SW61

Location: Simpson.

Australian Soil Classification: Melacic, Humic/Humosesquic, Semiaquic PODOSOL
Great Soil Group: podzol

General Landscape Description: Plateau of dissected Tertiary sediments within a gently undulating plain.
Site Description: Level to slightly sloping plain.
Geology: Hanson Plain Sand
Land Use: Dairy cattle grazing.

SW61 Landscape.

Soil Profile Morphology:

Surface Soil

A1	0-45 cm	Black (7.5YR2.5/1); loamy fine sand; apedal; pH 4.2; clear and smooth change to:	SW61 Profile.
A2	45-65/75 cm	Grey (10YR5/1 moist); light grey (10YR7/1 dry); loamy medium sand; apedal; pH 4.4; abrupt and irregular change to:
Subsoil
B21h	65/75-90 cm	Black (7.5YR2.5/1); sandy loam; apedal; pH 4.2; clear and wavy change to:
B22hs	90-100/110 cm	Very dark brown (10YR2/2); cemented sand 'coffee rock'; apedal; pH 4.5; abrupt and wavy change to:
B23s	100/110 cm+	Yellow (2.5Y7/6) with yellowish brown (10YR5/8) and dark red (2.5YR4/8) mottles ; cemented sand; apedal; pH 4.8.

Key Profile Features:

Soil Profile Characteristics:

The surface is extremely acid. The subsoil is extremely acid becoming less acid at depth.

Salinity rating is low throughout the profile.

The coarse sand is high throughout the profile.

Clay content is low throughout the profile.

Exchangeable Aluminium increases to very high levels in the subsoil.

Horizon	Horizon Depth (cm)	Oxidisable Organic Carbon %	Total Nitrogen %	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	0-10	5.1	0.14	42	18	34	43	15	3
A2	45-70	-		<10	1.5	34	48	19	<1
B21	70-90	2.6		270		30	45	17	6
B22	90-105	4.3				-	-	-	-
B23	105+	-				26	33	11	18

Profile Described By: Mark Imhof and Richard MacEwan (March 1999).

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