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PVI10

Location: PVI Hamilton

Australian Soil Classification: Humose (& Vertic), Chromosolic, Redoxic, HYDROSOL
Northcote Factual Key: Dd 4.1
Great Soil Group: Humic gley

Geology: Alluvium overlying Quaternary basalt.
General Landscape Description: Level plain.
Soil Mapping Unit: Tabor loam.

Site Description: Grazing paddock.

Photo: Soil Pit PVI 10 Landscape
PVI10 Landscape


Soil Profile Morphology:

Surface Soil

A110-15 cmBlack (10YR2/1); loam; weak consistence (dry); pH 5.7; abrupt change to:

Photo: Soil Pit PVI 10 Profile
PVI10 Profile
A1215-25 cmBlack (10YR2/1); clay loam (organic); weak consistence (dry); some laminated peat in patches; pH 5.8; clear change to:

Subsoil

B21
25-45 cmVery dark grey (2.5Y3/0); medium heavy clay; moderate very coarse prismatic, parting to strong coarse blocky structure; strong consistence (dry); pH 6.5; clear change to:

B2245-100 cmGrey (10YR5/1) with many (20%) strong brown (7.5YR5/6) mottles; medium clay; moderate coarse prismatic, parting to strong medium to very fine lenticular structure; slickensides present; very firm consistence (moist); pH 7.8; gradual change to:

B23100-150 cmGrey (10YR5/1) with few (10%) strong brown (7.5YR5/6) mottles; light medium clay; strong very fine lenticular structure; very firm consistence (moist); very few (<1%) ferruginous nodules (5-10 mm); pH 8.1; clear change to:
B3150+ cmGreyish brown (2.5Y5/2); light medium clay; weak consistence (moist); pH 8.2.

Key Profile Features:
  • High organic matter content in the surface (A) horizons.
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
  • Vertic properties in the deeper subsoil i.e. lenticular structure and slickensides.

Soil Profile Characteristics:


pH
Salinity Rating
Surface Soil
(A1 horizon)
Moderately Acid
Low-Medium
-
None
Upper Subsoil
(25- 45 cm)
Slightly Acid
Low
Non-Sodic
None
Deeper Subsoil
(100-150 cm)
Moderately Alkaline
High
Sodic
-

Image:  PVI10 Graphs

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
5.3
0.29
7.4
5.7
2
0.6
A12
15-25
5.8
5.2
0.22
23
15
1.8
0.95
B21
25-45
6.5
5.8
0.24
20
19
1.6
0.94
B22
45-100
7.8
7.2
0.31
<0.01
15
19
1.7
1.3
B23
100-150
8.1
7.9
1.2
0.05
12
22
1.8
3.6
B3
150+
8.2
8.0
1.5


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
16
27
68
36
22
12
20
22
A12
15-25
17
26
56
40
34
8
12
24
B21
25-45
15
67
41
1
3
11
78
B22
45-100
64
37
1
7
11
76
B23
100-150
66
37
1
5
10
79
B3
150+

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