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PVI8

Location: PVI Hamilton.

Australian Soil Classification: Melanic (&Ferric-Sodic), Eutrophic, Brown Chromosol (thick, moderately gravelly, clay loamy surface).
Northcote Factual Key: Dy 3.22
Great Soil Group: Possibly brown podzolic.

Geology: Tertiary/Quaternary basalt..
General Landscape Description: Upper slope of a rise.
Soil Mapping Unit: Monivae gravelly loam (crest phase).

Site Description: Edge of an agro-forestry block.

Photo: Soil Pit PVI 8 Landscape
Site PVI8 Landscape


Soil Profile Morphology:


Surface Soil

A10-20 cmVery dark greyish brown (10YR3/2); fine sandy clay loam; moderate coarse blocky, parting to moderate medium blocky structure; firm consistence (dry); many (25%) ferruginous nodules (2 - 5 mm); pH 5.5; clear change to:

Photo: Soil Pit PVI 8 Profile
Site PVI8 Profile
A220-35 cmBrown (10YR4/3); light clay; firm consistence (dry); many (40%) ferruginous nodules (2-5 mm); common (20%) amount of weathered basalt fragments (8-30 mm); pH 6.0; clear change to:

Subsoil

B2135-50 cmYellowish brown (10YR5/4 and 10YR5/8); with strong brown (7.5YR5/6) mottles; medium clay; moderate to strong medium to fine polyhedral structure; strong consistence (dry); few (2-5%) iron nodules (2-5 mm); pH 6.6; gradual change to:

B2250-80 cmBrownish yellow (10YR6/6) with dark red (2.5YR3/6) mottles; light clay; moderate to strong medium to fine polyhedral structure; strong consistence (dry); very few (1%) ferruginous nodules (2 mm) and manganese stains; pH 6.7; gradual change to:

B2380-120 cmYellowish brown (10YR5/4) with strong brown (7.5YR5/6) light yellowish brown (10YR6/4) and dark red (2.5YR4/6) mottles; light clay; moderate to strong medium blocky structure; very firm consistence (dry); manganese stains; some weathered basalt; pH 6.7; gradual change to:

BC120+ cmLight grey (10YR7/1) with brownish yellow (10YR6/8) and dark red (2.5YR4/8) mottles; light clay; strong consistence (moist); some weathered ferruginous basalt; pH 6.7.

Key Profile Features:

  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
  • A large amount of ferruginous nodules in the surface (A1) horizon.
Soil Profile Characteristics:


pH
Salinity Rating
Surface Soil
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None
Upper Subsoil
(35 - 50 cm)
Slightly Acid
Low
Non-Sodic
None
Deep Subsoil
(80 - 120 cm)
Slightly Acid
Low
Sodic
None

Graph: pH in PVI 8
Graph: Salinity in PVI 8
Graph: Sodicity in PVI 8
Graph: Clay in PVI 8


Horizon
Horizon
Depth
(cm)
pH
(water)
pH
(CaCl2)
EC 1:5
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-20
5.5
4.8
0.10
6.4
2.2
0.33
0.36
A2
20-35
6.0
5.2
0.07
5.3
3.1
0.20
0.37
B21
35-50
6.6
6.0
0.07
4.5
6.4
0.15
0.53
B22
50-80
6.7
6.2
0.08
3.8
6.7
0.12
0.90
B23
80-120
6.7
6.2
0.09
3.3
7.0
0.11
1.4
BC
120+
6.7
6.3
0.14
2.1
6.3
0.07
1.8


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
13
11
36
16
13
30
18
31
A2
20-35
<10
12
26
16
30
19
13
35
B21
35-50
11
38
27
7
12
10
69
B22
50-80
42
27
10
12
11
66
B23
80-120
44
32
5
10
11
74
BC
120+







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