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PVI 5

Site: PVI 5Land Unit: Buckley Swamp Peats
Aust. Soil Class.: Terric, Basic, Sapric ORGANOSOL (confidence level 1)

Soil pit PVI 5 landscapeGeneral Land Unit Description:
Buckley Swamp consists of a valley infilled by an earlier lava flow, with the subsequent blockage of the drainage line resulting in peat accumulation. The area has been drained and burnt at various times in the past, resulting in some decomposition and loss of peat. The dominant soils of the plain are Organosols with massive or well-structured surfaces. The soils of the backplain are commonly Hydrosols with well structured surfaces and peaty horizons. There are also minor occurrences of Vertosols.

Site Description:
Geology: Quaternary basalt overlain by alluvialsLandform pattern: Flood plain
Position in landscape: Drainage depressionInternal drainage: Imperfectly drained

Soil Profile Morphology

A10-20 cmBlack (10YR2/1), loam, weak coarse blocky structure, very weak consistence (dry), pH 5.8. Clear change to:Soil pit PVI 5 profile
Subsoil
B2120-30 cmBlack (10YR2/1), fine sandy clay loam (organic), strong medium polyhedral, parting to strong fine to very fine polyhedral structure, very firm consistence (dry), pH 5.8. Sharp change to:
P2130-45 cmVery pale brown (10YR7/3), laminated sapric peat. Sharp change to:
P2245-60 cmVery dark grey (10YR3/1), clayey peat. Sharp change to:
D160-70 cmGrey (5Y5/1), medium clay, pH 7.0. Clear change to:
D270-80 cmGrey (5Y6/1) with yellow (5Y7/6) mottles, sandy clay. Sharp change to:
D380+ cmPale olive (5Y6/4), sandy clay loam, pH 8.0, rusty root channel mottling.

Key Profile Features

Soil Profile Characteristics

pH
Salinity Rating
Sodicity
Dispersion
Surface soil
(A1 horizon)
Moderately Acid
Low
Non-Sodic
None
Upper subsoil
(20-30 cm)
Moderately Acid
Low
Non-Sodic
None
Deeper subsoil
(at 60-70 cm)
Moderately Alkaline
HIgh
Non-Sodic
-

Soil pit PVI 5 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)
Total Carbon
(% w/w)
Ca
Mg
K
Na
meq/100g
A1
0-20
5.8
5.6
0.21
32
16
0.27
1.3
23
30
72.6
52.6
39.3
8.7
12
18
23
B21
20-30
5.8
5.7
0.25
39
22
0.72
1.7
28
31
76.7
63.7
7.4
36.8
6
46.5
28
P21
30-45
Peat Layers
P22
45-60
D1
60-70
7.0
6.0
0.20
9.8
12
0.43
1.2
7.4
36.8
6
46.5
D3
80+
8.0
7.6
0.81
.1
21
17.5
50
Soil pit PVI 5 profile1Site PVI 5a - Paralithic, Basic, Sapric ORGANOSOL
Note: In some areas of the paddock the weathered
basalt occurs within 50 cm of the soil surface.
CC BY 4.0 AU

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