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SW70

Location: Tulloh

Australian Soil Classification: Humose, Sesquic, Semiaquic PODOSOL

General Landscape Description: Undulating low hills
Site Description: Waxing upper slope
Geology: Ambiguous: Hanson Plain Sand, Dilwyn Formation (Colac 1:250 000), or Eastern View Formation (Colac 1:50 000)

Image: SW70 Landscape
SW70 Landscape


Soil Profile Morphology:


Surface Soil


Ap0-20/30 cmVery dark grayish brown (10YR3/2 moist), grayish brown (10YR5/2 dry); loamy sand; apedal; pH 5.3; diffuse change to:
South West Gasp Pipeline SW70 Profile
SW70 Profile. Note: Surface (A1) horizon has been stripped from the soil profile
A220/30-90/110 cmGrayish brown (10YR5/2 moist), conspicuously bleached (10YR7/2 dry); sand; sporadic gravel band (>100 mm); with very many medium to coarse (5-15 mm) nodules with dark 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 gray (5GY7/1 moist) (50%); very dark grayish 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 gray (5GY7/1 moist) (70%); apedal.

Key Profile Features:
  • Very thick conspicuously bleached subsurface (A2) horizon.

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(Ap horizon)
Strongly Acid
Moderate
Non-Sodic
None
Subsoil
(A2 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Deeper Subsoil
(100+ cm)
Moderately Acid
Very Low
Non-Sodic
None


Image: SW70 Graphs

The surface and upper subsoil is strongly acid. The deeper subsoil is moderately acid.Salinity rating is moderate in the surface becoming very low in the subsoil.
    The soil is non sodic throughout.
The clay content is quite low throughout the profile.


Horizon
Sample Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
Nitrogen
%
Organic Carbon
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
Ap
0-10
5.3
4.6
0.25
0.31
3.2
2
1.1
0.44
0.72
A2
30-50
5.4
4.6
0.07
0.27
0.13
<0.05
0.18
B21s
100+
5.8
4.9
0.08
1.3
1.9
0.09
0.33

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)
Ap
0-10
15
9.9
15.1
6.8
50
32
9
5
A2
30-50
11
2.1
8.2
1.2
48
38
8
5
B21s
100+
<10
4.1
12
6
46
32
4
18


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.

Profile Described By: Richard McEwan (April 1999).
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