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LP104

Australian Soil Classification: Bleached-mottled, Subplastic, Brown CHROMOSOL

Northocte Factual Key: Dy 3.43
Great Soil Group: Soloth

Site Description: Alluvial terrace. Original vegetation includes Yellow box (Eucalyptus melliodora) and Red Stringybark (E. macrorhyncha).
Geology: Sandstone/Siltstone


LP104 Landscape image



Soil Profile Morphology

Surface Soil

A1 0-7 cmDark yellowish brown (10YR3/4) fine sand; massive structure; weak consistence dry; pH 5.7; clear change to:
LP104 profile photo

LP103 Profile
A217-50 cmLight yellowish brown (10YR6/4), conspicuously bleached very pale brown (10YR8/3d); fine sand; massive; weak consistence dry; pH 5.9; clear change to:
A2250-55 cmYellow (10YR7/6), conspicuously bleached white (10YR8/2d); fine sandy clay loam; massive; strong consistence dry; pH 5.5; abrupt change to:
Subsoil
B2155-70 cmYellowish brown (10YR5/4), with strong brown (7.5YR5/8) mottle; medium clay; subplastic; weak medium blocky structure breaking down to moderate fine polyhedral structure; strong consistence dry; pH 6.0; clear change to:
B2270-85 cmYellowish red (5YR5/6), with strong brown (7.5Y5/8) and yellowish brown (10YR5/4) mottles; light medium clay; moderate fine blocky structure; strong consistence dry; pH 6.6; clear change to:
B2385-110 cmYellowish red (5YR5/6), with many brownish yellow (10YR6/6) mottles; light medium clay; weak medium blocky structure; strong consistence dry; pH 6.6.

Key Profile Features
  • Strong texture contrast between surface (A) and the top subsoil (B21) horizon.
  • Conspicuously bleached subsurface (A2) horizon


Key Profile Characteristics

pH
Salinity Rating
Surface
(A1 horizon)
Moderately Acid
Very Low
Non-Sodic
Subsoil
(B21 horizon)
Moderately Acid
Very Low
Non-Sodic
Deeper subsoil
(70 cm)
Slightly Acid
Very Low
Non-Sodic


LP104 graphs
The A horizon is moderately acid. The B horizon is slightly acid.The salinity rating is very low.
This profile is non-sodic.Low clay content in the surface, with a sharp increase at the A/B interface.





Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Exch. Al
ppm
Organic Carbon
%
Exchangeable Cations
Coarse Sand
(0.2-2.0 mm)
%
Fine Sand
(0.02-0.2 mm)
%
Silt
(0.002-0.02 mm)
%
Clay
(<0.002 mm)
%
Wilting Point
% w/w
Ca
Mg
K
Na
meq/100g
A1
0-7
5.7
4.4
<0.05
1.2
1.1
0.38
0.54
0.06
2.8
A2
7-50
5.9
4.6
<0.05
0.32
0.22
0.18
0.05
1
84
10
3
1.1
A3
50-55
5.5
4.7
0.06
10
1.2
1.6
0.35
0.18
1
67
14
21
5.1
B21
55-70
6.0
5.3
0.11
3.7
4.8
1.0
0.44
2
38
8
57
15.7
B22
70-85
6.6
5.8
0.10
4.1
4.9
0.94
0.49
B23
85-110
6.6
5.8
0.06
2.7
3.6
0.52
0.32

Management Considerations:
    Surface (A) Horizons
    • The bleached subsurface (A2) horizons indicates that periodic waterlogging occurs on top of the more slowly permeable subsoil. This horizon is likely to become 'spewy' as a result.
    • The surface horizons have a low to very low inherent fertility (based on the sum of the basic exchangeable cations).
    • Organic carbon levels show that organic matter content is low for the surface soil from this pit. Organic matter is important for enhancing soil aggregation, fertility and water holding capacity. Organic matter levels will build up under pasture but will decline if cultivation takes place.
    • Low wilting point value (2.8% dropping to 1.1% below 7 cm). This infers that most water held in the soil will be available for plant uptake. It will probably be quite good in ‘dry’ years as any light rain will be available to the plants. It is not likely to hold much water and therefore probably won’t perform well in years when there is just an occasional good rain.
    Subsoil (B) Horizons
    • The subsoil is non-sodic and moderately well-structured so root and water movement should not be impeded, however water movement may be slow due to the increase in clay at the interface of the surface soil and the subsoil.

    Profile Described By: Mark Imhof, Paul Rampant and Karen DePlater, November 1995
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