
0-50
6.8
0.34
59
19
23
11
26
43
15
3
B22sg
50-85
160
11
18
8
17
47
16
17
B23g
85+
170
4.9
14
5
18
48
19
16

Management Considerations:

Subsoil (B) Horizons
  • High level of exchangeable aluminium in very strongly acid subsoil.
  • Low level of inherent fertility.
Profile Described By: Mark Imhof and Richard MacEwan (March 1999).
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