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PVI5

Location: PVI Hamilton

Australian Soil Classification: Terric, Basic, Sapric ORGANOSOL
Northcote Factual Key: O
Great Soil Group: Possibly a prairie soil.

Geology: Alluvium overlying quaternary basalt.
General Landscape Description: Broad depression (drained swamp).
Soil Mapping Unit: Tabor loam (peaty phase).
Site Description: Grazing paddock.

Photo: Soil Site PVI 8 Profile
Site PVI5 Landscape


Soil Profile Morphology:

Surface Soil

A10-20 cmBlack (10YR2/1); loam; weak coarse blocky structure; very weak consistence (dry); pH 5.8; clear change to:
Photo: Soil Site PVI 5 Profile
Site PVI5 Profile
Subsoil

B2120-30 cmBlack (10YR2/1); fine sandy clay loam (organic); strong medium polyhedral, parting to strong fine to very fine polyhedral structure; very firm consistence (dry); pH 5.8; sharp change to:

P21

30-45 cmVery pale brown (10YR7/3); laminated sapric peat; sharp change to:
P2245-60 cmVery dark grey (10YR3/1); clayey peat; sharp change to:

D160-70 cmGrey (5Y5/1); medium clay; pH 7.0; clear change to:

D270-80 cmGrey (5Y6/1) with yellow (5Y7/6) mottles; sandy clay; sharp change to:

D380+ cmPale olive (5Y6/4); sandy clay loam; pH 8.0; rusty root channel mottling.
Key Profile Features:
    • Very high organic matter levels in upper soil profile.

Soil Profile Characteristics:

pH
Salinity Rating
Surface Soil
(A1 horizon)
Moderately Acid
Low
Non-Sodic
None
Upper Subsoil
(20 - 30 cm)
Moderately Acid
Low
Non-Sodic
None
Deeper Subsoil
(at 60-70 cm)
Moderately Alkaline
High
Non-Sodic
-
Graph: pH in PVI 5
Graph: Salinity in PVI 5
Graph: Clay in PVI 5
Horizon
Horizon
Depth
(cm)
pH
(water)
pH
(CaCl2)
EC 1:5
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-20
5.8
5.6
0.21
32
16
0.27
1.3
B21
20-30
5.8
5.7
0.25
39
22
0.72
1.7
P21
30-45
        PEAT LAYERS
P22
45-60
D1
60-70
7.0
6.0
0.20
9.8
12
0.43
1.2
D3
80+
8.0
7.6
0.81
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
0-20
23
30
73
53
39
9
12
18
B21
20-30
28
31
77
64
7
37
6
47
P21
30-45
        PEAT LAYERS
P22
45-60
D1
60-70
7
37
6
47
D3
80+
6
21
18
50


Photo: Site PVI5a Profile
Site PVI5a Profile

Paralithic, Basic, Sapric ORGANOSOL

Note: In some areas of the paddock the weathered basalt occurs within 50 cm of the soil surface.




Profile Described By: Mark Imhof, Paul Rampant (17/1/2001).
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