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SW65

Location: SimpsonAustralian 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


Soil Profile Morphology:

Surface Soil


Ap0-15 cmVery dark greyish brown (10YR3/2 moist), dark greyish brown (10YR4/2 dry); loamy fine sand; apedal; very weak consistence; pH 5.3; diffuse change to:
South West Gasp Pipeline GP65 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+ Grey (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:
  • Further profile 200 m east of GP 65 was photographed. This had similar overall characteristics but also had very strongly cemented, ferruginised coarse sand at 1.5 m plus.
  • 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
Sodicity
Dispersion
Surface
(A1 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Subsoil
(B2 horizon)
Moderately Acid
Very Low
Non-Sodic
None
Deeper subsoil
(at 65-100 cm)
Moderately Acid
Very Low
Non-Sodic
None

South West Gasp Pipeline GP65 Graphs
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10
5.3
4.7
0.12
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
1.6
6.4
0.15
0.55
Horizon
Horizon Depth
(cm)
Ex Al
mg/kg
Ex Ac
meq/100g
Field
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
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