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SW72

Location: Tulloh

Australian Soil Classification: Bleached-Vertic, Magnesic, Brown CHROMOSOL

General Landscape Description: Undulating low hills.
Site Description: Mid slope, simple slope.
Geology: Otway Group (volcanogenic sandstone).

Image: SW71 Landscape
SW72 Landscape is behind the camera.


Soil Profile Morphology:

Surface Soil


A10-20 cmVery dark gray (10YR3/1 moist), gray (10YR5/1 dry); fine sandy clay loam, moderately pedal, crumb; weak to firm consistence dry; pH 5.3:
South West Gasp Pipeline SW72 Profile
SW72 Profile. Note: Surface (A1) horizon has been stripped from the soil profile
A220-45/50 cmLight brownish gray (10YR6/2 moist), conspicuously bleached (10YR7/1 dry); fine sandy loam; apedal; hardsetting; very firm consistence dry; fine (<10 mm) ferruginous gravel (some magnetic), up to 50% or more, in lower 100 mm; pH 6.0; sharp and slightly wavy change to:
Subsoil

B21tss45/50-100/120 cmDark brown (10YR3/3 moist, dry); few (<10%), fine red and fine yellow mottles, red mottles becoming prominent [up to 30%] and larger (~10 mm) with depth, yellow fringes; medium clay to medium heavy clay; coarse prismatic and coarse lenticular structure, [becoming coarser with depth]; larger (>300 mm) slickensides underlying several peds; pH 6; clear/gradual change to:
B22t100/120-140/150 cmMottled yellowish red (5YR5/8 moist) or brownish yellow (10YR6/8 moist) and white peds with black (5Y2.5/1) clay coatings on ped faces; medium heavy clay; medium prismatic to angular blocky (30-50 mm) peds with sandier matrix in interior; strong consistence dry; pH 5.4; gradual change to:
C/B140/150 cm+Red and white mottled, fine weathered sandstone with black clay and organic coatings in cracks.

Key Profile Features:
  • Conspicuously bleached subsurface (A2) horizon.
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
  • Slickensides in subsoil.

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Moderately Acid
Very Low
Non-Sodic
None
Deeper subsoil
(at 150+ cm)
Strongly Acid
Very Low
Non-Sodic
None


Image: SW72 Graphs

The surface soil is strongly acid. The deeper subsoil is moderately acid.Salinity rating is low in the surface becoming very low in the subsoil.
    The soil is non sodic throughout.
Exchangeable Aluminium levels are high in the deeper subsoil.The clay content increases markedly at the A/B boundary.

Horizon
Sample Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
Nitrogen
%
Organic Carbon
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10
5.3
4.5
0.1
0.34
4.4
2.8
1.9
0.28
0.32
A2
30-45
6
5
<0.05
0.72
1.5
<0.05
0.19
B21
60-80
6
4.9
0.11
1.4
12
0.18
1.1
B22
120-140
5.4
4.4
0.1
0.29
7.8
0.12
0.93
Horizon
Sample 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
57
16
30.4
11.5
12
38
28
14
A2
30-45
<10
6.2
17.9
7
17
46
16
15
B21
60-80
22
13
41.1
26.3
3
12
9
72
B22
120-140
190
12
34.3
20.4
4
18
15
62


Management Considerations:

Subsoil (B) Horizons

  • This subsoil has a very low ratio of exchangeable calcium relative to exchangeable magnesium (i.e. magnesic).
  • The strongly acid deeper subsoil has high levels of exchangeable calcium.

Profile Described By: Richard McEwan (April 1999).
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