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EGS249

Location: Waygara

Australian Soil Classification: Bleached-Mottled, Magnesic, Yellow CHROMOSOL

Northcote Factual Key: Dy3.41
Great Soil Group: yellow podsolic
Mapping Unit: Waygara
AAP Mapping Unit: Silver Creek
Previous Site Name: EG249, CFTT04

General Landscape Description: Undulating plain.
Site description: 6% slope to south.
Land Use: Native forest
Native vegetation: Lowland forest.
Geology: Mid-Tertiary sediments regarded as colluvium.

Image: EG249 landscape
EG249 Landscape - typical of this unit 7 km south of the sample site.

Soil Profile Morphology:

Surface Soil

A10 – 15 cmDark grey (10YR4/1); fine sandy clay loam; weak medium granular structure; weak consistence moist; clear smooth transition to:
Image: EG249 profile
EG249 Profile

A215 – 52 cmVery pale brown (10YR7/4) conspicuous bleach; fine sandy clay loam; massive; very weak consistence moist; clear smooth transition to:
Subsoil

B152-60 cmBrownish yellow (10YR6/6) with common medium faint yellowish brown (10YR5/4) mottles; sandy clay; massive; weak consistence moist; clear wavy transition to:
B2160-90 cmLight yellowish brown (2.5Y6/4), many coarse distinct red (2.5YR4/6) mottles; light medium clay; moderate coarse polyhedral, parting to moderate medium polyhedral structure; very firm consistence moist; diffuse smooth transition to:
B2290-140 cmGrey (10YR6/1) with many very coarse prominent dark yellowish brown (10YR4/6) mottles; light medium clay; moderate coarse prismatic, parting to strong fine polyhedral structure; very firm consistence moist.


Key Profile Features:
  • Lack of strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
B21
60-90
5.9
5.1
0.05
<0.05
7.9
0.07
0.65
B22
90-140
5.7
4.8
0.07
<0.05
8.6
0.08
0.91

Horizon
Horizon Depth
(cm)
Exchangeable Aluminium
mg/kg

Exchangeable Acidity

meq/100g
Field Capacity
pF 2.5
Wilting Point
pF 4.2
Coarse Sand
(0.2-2.0 mm)
Fine Sand
(0.02-0.2 mm)
Silt
(0.002-0.02 mm)
Clay
(<0.002 mm)
B21
60-90
<10
8.6
32.4
19.1
20.7
16.3
11.5
50
B22
90-140
32
9.9
30.6
22.3
15.2
14.4
11
57


Management Considerations
  • The calcium and potassium levels in the subsoil are extremely low, but the levels nearer the surface are not known.
  • The subsoil has low calcium as well as a low calcium to magnesium ratio. Calcium deficiencies may occur as a result.

NOTE: This profile is paler than is typical for Silver Cree loam mapping unit. It better fits into Boolarra loam in terms of colour but Silver Creek as far as texture is concerned.

Profile Described by: Ian Sargeant and Justin Wong (June 1999).
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