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SW71

Australian Soil Classification: Bleached-Vertic (& Mottled), Magnesic, Brown CHROMOSOLGeneral Landscape Description: Undulating low hills
Site Description: Waxing upper slopeGeology: Otway Group, (volcanogenic sandstone)

South West Gasp Pipeline GP71 Landscape
SW71 Landscape


Soil Profile Morphology:

Surface Soil


A10-20 cmDark grey (10YR4/1 moist), greyish brown (10YR5/2 dry), fine sandy loam; moderately pedal; weak to firm consistence; pH 5.5:
South West Gasp Pipeline GP71 Profile
SW71 Profile
A2e20-50/60 cmLight brownish grey (2.5Y6/2 moist), conspicuously bleached (2.5Y8/1 dry); fine sandy loam; hard setting; common (<20%), fine ferromanganiferous gravel (mostly not magnetic) sporadic and not in thick layer; very firm consistence; clear to gradual change (incipent B1) to; pH 5.8:
Subsoil

B21ss50/60-100/120 cmDark yellowish brown (10YR3/4 moist and dry); many (~25%), faint, fine to coarse (5-20 mm) yellow brown/ dark red mottles; heavy clay; coarse (50-120 mm) prismatic, parting to thick lenticular or angular blocky structure; slickensides; diffuse yellower change to; pH 6.0:
C/B120 cm+Brownish yellow (10YR6/8 moist) to yellow (10YR8/8 dry); fine sandy with white (10YR8/1 moist) and very dark grey (5YR3/1 moist) ped faces; below 150 cm, extremely hard to break with geopick; cemented ferruginised sandstone.

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

Soil Profile Characteristics:

pH
Salinity Rating
Sodicity
Dispersion
Surface
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Moderately Acid
Very Low
Non-Sodic
None

South West Gasp Pipeline GP71 Graphs
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10
5.5
4.7
0.12
3.2
2.1
0.23
0.35
A2
30-50
5.8
4.7
<0.05
0.67
0.96
<0.05
0.17
B21
65-85
6
4.9
0.1
1.2
12
0.15
1.4
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
23
14
33.5
11.4
9.5
38
26.5
18
A2
30-50
23
6.2
19.1
6.8
7.8
44.5
24
23.5
B21
65-85
19
13
43
27
1.4
11.4
7
79.5


Management Considerations:

Notes

  • Soils showing increasing vertic properties downslope.


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