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PVI6

Location: PVI Hamilton.

Australian Soil Classification: Ferric-Sodic, Mesotrophic, Brown CHROMOSOL (thick, clay loamy surface - moderate profile depth).
Northcote Factual Key: Db 2.41
Great Soil Group: Possibly brown podzolic.

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

Site Description: Grazing paddock.

Photo: Soil Pit PVI 6 Landscape
PVI6 Landscape


Soil Profile Morphology:

Surface Soil

A10-20 cmVery dark greyish brown (10YR3/2); fine sandy clay loam; weak coarse blocky; weak consistence (dry); rusty root channel mottles; pH 5.3; clear change to:

Photo: Soil Site PVI 6 Profile
PVI6 Profile
A220-35 cmBrown (10YR5/3); clay loam (fine sandy); firm consistence (dry); very many (60%) ferruginous nodules (2-12 mm); few (10%) basalt fragments (5-12 mm); pH 5.8; abrupt change to:

Subsoil

B2135-50 cmBrown (10YR4/3) with few (5%) faint dark yellowish brown (10YR4/6) mottles; light medium clay; strong coarse blocky, parting to strong medium to fine polyhedral structure; strong consistence (dry); pH 5.6; clear change to:

B2250-70 cmDark greyish brown (10YR4/2) with yellowish brown (10YR5/6) and strong brown (7.5YR4/8) mottles; medium heavy clay; strong coarse blocky, parting to strong medium to fine polyhedral structure; very firm consistence (dry); pH 5.8; gradual change to:

B2370-90 cmDark grey (10YR4/1) with yellowish brown (10YR5/8) and strong brown (7.5YR5/6) mottles; medium heavy clay; strong coarse to medium blocky structure; strong consistence (dry); pH 6.2; gradual change to:

C90+ cmWeathered basalt.

Key Profile Features:
  • Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
  • A large amount of ferruginous nodules in the subsurface (A2) horizon.
Soil Profile Characteristics:


pH
Salinity Rating
Surface Soil
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None
Upper Subsoil
(35 - 50 cm)
Moderately Acid
Low
Non-Sodic
None
Deep Subsoil
(at 70 - 90 cm)
Slightly Acid
Low
Sodic
None

Graph: ph in PVI 6
Graph: Salinity in PVI 6
Graph: Sodicity in PVI 6
Graph: Clay in PVI 6
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC 1:5
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-20
5.3
4.6
0.07
4.3
1.47
0.11
0.18
A2
20-35
5.8
5.0
0.07
2.9
2.4
0.11
0.31
B21
35-50
5.6
4.6
0.07
3.0
6.1
0.15
0.87
B22
50-70
5.8
4.8
0.10
2.7
7.9
0.15
1.5
B23
70-90
6.2
5.5
0.12
3.0
8.9
0.17
2.2


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
16
39
20
11
34
25
23
A2
20-35
<10
27
12
22
25
20
28
B21
35-50
32
11
41
26
2
14
11
69
B22
50-70
21
15
47
31
1
5
8
83
B23
70-90
<10
50
31
2
6
10
80

Profile Described By: Mark Imhof, Paul Rampant (January 2001).
CC BY 4.0 AU

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