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LWA10

Australian Soil Classification: Vertic & (Bleached-Ferric), Red CHROMOSOL


Soil Profile Morphology:

Surface Soil


Ap0-6 cmBrown (7.5YR4/2); heavy sandy loam; moist consistence; pH 5.6; clear change to:
South West Gasp Pipeline LWA Profile
LWA10 Profile

A12
6-15 cm
Brown (7.5YR4/3); light sandy clay loam; pH 4.6; clear change to:

A21
15-25 cm
Brown (7.5YR4/4); firm to very firm consistence (dry); very many (50 - 90%) ferro-manganiferous concretions (2 – 8 mm); pH 4.7; gradual change to:

A22		25-45 cm
Brown (7.5YR5/4) with pink (7.5YR8/3) mottles; very many (80%) ferro-manganiferous concretions; pH 5.5; clear change to:

Subsoil

B245-65 cmYellowish red (5YR4/6) with light reddish brown (2.5YR6/4) and reddish brown (2.5YR4/6) mottles; medium clay; moderate coarse (50-100 mm) prismatic, parting to strong medium to fine (5-20 mm) polyhedral structure; firm to very firm consistence (dry); pH 5.9; clear change to:

2B2
65-80 cm
Brown (10YR5/3) with strong brown (7.5YR5/8) and white (10YR8/1) mottles; light clay (fine sandy); strong consistence (dry); many (40%) ferro-manganiferous nodules (2-5m); slight manganese staining; pH 6.6; clear change to:

3B2
80-105 cm
Light yellowish brown (2.5Y6/3) with strong brown (7.5YR5/8), greyish brown (2.5Y5/2) and yellowish red (5YR4/6) mottles; heavy clay; strong coarse (50-100 mm) prismatic, parting to strong coarse (20-50 mm), further parting to coarse (20-50 mm) lenticular structure; firm to strong consistence (dry); shiny ped faces; manganese staining common (20%); pH 8.1; gradual change to:

4B2
105-130+ cm
Light yellowish brown (2.5Y6/3) with yellowish red (5YR5/6) mottles; medium clay; moderate fine (10-20 mm) prismatic structure; firm to very firm consistence (moist); few (5%) manganese staining; few (2%) ferro-manganiferous nodules (5-10 mm); pH 8.6.

Key Profile Features:

Soil Profile Characteristics:

pH
Salinity Rating
Sodicity
Dispersion
Surface
(A1 horizon)
Moderately Acid
Low
None1
Subsoil
(B2 horizon)
Moderately Acid
Very Low
None
Deeper subsoil
(at 105-130+ cm)
Strongly Alkaline
Very Low
Strong
1 Slight dispersion after remoulding

South West Gasp Pipeline LWA Graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
Ap
0-6
5.6
5.4
0.29
3.0
A12
6-15
4.6
4.3
0.17
1.9
1.3
0.53
0.86
0.19
A21
15-25
4.7
4.3
0.13
0.68
0.36
0.71
0.21
A22
25-45
5.5
5.1
0.12
1.6
0.68
0.58
0.29
B2
45-65
5.9
5.2
0.19
3.9
6.5
1.4
1.8
B3
65-80
6.6
5.6
0.10
1.6
3.6
0.70
1.5
B4
80-105
8.1
6.8
0.23
5.8
13
2.3
6.8
B5
105-130+
8.6
7.6
0.18
4.9
11
1.6
5.5

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)
Ap
0-6
24.3
7.2
22
42
16
16
A12
6-15
22.6
6.2
24
42
11
19
A21
15-25
19.7
6.2
31
39
12
16
A22
25-45
20.3
7.6
35
34
12
18
B2
45-65
51.9
28.2
3
11
7
79
B3
65-80
28.1
10.6
13
39
16
29
B4
80-105
55.8
31.5
3
7
4
84
B5
105-130+
38.5
20.6
12
26
7
51


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