SW110

Location: Mt Gellibrand.

Australian Soil Classification: Vertic (& Calcic), Mottled-Mesonatric, Grey SODOSOL (very deep soil profile).

General Landscape Description: Lower part of a slope on the western side of Mt Gellibrand.
Site Description: Grazed area adjacent to cropping area, low slope angle, westerly aspect.
Geology: Almost entirely quartz sand, of uncertain origin - possibly a Tertiary quartz-rich marine sediment. Soil in the pit has also been subject to soil creep and wash from weathering scoria slopes above.

SW110 Landscape

A1	0-5 cm	Very dark greyish brown (10YR3/2); sandy clay loam; moderate fine-very fine polyhedral structure; weak to firm consistence dry; abundant roots throughout; pH 5.9:	SW110 Profile
A2	5-12 cm	Brown (7.5YR4/3); rusty root channel mottling; sandy clay loam; weak medium blocky structure; some capping on the columnar structure below; firm to very firm consistence dry; abundant roots throughout; pH 7.3; abrupt change to:
Subsoil
B21	12-30 cm	Dark greyish brown (10YR4/2) with many brown (7.5YR4/4) and dark yellowish brown (10YR4/4) mottles; dark colour along ped faces; heavy clay; moderate to strong very coarse prismatic, parting to strong coarse blocky structure; some columnar structure in patches; very strong consistence dry; pH 6.8:
B22	30-45/55 cm	Very dark greyish brown (10YR3/2); heavy clay; strong very coarse prismatic, parting to strong coarse blocky structure; few soft manganese segregations and stains; very few medium (10 mm in size) ferromanganiferous nodules; slickensides present; very strong consistence dry; abrupt and wavy change to; pH 8.4:
B23k	45/55-90 cm	Dark greyish brown (2.5Y4/2); light medium clay; strong coarse blocky, parting to medium blocky structure; fine-earth carbonates common; slickensides present; pH 9.6:
2A1	90-110 cm	Brown (7.5YR5/4) and dark grey (10YR4/1); sandy loam; moderate medium blocky, parting to fine blocky structure; few coarse (10 mm in size) ferromanganiferous nodules; sand common along cracks; pH 9.7:
2B1	110-130/140 cm	Brown (7.5YR5/4) with yellowish red (5YR4/6) and yellowish brown (10YR5/6) mottles; sandy clay loam (contains well structured light yellowish brown (2.5Y6/3) clay aggregates mixed with sand); strong medium lenticular parting to fine lenticular structure; pH 9.4:
2B2	130/140-180 cm	Light yellowish brown (2.5Y6/3) with brownish yellow (10YR6/6) mottles; light medium clay; strong medium to fine lenticular structure; weak to firm consistence moist; few fine-earth carbonates; some red (10R5/6) soft ochre-like clayey pebbles present in patches; pH 9.4.

• Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
• Vertic features (slickensides, lenticular peds) in subsoil.
• Dense and coarsely structured subsoil (columnar in some areas).
  

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Moderately Acid	Low	Sodic	None
Subsoil (B21 horizon)	Slightly Acid	Low	Sodic	Strong1
Deeper subsoil (at 80-110 cm)	Very Strongly Alkaline	High	Strongly Sodic	Slight2

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl2)	EC dS/m	NaCl %	Total Nitrogen %	Organic Carbon %	Exchangeable Cations
								Ca	Mg	K	Na
								meq/100g
A1	0-5	5.9	5.1	0.12		0.45	6	5.6	4.2	0.61	0.91
A2	5-12	7.3	6.8	0.27	0.01			2.1	3.5	0.4	1.8
B21	12-30	6.8	5.7	0.18				5.2	12	1.5	4.3
B22	30-55	8.4	7.4	0.29	0.02			5.4	15	1.3	6.1
B23k	55-80	9.6	8.7	0.77	0.08			6	19	0.9	11
2A1	80-110	9.7	8.9	0.66	0.08			-	-	-	-
2B1	110-140	9.4	8.7	1	0.16			-	-	-	-
2B2	140-180	9.4	8.7	1	0.18			3.9	14	0.8	8.6

Horizon	Horizon Depth (cm)	Extractable Aluminium %	Extractable Iron %	Exchangeable Aluminium mg/kg	Exchangeable Acidity meq/100g	Coarse Sand (0.2-2.0 mm)	Fine Sand (0.02-0.2 mm)	Silt (0.002-0.02 mm)	Clay (<0.002 mm)
A1	0-5			<10	12	42	24	9	16
A2	5-12				4.6	47	28	9	14
B21	12-30	0.25	1.9		11	26	19	6	45
B22	30-55	0.16	1.4			34	22	8	34
B23k	55-80					28	18	8	41
2A1	80-110					-	-	-	-
2B1	110-140					40	12	4	37
2B2	140-180					42	14	5	35