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Site SW65

Location: Simpson.Australian Soil Classification: Reticulate, Mesotrophic, Brown CHROMOSOL.
General Landscape Description: Gently undulating plain (plateau).Site Description: Flat plain above a gentle slope. Landuse is 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:

Image: GP65 Profile
Site SW65 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:
  • A further profile was photographed 200 m east of SW65 . 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.

Key Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Subsoil
(25-45 horizon)
Moderately Acid
Very Low
Non-Sodic
None
Deeper subsoil
(65-100 cm)
Moderately Acid
Very Low
Non-Sodic
None
Image: GP65 Graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
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)
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
7
24
47
14
9
B1
15-40
<10
5.7
20
9
20
42
12
26
B22
65-100
<10
9.1
34
23
10
20
5.
63

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