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SFS9b

Location: Woodhouse, Torino
Aust. Soil Class.:Vertic (& Ferric), Mottled-Subnatric, Brown SODOSOL

General Landscape Description: Flat gently sloping side of broad depression
Site Description: 'Puff' component of gilgai microrelief

Image:  SFS 9a & 9b landscape
SFS 9b

Soil Profile Morphology:

Surface Soil
A10-8/10 cmDark greyish brown (10YR 4/2 moist) with greyish brown (10YR 5/2 dry); loam; weak consistence; apedal; rusty root channel mottling; pH 5.0; clear and wavy change to:
A210-30 cmConspicuously bleached (10YR 8/2 dry) at base of horizon; loamy gravel; very abundant (~90%), fine (5-10 mm) buckshot; pH 6.5; abrupt change to:
Subsoil
B21tss30-100 cm+Dusky red (2.5Y 4/4) with abundant (~50%), faint yellowish brown (10YR 5/6-6/6) mottles; fine polyhedral peds; few fine buckshot; slickensides at depth; pH 6.8.

Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
  • Conspicuously bleached surface (A2) horizon.
  • Abundant ‘buckshot’ gravel in subsurface (A2) horizon.

Soil Profile Characteristics:


pH
Salinity Rating
Surface
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None1
Subsoil
(B21 horizon)
Slightly Acid
Very Low
Marginally Sodic
None2
Deeper subsoil
(at 1 m)
Slightly Acid
Low
Sodic
None2
1 slight dispersion after remoulding 2 strong-complete dispersion after remoulding
Image:  SFS 9b graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
NaCl
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
8-10
5
4.4
0.15
4.2
1.6
0.22
0.35
A2
10-30
6.5
6
<0.05
2.7
1.4
0.13
0.26
B21tss
40-70
6.8
6.4
0.08
5.1
10
0.27
2.1
B22
100+
6.8
6.5
0.21
4.5
11
0.27
3.3

Horizon
Horizon 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
8-10
37
14
34.6
12.1
5
38.6
27.5
20
A2
10-30
5.2
20.3
7.5
31.2
29.8
23.5
16
B21tss
40-70
12
45.1
27.9
2.6
13.4
8.5
69.5
B22
100+
11
45.4
29.8


Management Considerations:

Whole Profile

Notes
  • This site had more earthworms than we have seen at any other SFS site.
  • Pit excavated ~100 m west of NE gate into paddock. Duplex soil with buckshot gravel. SFS9a hollow and SFS9b is puff. Generally yellow clay in puff, ~30 cm to B, A2 full of buckshot. Greyer soil in hollow, ~60 cm to B, buckshot only in lower 10 cm of A2 (generalisation made on one pit).
  • Soil profile described by Richard MacEwan, May 1999.

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