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SW88

Location: WinchelseaAustralian Soil Classification: Vertic (& Calcareous), Sodosolic, Redoxic, HYDROSOL
General Landscape Description: Gently undulating rises on basalt plainSite Description: Low lying flat depression in minor alluvium
Geology: Quaternary-Newer Volcanics

South West Gasp Pipeline GP88 Landscape
SW88 Landscape


Soil Profile Morphology:


Surface Soil


A10-8 cmDark brown (10YR3/3 moist and 10YR4/2 dry); fine sandy loam, weakly pedal; firm consistence; pH 5.7:
South West Gasp Pipeline GP88 Profile
SW88 Profile - Note: Surface horizons have been stripped from the soil profile
A28-15/18 cmPossible A2 (incipient) but not clear in trench; abrupt change to:
Subsoil
B21g15/18-50 cmVery dark brown (10YR2/2 moist) with greyish brown (10YR5/2 moist) and brownish yellow (10YR6/8 moist) (50%) gleyed interiors; sandy light clay in upper part of horizon to light medium clay, [sandy] deeper down and in ped interiors; very coarse (>150 mm) prismatic structure; massive; firm to very firm consistence; pH 8.1; clear or gradual change to:
B22g50-80 cmDark grey (10YR4/1 moist) with many (>50%) grey (10YR5/1 moist) and yellow (10YR7/8) mottles; medium clay; fine pedal structure, polyhedral to very fine lenticular structure, shiny ped faces; pH 8.7; clear or gradual change to:
B23gt80-110 cmBlack (10YR2/1 moist) ped faces; many (~80%), pinkish grey (7.5YR6/2 moist) and brownish yellow (10YR6/8) mottles; medium clay; structure tending to medium (<50 mm) prismatic; pH 8.9; clear change to:
B24g110-180 cm+Greyish green (5G4/2 moist) and light olive brown (2.5Y5/3 moist), strongly gleyed; sandy clay; fine yellowish brown (10YR5/8 moist) mottles; apedal; strongly developed large (~10 mm) biopores, 50-120 mm apart; minor (<2%), soft calcium carbonate (CaCO3) and isolated calcium carbonate (CaCO3) nodules; pH 8.3.


South West Gasp Pipeline GP88 Gley detail showing biopores and redoximorphic features (B24g horizon)
Gley detail showing biopores and redoximorphic features (B24g horizon)


Key Profile Features:

  • Shallow surface horizons.
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
  • Vertic features (i.e. lenticular peds) in deeper subsoil.

Soil Profile Characteristics:

pH
Salinity Rating
Sodicity
Dispersion
Surface
(A1 horizon)
Moderately Acid
Medium
Non-Sodic
None
Subsoil
(B21 horizon)
Moderately Alkaline
High
Strongly Sodic
Slight1
Deeper subsoil
(at 90-105 cm)
Strongly Alkaline
Extremely High
Strongly Sodic
None2
1 strong dispersion after remoulding
2 probably due to high level of soluble salts.

South West Gasp Pipeline GP88 Graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-10
5.7
5
0.28
0.03
4.4
3.9
0.9
0.2
B21
30-50
8.1
7.4
0.76
0.16
3.1
10
0.8
2.7
B22
60-80
8.7
8.2
1.4
0.33
3.1
14
1
5.1
B23
90-105
8.9
9.3
1.2
0.3
23
11
0.5
4
B24
110-150
8.3
8.5
0.67
0.14

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
<10
10
18.3
10.3
23.3
49
8.5
13.5
B21
30-50
29.9
14.4
16.6
45
5.5
31
B22
60-80
37.5
18.3
10.1
43.1
7.5
37.5
B23
90-105
31.2
14.2
25.8
37.7
4
30.5
B24
110-150


Management Considerations:

Whole Profile

  • The profile is likely to be saturated for a number of months during most years.

Subsoil (B) Horizons
  • The high level of soluble salts in the subsoil is likely to restrict the growth of salt sensitive species.


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