Victorian Resources Online (archived)

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.

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

Soil Profile Morphology:

Surface Soil

A1	0 – 15 cm	Dark grey (10YR4/1); fine sandy clay loam; weak medium granular structure; weak consistence moist; clear smooth transition to:	EG249 Profile
A2	15 – 52 cm	Very pale brown (10YR7/4) conspicuous bleach; fine sandy clay loam; massive; very weak consistence moist; clear smooth transition to:
Subsoil
B1	52-60 cm	Brownish yellow (10YR6/6) with common medium faint yellowish brown (10YR5/4) mottles; sandy clay; massive; weak consistence moist; clear wavy transition to:
B21	60-90 cm	Light 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:
B22	90-140 cm	Grey (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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