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      1. Corangamite Region
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          1. Declared Special Water Supply Catchment Areas
          2. Land Degradation
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          4. Heytesbury Soil and Land Management
          5. Salinity Mangagement
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Site SW60

Location: Simpson.Australian Soil Classification: Reticulate, Mesotrophic, Brown CHROMOSOL.
General Landscape Description: A plateau of dissected Tertiary sediments within a gently undulating plain.Site Description: Level to slightly sloping crest.
Geology: 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:

Image: GP60 Profile
Site 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 in size) 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 with conspicuous coarse (50-100 mm in size) reticulate mottling; very coarse to coarse (30-100 mm in size) polyhedral, parting to medium to fine (5-30 mm in size) polyhedral structure; smooth faced peds; pH 5.5.

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

Key Profile Characteristics:

pH
Salinity Rating
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
Image: GP61 Graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
CaCl2
EC
1:5
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)
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
0-25
<10
9.3
18
7
29
46
12
8
A2
25-40
<10
4.3
16
9
27
41
8
24
B21
40-80
<10
8
33
24
15
18
6
58
B22
80-105
<10
6.8
32
21
25
16
4
52

Management Considerations:

Subsoil (B) Horizons
  • The low exchangeable calcium:magnesium ratio in the subsoil (0.4 in B21, 0.2 in B22) indicates that nutrient imbalances may occur e.g. calcium deficiency.
Profile Described By: Mark Imhof and Richard MacEwan, April 1999.
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