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GP82

Location: LabertoucheAust. Soil Class.: Magnesic, Mottled-Hypernatric, Grey SODOSOL
General Landscape Description: Level plain (Tynong unit of Westernport survey)Geology: Quaternary alluvium (late Pleistocene)

Soil Profile Morphology:

Surface Soil

A10-15 cmBlack (10YR 2/1), light sandy clay loam (organic); weak coarse blocky structure, moist consistence (weak); organic mat at 4 cm; pH 4.8; abrupt and way change to:GP82 profile
GP82 Profile
A2115-35 cmBrown (10YR 5/3); sandy loam; weak to firm consistence (moist); pH 4.9; gradual change to:
A22 & Bhs35-60 cmLight grey (10YR 7/2) with few yellow (10YR 7/6) 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 (10YR 7/2) and light brownish grey (10YR 6/2) with yellow (10YR 7/8) and reddish yellow (7.5YR 6/8) mottles; medium clay with grit; moderate coarse blocky structure; very firm consistence (moist); quartz fragments (20%) with some feldspar; pH 7.7; gradual change to:
B2280-120 cmight brownish grey (10YR 6/2) with reddish yellow (7.5YR 6/8) mottles; light medium clay with grit; moderate very coarse blocky parting to moderate coarse blocky structure, felspar (10%) 2-5 mm fragments; pH 7.8:
B23120+ cmLight brownish grey (10YR 6/2); 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


GP82 graphs

Horizon
Horizon Depth
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
Ex Al
mg/kg
Ex Ac
meq/100g
Field
pF 2.5
Wilting Point
pF4.2
g/100g
Coarse Sand
(0.2-2.0mm)
%
Fine Sand
(0.02-0.2mm)
%
Silt
(0.002-0.02mm)
%
Clay
(<0.002mm)
%
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

  • Very low exchangeable calcium:magnesium ratio (i.e. <0.2). This may result in nutrient imbalances (e.g. calcium deficiency).
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