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EGS255

Location: Fernbank (Tom’s Creek flood plain)

Australian Soil Classification: Mesotrophic, Mottled-Subnatric,Brown SODOSOL

Map Unit: Fernbank
Previous Name: EG255

General Landscape Description: Meander plain
Site description: Level
Native Vegetation: Plains grassy woodland
Geology: Neogene alluvial sediments


Soil Profile Morphology:

Surface Soil
A110-30 cmGreyish brown (2.5Y5/2); loamy sand; massive; clear change to:


Soils and lanforms of the Bairnsdale Dargo region - a guide to the major agricultural soils of East Gippsland 2011 - Fernbank EG255 - profile
A1230-65 cmDark grey (10YR4/2); loamy coarse sand; massive, loose to very weak consistence moist; abundant (50-90%) rounded quartz pebbles (20-60 mm); clear change to:


A2165- 85/90 cmYellowish brown (10YR5/4); coarse sand; massive; sharp wavy change to:


2A2285/90-100/110 cmLight grey; sandy loam; massive; sharp tongued boundary to:
Subsoil


2B2100 /110 – 180 cmGreyish brown (2.5Y5/2) with common (10-20%) medium (5-15 mm) yellowish brown (10YR5/6) mottles; light medium clay; strong very coarse columnar structure, strongly parting to medium angular blocky; strong consistence dry; few (2-10%) large (20-60 mm) rounded quartz pebbles; diffuse change to:


2C180 – 270 cmBrown (10YR5/3) with few (2-10%) faint coarse (15-30 mm) yellowish brown mottles; coarse sandy clay loam; massive; abundant (50-90%) large (20-60 mm) rounded quartz pebbles

Key Profile Features:
  • Strong texture contrast between the sandy top soil and the medium heavy clay subsoil.
  • The surface 70 cm layer appears to have been deposited at a different period to the underlying layers.


Soil Profile Characteristics:

-

pH
Sodicity
Sub-surface
(A11 horizon)
Strongly acidic
Non sodic
None
(2A2 horizon)
Strongly acidic
Non sodic
None
Subsoil
110-180 cm
Moderately
acidic
Sodic
None

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
A11
0-30
0.7
<0.05
6.6
1.9
A12
30-65
5.1
4.4
<0.05
0.8
<0.05
14
2.1
0.5
0.3
<0.1
<0.1
31
62
3
3
7
2.8
A2
65-90
5.2
4.4
<0.05
0.3
<0.05
36
3
0.2
0.4
<0.1
<0.1
62
27
3
4
5.6
1.4
2A21
90-100
5.4
4.7
<0.05
7
1.1
<0.1
0.1
<0.1
<0.1
55
39
3
2
9.5
4
2A22
100-110
5.9
4.6
<0.05
6
1.5
<0.1
0.8
<0.1
<0.1
44
36
10
10
9.5
4
2B2
110-180
5.7
4.3
0.08
110
9
<0.1
5.0
0.1
1.1
26
22
4
46
30.2
18.4
2C
180-270
5.8
4.5
0.08
15
3.3
<0.01
2.7
0.1
0.8
55
23
4
17
13.5
7.1


Management Considerations

Whole profile
  • Plant available water is considered to be very low (estimated at 44 mm) for this profile based on an effective rooting depth of 65 mm.

Surface (A) horizons
  • The surface soil is strongly acid and it would be expected liming may improve plant growth.
  • Potassium is extremely deficient and a strong response to potassium fertiliser would be expected, provided phosphate was also added.
  • The surface horizons have an extremely low nutrient holding capacity. Organic matter is important for maintaining nutrient and water holding capacity, especially in sandy soils.
  • The low wilting points of the surface soils indicates plants will be able to use very light rains when the soil is dry. Due to the low water storage capacity of the surface soils, plants will soon suffer moisture stress unless follow-up rains occur.
Subsoil (B) horizons
  • The depth to the clay would have little influence on plant growth as it occurs too deep in the profile.

Profile Described By: Ian Sargeant, 2001.
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