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SW65

Location: Simpson

Australian Soil Classification: Reticulate, Mesotrophic, Brown CHROMOSOL

General Landscape Description: Gently undulating plain (plateau).
Site Description: Flat plain above gentle slope, dairy pasture.
Geology: Hanson Plain Sand

Image: SW65 Landscape
SW65 Lanscape


Soil Profile Morphology:


Surface Soil


Ap0-15 cmVery dark grayish brown (10YR3/2 moist), dark grayish brown (10YR4/2 dry); loamy fine sand; apedal; very weak consistence; pH 5.3; diffuse change to:
Image:  SW65 Profile
SW65 Profile

Note: Surface (Ap) horizon has been stripped from soil profile
Subsoil

B115-40 cmDark yellowish brown (10YR4/6 moist), yellowish brown (10YR5/8 dry); clay loam, moderate root channels; firm consistence; pH 5.7; clear change to:
B2140-65 cmDark yellowish brown (10YR4/6 moist), yellowish brown (10YR5/8 dry); sandy clay loam; moderately pedal; diffuse change to:
B2265-100 cmDark yellowish brown (10YR4/6 moist and dry); medium to heavy clay; slight, strong brown (7.5YR4/6 moist) mottling; very friable; very firm consistence; pH 5.8; gradual change to:
BC100 cm+ Gray (N6/1 moist) and dusky red (7.5R3/4 moist), red (10R4/8 moist) and yellowish brown (10YR5/8 moist) reticulate mottling ("Tiger Mottles"); medium to heavy clay.

Notes:
  • A further profile 200 m east of SW65 was photographed. This had similar overall characteristics but also had very strongly cemented, ferruginised coarse sand at 1.5 m plus. There was little or no ironstone in the upper part of the profile however.
  • A2 or B1 horizons are an irregular feature of this soil.

Key Profile Features:
  • Strong texture contrast between upper horizons and subsoil (B21) horizon.

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Subsoil
(B1 horizon)
Moderately Acid
Very Low
Non-Sodic
None
Deeper subsoil
(at 65-100 cm)
Moderately Acid
Very Low
Non-Sodic
None


Image:  SW65 Graphs

The surface is strongly acid. The subsoil is moderately acid.Salinity rating is low throughout the profile.The soil is non sodic throughout.Exchangeable Aluminium levels are high in the subsoil.

Horizon
Sampling Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
Organic Carbon
%
Nitrogen %
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10
5.3
4.7
0.12
6.5
0.21
2.8
0.3
0.19
0.1
B1
15-40
5.7
5.1
0.06
1.9
1.4
0.1
0.11
B22
65-100
5.8
5.3
0.07
1.3
6.4
0.15
0.55

Horizon
Sampling 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
0-10
39
11
19.2
7
24.2
46.6
14
9
B1
15-40
<10
5.7
20.3
8.9
19.6
42.2
11.5
25.5
B22
65-100
<10
9.1
34.1
23.3
10
20.3
5.
63


Profile Described By: Richard McEwan (March 1999).
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