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GP80

Location: Athlone Aust. Soil Class.: Bleached-Acidic, Eutrophic, Brown DERMOSOL
Geology: Cretaceous sandstone.


Image: GP80 and GP81 landscape
GP80 Landscape


Soil Profile Morphology:

Surface Soil

A10-8 cmVery dark brown (10YR 3/2); very fine sandy clay loam; moderate to strong (3 mm) polyhedral structure; firm consistence (dry); pH 4.8; abrupt change to:GP80 profile
GP80 Profile
A28-20 cmDark yellowish brown (10YR 4/4) conspicuously bleached (10YR 7/2 dry); fine sandy clay loam; weak (6 mm) blocky structure; very firm consistence (dry); pH 4.8; clear change to:
A2220-40 cmDark yellowish brown (10YR 4/4); conspicuously bleached (10YR 7/2 dry) colour; very fine sandy clay loam; weak very coarse blocky structure; very firm consistence (dry); pH 5.0; clear change to:
Subsoil
B145-60 cmYellowish brown (10YR 5/4) with yellowish brown (10YR 5/6) mottles (20%); clay loam; weak to moderate coarse blocky structure; firm consistence (dry); pH 5.1; clear change to:
B2160-75 cmYellowish brown (10YR 5/4) with strong brown (10YR 5/8) mottles; sandy clay; medium coarse blocky parting to weak medium blocky structure; pH 5.2; clear change to:
C75 cmMottled rock.

Key Profile Features:

  • Gradual increase in dry content with depth down the profile.
Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Very Strongly Acid
Very Low
Non-Sodic
None
Subsoil
(B21 horizon)
Strongly Acid
Very Low
Non-Sodic
None
Deeper Subsoil
(at 60-75 cm)
Strongly Acid
Very Low
Non-Sodic
None


GP80 graphs

Horizon
Horizon Depth
pH (water)
pH CaCl2
EC
1:5
NaCl
Exchangeable Cations
Ca
Mg
K
Na
Meq/100g
A1
0-8
4.8
4.2
0.13
6.0
3.0
0.49
0.26
A21
8-20
4.8
4.1
<0.05
3.2
2.5
0.25
0.14
A22
20-40
5.0
4.1
<0.05
1.7
2.7
0.25
0.17
B1
40-60
5.1
4.2
<0.05
1.8
4.5
0.26
0.29
B21
60-75
5.2
4.6
0.06
3.5
7.9
0.37
0.61

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
0-8
170
23
42.7
13.2
2.8
29.2
32.5
22.5
A21
8-20
390
19
36.2
21.9
0.8
34.1
36.0
24.5
A22
20-40
490
16
33.1
11.9
0.7
35.0
36.5
24.0
B1
40-60
410
15
32.2
11.5
0.4
33.2
35.5
28.5
B21
60-75
510
20
38.9
13.6
0.3
27.3
30.5
38.5

Management Considerations:

Whole Profile

  • High levels of exchangeable aluminium (increasing to very high levels in deeper subsoil) which will restrict the growth of aluminium sensitive species. High levels of aluminium will also test to "fix” phosphorus and make it less available to plants (and therefore reduce the effectiveness of applied phosphorus fertiliser). Raising the pH levels of the soil by liming will help reduce the level of exchangeable aluminium. A lime test (samples across the whole paddock) may be appropriate to determine the amount of lime needed to raise pH. Other factors need to be considered however before lime is recommended (e.g. species growth, method of application, long trial response, likely cost benefit).
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