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PVI 6

Site: PVI 6Land Unit: Monivae Basalt
Aust. Soil Class.: Ferric-Sodic, Mesotrophic, Brown CHROMOSOL (thick, clay loamy surface - moderate profile depth) (confidence level 1)

Soil pit PVI 6 landscapeGeneral Land Unit Description:
The level to gently undulating basalt plains between Branxholm and Glenthompson consist of an association of Vertic or Ferric Brown Chromosols and Ferric Brown Sodosols. The Chromosols typically occur on the upper slopes and crests of very slight rises that may have scattered surface boulders, and Sodosols on the lower slopes and depressions. Sodosols or Vertosols, occasionally with a sporadic bleached subsurface horizon, are usually found in open depressions or drainage lines.

Site Description:
Geology: Quaternary basaltLandform pattern: Level to gently undulating plain
Position in landscape: Low lying area below riseInternal drainage: Moderately well drained

Soil Profile Morphology

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:Soil pit PVI 6 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

Soil Profile Characteristics

pH
Salinity Rating
Sodicity
Dispersion
Surface soil
(A1 horizon)
Strongly Acid
Low
Non-Sodic
None
Upper subsoil
(35-50 cm)
Moderately Acid
Low
Non-Sodic
None
Deeper subsoil
(at 70-90 cm)
Slightly Acid
Low
Sodic
None

Soil pit PVI 6 graphs

Horizon
Horizon
Depth
pH
(water)
pH
CaCl2
EC
dS/m
NaCl
%
Exchangeable Cations
Ex Al
mg/kg
Ex Ac
meq/100g
Field
pF2.5
Wilting
Point
pF4.2
Coarse
Sand
(0.02-0.2mm)
Fine Sand
(0.02-0.2mm)
Silt
(0.02-0.02mm)
Clay
(<0.002mm)
Ca
Mg
K
Na
meq/100g
A1
0-20
5.3
4.6
0.07
4.3
1.47
0.11
0.18
16
39.1
20.4
11.1
33.7
25.0
22.5
A2
20-35
5.8
5.0
0.07
2.9
2.4
0.11
0.31
<16
26.9
11.6
21.9
25.1
20.0
27.5
B21
35-50
5.6
4.6
0.07
3.0
6.1
0.15
0.87
32
11
41.0
26.3
2.0
14.2
11.0
68.5
B22
50-70
5.8
4.8
0.10
2.7
7.9
0.15
1.5
21
15
46.6
31.3
1.0
5.4
7.5
83.0
B23
70-90
6.2
5.5
0.12
3.0
8.9
0.17
2.2
<10
49.9
30.7
2
6.1
9.5
80
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