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    1. Catchment Management Regions
      1. Mallee Region
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          4. Soils of the Nangiloc-Colignan Area
          5. Mallee Soil Pits
        4. Land and Water Management
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LWA7

Location: CowangieAustralian Soil Classification: Lithocalcic, Mottled-Mesonatric, Red SODOSOL
General Landscape Description: DepressionSite Description: Landcare delivery site
Geology:Quaternary aeolian deposits (Woorinen formation)

LWA7 landscape
LWA7 Landscape

Soil Profile Morphology:

Surface Soil

A10-18 cmDark brown (7.5YR3/3); sandy loam; apedal; weak consistence (dry); pH 8.4; clear change to:
LWA7 profile
LWA7 Profile
Subsoil

B118-40 cmBrown (7.5YR4/4); fine sandy clay loam; weak structure; firm structure (dry); pH 8.7; clear change to:
B21k40-60 cmYellowish red (5YR4/6) with brown (7.5YR4/4) mottles; light clay (sandy); very many (50%) soft and semi-hard calcareous nodules; pH 8.7; gradual change to:
B22k60-100 cmReddish brown (5YR4/4); light clay (sandy); moderate coarse to medium (10-50 mm) subangular blocky; very many (50%) soft and semi-hard calcareous nodules; pH 8.9; clear change to:
B23100+ cmReddish yellow (5YR6/6) with light brownish grey (10YR6/2) mottles; strong coarse (50-100 mm) prismatic, parting to strong coarse to medium (10-50 mm) blocky structure; few (5%) soft calcareous nodules; pH 9.1.


Key Profile Features:

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Moderately alkaline
Very high
Sodic
None 1
Subsoil
(B21 horizon 40-60 cm)
Strongly alkaline
Extremely high
Strongly sodic
None 1
Deeper subsoil
(100+ cm)
Very strongly alkaline
Extremely high
Strongly sodic
None 1
    1 Due to high levels of soluble salts.

LWA7 graphs

Horizon
Horizon Depth
pH (water)
pH CaCl2
EC
1:5
Org. Carbon
mg/kg
Exchangeable Cations
Ca
Mg
K
Na
Meq/100g
A1
0-18
8.4
8.0
1.1
1.3
8.1
1.3
1.7
1.1
B1
18-40
8.7
8.2
1.3
9.4
3.0
1.1
3.7
B21k
40-60
8.7
8.3
1.4
8.6
3.7
1.1
4.2
B22k
60-100
8.9
8.5
2.0
4.5
5.6
1.5
5.1
B23
100+
9.1
8.6
1.9
3.5
7.8
1.7
8.1

Horizon
Horizon Depth
Boron
mg/kg
Coarse Sand
(0.2-2.0mm)
%
Fine Sand
(0.02-0.2mm)
%
Silt
(0.002-0.02mm)
%
Clay
(<0.002mm)
%
A1
0-18
1.5
41
39
3
10
B1
18-40
1.4
33
30
9
22
B21k
40-60
3.3
32
27
10
22
B22k
60-100
18.0
27
16
5
27
B23
100+
21.0


Note:

  • Soil characterised by Jan 04.
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