SFS13

Location: Mt Pollock.

Australian Soil Classification: Vertic, Mottled-Subnatric, Black SODOSOL

General Landscape Description: Possible alluvial fan below eruption point to east.
Site Description: Southern Farming System (SFS) raised bed site. Simple slope, approximately 300m upslope from SFS3.
Geology: Quaternary - Newer Volcanics.
Land Use: Canola in raised beds.

Surface Soil			SFS13 Profile
Ap	0-20 cm	Very dark greyish brown (10YR3/2); medium clay; granular surface condition; fine structure with a few strong coarse peds; loose friable to very firm consistence dry; very few buckshot; pH 6.1; sharp change to:
Subsoil
B21g	20-60 cm	Very dark grey (10YR3/1) with many dark yellowish brown (10YR4/6) mottles; medium heavy clay; coarse prismatic, parting to coarse blocky structure; rigid consistence dry; some fine roots in gleyed portion of peds; pH 6.3: NOTE: 20-40 cm depth an A2 can infrequently occur - very occasional pockets of grey (10YR5/1 dry) gravelly material.
B22	60-80+ cm	Very dark grey (5Y3/1); lenticular structure; slickensides evident; pH 8.2.

• Strong texture contrast between surface (A) horizon and subsoil (B21) horizon.
• Extremely tough subsoil to excavate with a back hoe.
• Open cracks (>3 mm width) occur within the whole subsoil to 90 cm depth.

The pH in the surface and upper subsoil is slightly acid. The pH in the deeper subsoil is moderately alkaline.

The salinity rating is low to medium in the surface. The subsoil is very low to low.

The surface is non sodic. The upper subsoil is marginally sodic becoming strongly sodic with depth.

The clay content increases sharply at the surface / subsurface interface.

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl2)	EC dS/m	Total Nitrogen %	Exchangeable Cations
						Ca	Mg	K	Na
						meq/100g
Ap	0-20	6.1	5.7	0.22	0.20	8.5	4.8	0.47	0.72
B21	20-60	6.3	5.3	0.12		6.7	9.9	0.81	1.6
B22	60-80	8.2	7.3	0.25		6.7	13	0.71	3.7

Horizon	Horizon Depth (cm)	Oxidisable Organic Carbon %	Exchangeable Aluminium mg/kg	Exchangeable Acidity meq/100g	Field Capacity pF2.5	Wilting Point pF4.2	Coarse Sand (0.2-2.0 mm)	Fine Sand (0.02-0.2 mm)	Silt (0.002-0.02 mm)	Clay (<0.002 mm)
Ap	0-20	2.4	<10	10	27.7	13.1	18	37	15	24
B21	20-60		<10	9.3	34.9	19.3	13	31	12	42
B22	60-80				37.8	20.2	12	31	11	43

• Plant available water capacity (PAWC) is considered to be medium (estimated at 103 mm) in the upper 100 cm of this soil profile.