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SW66

Location: Irrewillipe

Australian Soil Classification: Melacic - Mottled (& Reticulate), Eutrophic, Brown CHROMOSOL

General Landscape Description: Gently inclined undulating rises.
Site Description: Crest above gentle slope.
Geology: Tertiary Hanson Plain Sand

Image: SW66 Landscape
SW66 Landscape


Soil Profile Morphology:


Surface Soil


A10-35 cmVery dark grayish brown (10YR3/2 moist, 10YR5/2 dry); light fine sandy clay loam; weakly pedal; polyhedral (5-20 mm); very few (<2%), medium (2-10 mm) ironstone nodules; firm consistence; pH 5.3; clear and smooth change to:

South West Gasp Pipeline SW66 Profile
SW66 Profile. Note: Surface (A1) horizon has been stripped from the soil profile.
A235-55 cmYellowish brown (10YR5/4 moist), conspicuously bleached (10YR6/4 dry); sandy clay loam; apedal, massive; few (2-5%), medium (2-10 mm) ferruginous nodules; firm consistence; pH 5.5; abrupt and smooth change to:
Subsoil

B2155-95/105 cmStrong brown (7.5YR5/8 moist) to yellowish brown (10YR5/8 dry); with many (~30%) dark yellowish brown (10YR4/6 moist) to yellowish brown (10YR5/6 dry) mottles; light medium clay; strongly pedal, very coarse (50-100 mm) polyhedral, parting to medium (5-20 mm) fine to very fine (2-5 mm) polyhedral structure; common (~10%) medium (2-10 mm) ferruginous nodules; very firm consistence; pH 5.9; clear and wavy change to:

B22

95/105-110 cm

Yellowish red (5YR4/6 moist) and red (10R4/6 and 4/8 moist); light to medium clay; strongly pedal, coarse (20-50 mm), parting to medium to fine (5-20 mm) polyhedral structure; few (~5%) medium (2-10 mm) ferruginous nodules; very firm consistence; pH 6.0; clear smooth change to:

B23

110-130 cm

Thin (~5 mm) grayish brown (2.5Y5/2 moist) clay lamellae (10-20 mm apart) fringed horizontally by a dark yellowish brown (10YR4/6 moist and dry) sand matrix in a red (10R4/8 moist) ferruginised sand matrix; moderately pedal, coarse polyhedral (20-50 mm), parting to medium to fine (5-20 mm) polyhedral structure; very firm consistence; gradual and wavy change to:

B24

130-155 cm

Thick [up to 15 mm] light gray (10YR7/1 moist and dry) and brownish yellow (10YR6/8) clay lamellae (10-20 mm apart) in a red (10R4/8 moist) and brown (10YR4/3) ferruginised sand matrix; weakly pedal; medium to fine (5-20 mm) polyhedral structure; weak to firm consistence; abrupt and wavy change to:

C/B

155-200 cm

Thick [10-15 mm], clay lamellae (50-400 mm apart) in a ferruginised sand matrix; abrupt and smooth change to:

C

200 cm+

Mottled yellowish brown (10YR5/8 moist) and red (10R4/8 moist); ferruginised coarse sand.


South West Gasp Pipeline SW66 Tiger Mottles
Tiger Mottles


Key Profile Features:

  • Thick surface (A1) horizon.
  • Strong texture contrast between surface (A) horizons and subsoil (B2) horizon.
  • Deep tiger mottling with weathered Hanson Plain Sand visible at base.

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Subsoil
(B21 horizon)
Moderately Acid
Very Low
Non-Sodic
None
Deeper subsoil
(at 100-110+ cm)
Moderately Acid
Very Low
Non-Sodic
None


Image: SW66 Graphs

The surface is strongly acid. The subsoil is moderately acid.Salinity rating is very low throughout the profile.The soil is non sodic throughout.Exchangeable Aluminium levels are high in the surface soil.Clay levels jump markedly at the surface / subsoil boundary.

Horizon
Sampling Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
Organic Carbon
%
Nitrogen %
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-35
5.3
4.5
0.09
3.6
0.21
3.1
0.57
0.09
0.18
A2
35-55
5.5
4.6
<0.05
1.8
0.95
0.09
0.14
B21
55-100
5.9
5.3
0.07
2.9
7.1
0.12
0.37
B22
100-110
6
5.4
0.07
2.6
8.7
13
0.46

Horizon
Sampling 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)
A1
0-35
57
13
19.8
7.1
27.2
40.5
14.5
12.5
A2
35-55
43
6.8
17.7
7.3
22.5
40.3
11.5
23
B21
55-100
<10
12
36.4
25.7
9.5
14.1
6
70
B22
100-110
<10
12
40.9
28.3
9
9.2
6.5
75.5

Profile Described By: Richard McEwan (April 1999).
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