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PVI4

Location: PVI Hamilton.

Australian Soil Classification: Endocalcareous, Epipedal, Grey VERTOSOL (non-gravelly surface).
Northcote Factual Key: Ug 5.24
Great Soil Group: Grey Clay

Geology: Alluvium overlying Tertiary/Quaternary basalt.
General Landscape Description: Lower lying areas below rise.
Soil Mapping Unit: Buckley Clay.
Site Description: Grazing paddock.

Photo: Soil Pit PVI 4 Landscape
PVI4 Landscape


Soil Profile Morphology:

Surface Soil

A10-15 cmDark grey (10YR4/1); light medium clay; moderate coarse blocky structure; very strong consistence (dry); pH 5.7; rusty root channel mottling; surface cracks:

Photo: Soil Pit PVI 4 Profile
PVI4 Profile
Subsoil

B2115-80 cmDark grey (10YR4/1); heavy clay; weak to moderate very coarse prismatic, parting to moderate coarse lenticular structure; very strong consistence (moist); pH 7.4:

B22

80-110 cmGreyish brown (2.5Y5/2) with olive yellow (2.5Y6/6) mottles; heavy clay; lenticular structure; very firm consistence (moist); very few (2%) soft fine carbonate nodules ; pH 8.8:

B23110+ cmGreyish brown (2.5Y5/2); heavy clay; lenticular structure; very firm consistence (moist); pH 8.6.

Key Profile Features:
  • Clay texture throughout the soil profile.
  • Surface cracking is evident in drier seasons.
  • Prominent vertic features in the subsoil i.e. lenticular peds.
Soil Profile Characteristics:


pH
Salinity Rating
Surface Soil
(A1 horizon)
Moderately Acid
Low
Non-Sodic
None1
Upper Subsoil
(15 - 80 cm)
Slightly Alkaline
Low
Sodic
Strong
Deeper Subsoil
(at 110+ cm)
Strongly Alkaline
Medium-High
Sodic
Strong
1 Strong dispersion after remoulding.

Graph: pH in PVI 4
Photo: Salinity in PVI 4
Photo: Sodicity in PVI 4
Graph: Clay in PVI 4

Horizon
Horizon
Depth
(cm)
pH
(water)
pH
(CaCl2)
EC 1:5
NaCI
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-15
5.7
4.2
0.06

6.9
6.3
0.25
0.71
B21
15-80
7.4
5.8
0.06

9.6
12
0.34
2.1
B22
80-110
8.8
7.7
0.27
0.03
9.0
14
0.3
4.0
B23
110+
8.6
8.1
0.84
0.13


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
0-15
18
16
44
24
2
31
24
37
B21
15-80
42
21
1
30
20
46
B22
80-110
45
23
1
28
25
46
B23
110+

Profile Described By: Mark Imhof, Paul Rampant (January 2001).
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