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SW60

Australian Soil Classification: Reticulate, Mesotrophic, Brown CHROMOSOLGeneral Landscape Description: Plateau of dissected Tertiary sediments - gently undulating plain
Site Description: Level to slightly sloping crestGeology: Hanson Plain Sand


Soil Profile Morphology:

Surface Soil


Ah0-25 cmVery dark greyish brown (10YR3/2 moist and dry); loamy sand, apedal, pH 5.1; abrupt and smooth boundary to:
South West Gasp Pipeline GP60 Profile
SW60 Profile
A225-40 cmBrownish yellow (10YR6/8); sandy clay loam; massive; pH 6.0; clear and wavy change to:
Subsoil

B21t40-70/90 cmLight olive brown (2.5Y5/3) ped exterior, yellowish brown (10YR5/6) to red (2.5YR5/8) interiors; medium clay; fine to coarse (5-30 mm) polyhedral structure; smooth ped faces; very firm consistence; pH 5.8; irregular and clear change to:
B/C70/90+ cmLight grey (2.5Y7/1) ped exterior, with yellowish brown (10YR5/8) to yellowish red (5YR5/6) interiors conspicuous coarse (50-100 mm) reticulate mottling; very coarse to coarse [30-100 mm] polyhedral, parting to medium to fine (5-30 mm) polyhedral structure; smooth faced peds; pH 5.5.

Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.

Soil Profile Characteristics:

pH
Salinity Rating
Sodicity
Dispersion
Surface
(A1 horizon)
Slightly Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Moderately Acid
Low
Non-Sodic
None
Deeper subsoil
(at 80+ cm)
Strongly Acid
Low
Non-Sodic
None

South West Gasp Pipeline GP60 Graphs
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-25
6.2
5.6
0.15
6.2
0.55
0.51
0.18
A2
25-40
6
5.4
0.08
1.8
0.92
0.24
0.09
B21
40-80
5.8
5.6
0.09
1.7
5
0.45
0.25
B22
80-105
5.5
5.1
0.08
0.82
4.7
0.17
0.33
Horizon
Horizon Depth
(cm)
Ex Al
mg/kg
Ex Ac
meq/100g
Field
pF2.5
Wilting Point
pF4.2
Coarse Sand
(0.2-2.0mm)
Fine Sand
(0.02-0.2mm)
Silt
(0.002-0.02mm)
Clay
(<0.002mm)
A1
0-25
<10
9.3
17.6
7.4
29
46
12
8
A2
25-40
<10
4.3
15.5
8.9
27
41
8
24
B21
40-80
<10
8
32.7
24.4
15
18
6
58
B22
80-105
<10
6.8
31.7
21.1
25
16
4
52


Management Considerations:

Subsoil (B) Horizons

  • The low exchangeable calcium:magnesium ratio in subsoil (0.4 in B21, 0.2 in B22) indicates that nutrient imbalances may occur (e.g. calcium deficiency).
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