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EGW119

Location: Orbost South

Australian Soil Classification: Melanic, Eutrophic, Black DERMOSOL

Map Unit: River flats (rf)
Previous Site Name: EG119

General Landscape Description: Alluvial plain
Site description: Level plain >1% slope
Land Use: Grazing
Native Vegetation: Riparian forest
Geology: Recent sediments

Soils and landforms of Far East Gippsland - River flats EG119 landscape

Soil Profile Morphology:

Surface soil

A11

0 – 30 cm

Very dark greyish brown (10YR3/2); clay loam, (high in organic matter); strong medium polyhedral structure; weak consistence moderately moist; pH 6.1; gradual change to:

A12

30 – 70cm

Dark greyish brown (10YR4/2) distinctly mottled with fine common dark brown (7.5YR3/4) mottles ; fine sandy clay loam; moderate medium polyhedral structure; weak consistence moist; pH 6.4; clear change to:

Subsoil

D

70 – 110cm

Very dark grey (10YR3/1); silty clay loam; weak to moderate coarse prismatic structure; firm consistence moderately moist; pH 5.5.


Key Profile Features:
  • Uniform textures throughout.


Soil Profile Characteristics:



-

pH
Salinity
Surface soil
(A11 horizon)
Slightly acid
Very low
Non sodic
None1
Subsoil
(A12 horizon)
Slightly acid
Very low
Non sodic
None2
Deep subsoil
(D horizon)
Strongly acid
Very low
Non sodic
None

1 Slight dispersion after remoulding. 2 Strong dispersion after remoulding.


Chemical and Physical Analysis:
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl
2)
EC
dS/m
Organic Carbon
%
Total
Nitrogen
%
Exchangeable Aluminium ppm
Exchangeable Acididty
meq/100g
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)
%
Field Capacity
% w/w
Wilting Point
% w/w
Ca
Mg
K
Na
meq/100g
A1
0-30
6.1
5.2
0.09
2.2
0.24
11
12.0
8.1
5.5
0.5
0.53
0
32
39
25
35.2
20.3
A12
30-70
6.4
5.5
0.08
11
9.2
8.5
5.9
0.21
0.56
0
44
26
22
30.7
14.1
D
70-110
5.5
4.7
0.13
42
16.0
4.6
4.0
0.22
0.62
1
40
26
25

Management Considerations

Whole profile
Surface soil (A horizons)
  • The deep surface soil is well structured
  • Infiltration of water into the well structured surface soil would be quite high. This horizon is also very well drained
  • The nutrient holding capacity of the soil is high (based on the sum of the exchangeable cations)
  • Potassium levels are moderate to high and any response to potassium fertilizer is unlikely
  • The soil is slightly acid and unlikely to respond to lime.

Profile Described By: David Rees and Grant Boyle, 2000.
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