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GP82

Location: Labertouche.Australian Soil Classification: Magnesic, Mottled-Hypernatric, Grey SODOSOL.
Geology: Quaternary alluvium (late Pleistocene).General Landscape Description: Level plain (Tynong mapping unit).
Site Description: Grazing paddock.


Soil Profile Morphology:

Surface Soil

A10-15 cmBlack (10YR2/1), light sandy clay loam (organic); weak coarse blocky structure, moist consistence (weak); organic mat to 4 cm; pH 4.8; abrupt and wavy change to:

Photo: Site GP82 Soil Profile
Site GP82 Profile
A2115-35 cmBrown (10YR5/3); sandy loam; weak to firm consistence (moist); pH 4.9; gradual change to:

A22 & Bhs

35-60 cmLight grey (10YR7/2) with few yellow (10YR7/6) mottles; light sandy clay loam; weak to firm consistence (moist); pH 7.0; discontinuous "coffee rock" layer; wavy and clear change to:

Subsoil

B2160-80 cmLight grey (10YR7/2) and light brownish grey (10YR6/2) with yellow (10YR7/8) and reddish yellow (7.5YR6/8) mottles; medium clay with grit; moderate coarse blocky structure; very firm consistence (moist); quartz fragments common (20%) with some feldspar; pH 7.7; gradual change to:

B2280-120 cmLight brownish grey (10YR6/2) with reddish yellow (7.5YR6/8) mottles; light medium clay with grit; moderate very coarse blocky, parting to moderate coarse blocky structure; feldspar (10%) 2-5 mm fragments; pH 7.8:

B23120+ cmLight brownish grey (10YR6/2); light medium clay with grit; pH 7.5.

Key Profile Features:

Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Very strongly acid
Medium
Non-sodic
None
Subsoil
(B21 horizon)
Slightly alkaline
Medium - High
Strongly Sodic
None1
Deeper Subsoil
(at 1.2 m)
Slightly alkaline
Medium - High
Strongly Sodic
None1
1Complete dispersion after remoulding


Graph: Site GP82 pH levels
Graph: Site GP82 Salinity levels
Graph: Site GP82 Sodicity levels
Graph: Site GP82 Clay%

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC 1:5
NaCl
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-15
4.8
4.1
0.35
0.07
4.0
1.1
0.2
0.5
A21
15-35
4.9
4.5
0.31
0.07
0.6
0.2
<0.1
<0.1
A22
35-60
7.0
6.4
0.33
0.07
0.5
0.9
<0.1
0.2
B21
60-80
7.7
7.1
0.51
0.12
0.8
3.7
0.3
2.2
B22
80-120
7.8
7.1
0.48
0.11
0.6
4.4
0.2
2.5
B23
120+
7.5
6.9
0.41
0.10
0.4
3.3
0.2
1.9

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
0-15
39
17
31.7
10.3
31.9
29.2
19.0
8.0
A21
15-35
12
2.0
15.4
2.3
37.8
32.5
21.5
6.0
A22
35-60
13.5
1.0
33.6
34.5
21.0
10.0
B21
60-80
21.4
10.3
30.4
23.0
17.0
28.0
B22
80-120
25.8
19.5
29.0
20.4
16.5
32.0
B23
120+
28.3
23.2
18.0
28.0



Management Considerations:

Subsoil (B) Horizons Profile Described By: Mark Imhof, Austin Brown
CC BY 4.0 AU

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