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SW70

Australian Soil Classification: Humose, Sesquic, Semiaquic PODOSOLGeneral Landscape Description: Undulating low hills
Site Description:Waxing upper slopeGeology: Ambiguous: Hanson Plain Sand, Dilwyn Formation (Colac 1:250 000), or Eastern View Formation (Colac 1:50 000)

South West Gasp Pipeline GP70 Landscape
SW70 Landscape


Soil Profile Morphology:


Surface Soil


Ap0-20/25 cmVery dark greyish brown (10YR3/2 moist), greyish brown (10YR5/2 dry); loamy sand; apedal; pH 5.3; diffuse change to:
South West Gasp Pipeline GP70 Profile
SW70 Profile
A230-90/110 cmGreyish brown (10YR5/2 moist), conspicuously bleached (10YR7/2 dry); sand; sporadic gravel band (>100 mm); with dark very medium to coarse (5-15 mm) nodules with manganiferous centres; very weak to weak consistence; pH 5.4; abrupt change to:
Subsoil

B21s90/110-150 cmBrown (7.5YR4/4 moist and dry) and brownish yellow (10YR6/8 moist) to yellow (10YR7/8 dry); sandy clay loam; cemented sand, ("coffee rock"); massive; firm to strong consistence; clear change to:
B22g150-200 cmYellowish brown (10YR5/8 moist) (50%) and light greenish grey (5GY7/1 moist) (50%); very dark greyish brown (10YR3/2 moist) coatings; sandy light clay; pH 6; clear change to:
B23200 cm+ Mottled yellowish brown (10YR5/8 moist) (30%) and light greenish grey (5GY7/1 moist) (70%); apedal.

Key Profile Features:
  • Very thick conspicuously bleached subsurface (A2) 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
Deeper Subsoil
(85 cm)
Moderately Acid
Very Low
Non-Sodic
None

South West Gasp Pipeline GP70 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
4.6
0.25
2
1.1
0.44
0.72
A2
30-50
5.4
4.6
0.07
0.27
0.13
<0.05
0.18
BS
65-85
5.8
4.9
0.08
1.3
1.9
0.09
0.33

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
15
9.9
15.1
6.8
48.9
32.3
9
5
A2
30-50
11
2.1
8.2
1.2
47.8
38.3
8
4.5
BS
65-85
<10
4.1
12
6
45.8
31.8
3.5
17.5


Management Considerations:

Notes

  • The area is mapped as Tad and Klp but there are great similarities between Tpb and some of the soil profiles. This question needs to be resolved, particularly the Fe sandstone/Fe gravel/Fe colluvial content. Area between creeks is mapped as Klp but soil is same as that East of Christies-Colac Road. General trend is for gravel to disappear from the A2 on these slopes here and for the subsoil structure to become larger, A2/B more variable, more gleyed and strong vertic features.


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