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PVI 7

Site: PVI 7Land Unit: Monivae Basalt
Aust. Soil Class.: Melanic (& Ferric), Eutrophic, Brown CHROMOSOL (thick, moderately gravelly, clay loamy surface) (confidence level 1)

General 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: Near slope of low riseInternal drainage: Moderately well drained

Soil Profile Morphology

A10-20 cmVery dark greyish brown (10YR3/2), very fine sandy clay loam, moderate to strong medium polyhedral, parting to moderate to strong fine polyhedral structure, firm consistence (dry), many (30%) ferruginous nodules (2-5 mm), well structured uncultivated, pH 5.7. Clear change to:Soil pit PVI 7 profile
A2120-30 cmBrown (10YR5/3), sporadically bleached, clay loam (very fine sandy), moderate coarse blocky, parting to moderate medium blocky structure, firm consistence (dry), pH 6.2. Gradual change to:
A2230-40 cmBrown (10YR5/3) with few faint yellowish brown (10YR5/6) mottles, light clay (very fine sandy) , strong consistence (dry), pH 6.5. Clear change to:
Subsoil
B2140-55 cmBrown (10YR4/3) with few (10%) yellowish brown (10YR5/4) mottles, medium clay, moderate medium polyhedral, parting to moderate fine polyhedral structure, strong consistence (dry), few (5%) ferruginous nodules (2-10 mm), pH 6.5. Gradual change to:
B2255-100 cmBrown (10YR4/3) with many (20%) brownish yellow (10YR6/6) mottles, medium clay, moderate coarse prismatic, parting to moderate to strong coarse to medium to fine polyhedral structure, few (5%) ferruginous and manganese nodules (2-10 mm), pH 6.8. Gradual change to:
B23100+ cmLight brownish grey (2.5Y6/2) and brownish yellow (10YR6/6), medium clay, strong consistence (moist), pH 6.5.

Key Profile Features

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

pH
Salinity Rating
Sodicity
Dispersion
Surface soil
(A1 horizon)
Moderately Acid
Low
Non-Sodic
None
Upper subsoil
(40-55 cm)
Slightly Acid
Low
Non-Sodic
-1
Deeper subsoil
(at 10+ cm)
Slightly Acid
Low
Sodic
None
1 strong dispersion after remoulding

Soil pit PVI 7 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
5.7
5.0
0.09
6.1
3.6
0.29
0.40
<10
37.4
17.0
6.4
31.1
22.0
31.0
A21
20-30
6.2
5.3
0.06
5.3
3.5
0.12
0.44
<10
31.2
14.2
9.2
31.2
33.0
30.5
A22
30-40
6.5
5.5
0.06
5.2
4.1
0.09
0.58
33.0
17.2
13.5
24.6
17.5
41.0
B21
40-55
6.5
5.6
0.07
6.0
6.1
0.14
0.89
11
41.7
24.5
6.2
17.0
11.5
61.0
B22
55-100
6.8
6.0
0.11
5.7
8.4
0.20
1.5
11
49.9
30.6
3.5
7.2
11.5
76.5
B23
100+
6.5
6.0
0.23
4.3
10
0.20
3.1
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