SW82

Excavation at site of SW82 and SW83		Site Code	SW82	Vertic (& Sodic), Calcic Black CHROMOSOL
		Location	East of Colac, between Warncoort-Birregurra road and railway line
		Landform	Gently undulating plain
		Geology	Quaternary basalt
		Element	Flat
		Slope	0
		Aspect	0
Horizon	Depth (cm)	Description
A1	0-10	Very dark brown (10YR2/2 moist and 10YR4/2 dry); pH 5.5; loam; clear boundary to:
B21	10-40	Black (10YR3/2 moist); medium heavy clay; medium to fine (5-20 mm) polyhedral structure; strong consistence; pH 5.8; gradual boundary to:
B22	40-90	Black (10YR2/1 moist); heavy clay; some pockets of fine buckshot; coarse prismatic, parting to fine lenticular structure; strong consistence; pH 6.8; abrupt boundary to:
B23ssgk	90 +	Dark greyish brown (10YR4/2 moist) with brownish yellow (10YR6/6 moist) and minor (<2%), light olive brown (2.5Y5/4 moist) mottles; soft carbonate and strongly vertic; medium (20-50 mm) prismatic structure; strong consistence; pH 8.5.
Management considerations
The soil is a ‘puff’ in a variable Gilgai complex comprising Sodosols (SW83), Chromosols and Vertosols (SW84). Waterlogging and shrink-swell activity of the clays are the principle hazards in this landscape.

Analytical data

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