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GP52

Location: Bass HillAust. Soil Class.: Basic, Lithic, Bleached-Orthic TENOSOL
General Landscape Description: Midslope of hill (18% slope) (north-north easterly aspect)
Geology: Cretaceous sediments.

GP52 Landscape
GP52 Landscape


Soil Profile Morphology:

Surface Soil

A10-20 cmVery dark greyish brown (10YR3/2); fine sandy clay loam; hardsetting surface condition; weak blocky, parting to moderate coarse blocky structure; very firm consistence dry; pH 5.9; clear change to:
GP52 profile
GP52 Profile
A220-40 cmYellowish brown (10YR5/4) bleached (10YR7/3d); fine sandy loam; massive to weak coarse blocky structure; firm consistence dry; pH 5.5; gradual change to:
Subsoil
B2140-65 cmLight yellowish brown (10YR6/4) with fine yellowish brown (10YR5/8) mottles; sandy loam; weakly structured; firm consistence dry; pH 5.8; smooth and wavy change to:
C65+ cmSandstone.

Key Profile Features:

  • Hardsetting surface condition.
  • The profile has a high fine sand content (>40%) throughout.
  • The subsurface (A2) horizon is bleached.
Soil Profile Characteristics:
pH
Salinity Rating
Surface
(A1 horizon)
Moderately Acid
Very Low
Non-Sodic
-
Subsoil
(B21 horizon)
Moderately Acid
Very Low
Non-Sodic
-
GP52 pH
The profile is moderately acid throughout.		GP52 salinity
The profile has a very low salinity
rating throughout.		GP52 exchangeable aluminium
The exchangeable aluminium levels within the surface are insignificant becoming low in the subsurface (A2) horizon.		GP52 clay
The clay content remains fairly constant
throughout the profile.
Horizon
Horizon Depth
pH (water)
pH CaCl2
EC
1:5
NaCl
Exchangeable Cations
Ca
Mg
K
Na
Meq/100g
A1
0-20
5.9
5.1
0.05
6.5
1.1
0.23
0.16
A2
20-40
5.5
4.7
<0.05
2.1
0.48
0.07
0.11
B21
40-65
5.8
4.9
<0.05
3.5
1.1
0.1
0.12

Horizon
Horizon Depth
Ex Al
mg/kg
Ex Ac
meq/100g
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
0-20
<10
10
9.3
9
42
27
16
A2
20-40
40
7.7
6.8
8
46
29
16
B21
40-65
23
5.1
6.7
10
54
25
13


Management Considerations:

Surface (A) Horizons

  • The surface soil is hardsetting and requires organic matter for maintaining soil aggregation. Currently, organic matter levels are moderate but this will decline if cropping takes place and can be improved by adopting practices such as residue retention, minimum tillage and utilising pasture rotations.
  • The inherent fertility of the surface (A1) horizon (based on the sum of the exchangeable calcium, magnesium and potassium cations) is low. The nitrogen levels are moderate.
Subsoil (B) Horizon
  • The subsoil has a relatively low inherent fertility throughout (based on the sum of the exchangeable basic cations).
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