SW83

Gilgai features close to SW82 and SW83		Site Code	SW83	Vertic (& Calcic), Subnatric, Black SODOSOL
		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), dark greyish brown (10YR4/2 dry); loam; pH 5.5; clear change to:
A2	10-60	Dark greyish brown (10YR4/2 moist), conspicuously bleached; (10YR7/2 dry); sandy clay loam; apedal massive structure; few [2%], fine buckshot nodules [concentrated in pockets]; pH 6.6; abrupt and wavy change to:
B21	60-90	Black (10YR2/1 moist); heavy clay; few pockets of ferruginous fine gravel; coarse prismatic structure; pH 6.8; abrupt change to:
B22	90 +	Mottled dark greyish brown grey with (10YR6/1 moist) and minor (<2%), brownish yellow (10YR6/8 moist) and light olive brown (2.5Y5/4 moist) mottles, soft calcareous segregations; strongly vertic; medium clay; medium prismatic structure; pH 8.6.
Management considerations
The soil is a ‘hollow’ in a variable Gilgai complex comprising Sodosols, Chromosols (SW82) and Vertosols (SW84). Waterlogging and shrink-swell activity of the clays are the principle hazards in this landscape.

Analytical data

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