SM01

Location: Buckley Swamp

Australian Soil Classification: Melacic-Mottled (& Vertic), Eutrophic, Brown CHROMOSOL

General Landscape Description: Undulating lava plain adjacent to Buckley Swamp.
Site Description: Mid slope.
Land Use: Grazing.
Geology: Basalt.

Image: SM01 Landscape
SM01 Landscape - pit in the foreground.

Soil Profile Morphology:

Surface Soil			SM01 profile
A11	0-13 cm	Very dark greyish brown (10YR3/2); firm surface condition; light clay loam (fine sandy); strong medium polyhedral, parting to very fine polyhedral structure; rough fabric; weak consistence moderately moist; many fine roots present; pH 5.1; clear change to:
A12	13-30 cm	Very dark greyish brown (10YR3/2); clay loam; moderate medium polyhedral, parting to very fine polyhedral structure; rough fabric; very weak consistence moist; contains very few ferro-manganiferous nodules; many fine roots present; pH 5.1; clear change to:
A2	30-55 cm	Brown (7.5YR4/3); clay loam; weak coarse polyhedral, parting to fine polyhedral structure; rough fabric; weak consistence moderately moist; gravelly ferro-manganiferous nodules abundant; fine roots common; pH 6.1; clear change to:
Subsoil
B21	55-80 cm	Yellowish brown (10YR5/4) with faint dark red (2.5YR4/8) mottles common; medium clay; moderate medium prismatic, parting to very fine polyhedral structure; smooth fabric; weak consistence moist; gravelly ferro-manganiferous nodules common; very fine roots common; pH 6.6; diffuse change to:
B22	80-130 cm	Dark yellowish brown (10YR4/6) with many coarse distinct dark yellowish brown (10YR4/4) and dark red (2.5YR4/8) mottles; medium clay; moderate coarse lenticular, parting to fine angular blocky structure; smooth fabric; weak consistence moist; faint slickensides common with few distinct organo-clay cutans evident; very few very fine roots present; pH 6.4; clear change to:
BC	130-150+ cm	Greyish brown (10YR5/2) with many very coarse prominent dark red (2.5YR4/6) and light grey (5Y7/1) mottles; medium heavy clay; moderate coarse lenticular, parting to moderate angular blocky structure; smooth fabric; firm consistence moist; many distinct slickensides evident; contains few very weathered basalt fragments; very few very fine roots present; pH 6.6.

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Strongly Acid	Very Low	Non Sodic	None
Subsoil (B21 horizon)	Slightly Acid	Very Low	Non Sodic	None
Deeper Subsoil (at 80-130+ cm)	Slightly Acid	Very Low	Sodic	None

The surface soil is strongly acid. The subsoil is slightly acid.

The salinity rating is very low throughout the profile.

The surface and the upper subsoil are non-sodic. The deeper subsoil is sodic.

The MIR predicted clay content increases markedly at the A / B boundary.

Chemical and Physical Analysis:

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC dS/m	Total Carbon g/100g	Exchangeable Aluminium mg/kg	Exchangeable Acidity meq/100g	Exchangeable Cations
								Ca	Mg	K	Na
								meq/100g
A11	0 – 13	5.1	4.3	0.09	4.2	64	15	3.4	1.3	0.22	0.26
A12	13 - 30	5.1	4.2	0.05				2.6	0.9	0.15	0.16
A2	30 -55	6.1	5.2	0.05				2.9	1.3	0.08	0.22
B21	55 - 80	6.6	5.7	0.10			11	4.6	5.9	0.14	0.98
B22	80 - 130	6.4	5.8	0.13				4.3	7.7	0.15	1.4
B23	130 - 150+	6.6	5.8	0.14			9.9	4.4	11	0.11	2.1

Horizon	Horizon Depth (cm)	Field Capacity pF2.5 (MIR Predicted)	Wilting Point pF4.2 (MIR Predicted)	Coarse Sand (0.2-2.0mm) (MIR Predicted)	Fine Sand (0.02-0.2mm) (MIR Predicted)	Silt (0.002-0.02mm) (MIR Predicted)	Clay (<0.002mm) (MIR Predicted)


A11	0 – 13	28.9	12.0	11	34	22	20
A12	13 - 30	25.6	12.4	9	31	24	23
A2	30 -55	23.8	12.4	11	32	19	25
B21	55 - 80	37.3	23.6	7	16	12	60
B22	80 - 130	48.6	33.8	3	6	11	87
B23	130 - 150+	50.5	36.2	3	6	14	87

Profile Described By: David Rees and Ivanah Oliver (September 2014).

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