SM04

Location: Gatum

Australian Soil Classification: Ferric-Sodic, Eutrophic, Brown CHROMOSOL

General Landscape Description: Undulating dissected peneplain.
Site Description: Rise crest.
Land Use: Grazing.
Geology: Neogene sediments.

Image: SM04 Landscape
SM04 Landscape

Soil Profile Morphology:

Surface Soil			SM04 Profile
A11	0-13 cm	Very dark grey (10YR3/1); firm surface condition; loam (fine sandy); moderate medium polyhedral, parting to fine polyhedral structure; rough fabric; medium roots abundant; pH 5.5; abrupt and wavy change to:
A12	13-27 cm	Dark greyish brown (10YR4/2), sporadically bleach; fine sandy loam; moderate medium polyhedral, parting to moderate fine polyhedral structure; rough fabric; weak consistence moderately moist; many gravelly ferruginous nodules; many medium roots present; pH 5.5; abrupt and wavy change to:
Subsoil
B21	27-45 cm	Light olive brown (2.5Y5/6) with faint strong brown (7.5YR4/6) mottles common; medium clay; moderate coarse polyhedral, parting to strong fine polyhedral structure; smooth to rough fabric; firm consistence moderately moist; contains few gravelly ferruginous nodules; few medium and fine roots present; pH 6.1; gradual change to:
B22	45-75 cm	Light olive brown (2.5Y5/6) with distinct dark greyish brown (10YR4/2) mottles common; medium clay; moderate coarse polyhedral, parting to moderate fine polyhedral structure; smooth fabric; firm consistence moderately moist; contains few gravelly ferruginous nodules; few fine and very fine roots present; pH 7.0; clear change to:
C1	75-110 cm	Light grey (2.5Y7/1) with many prominent yellowish red (5YR4/6) mottles; medium clay, fine sandy; massive; earthy fabric; firm consistence moderately moist; many gravelly ferruginous nodules; few very fine roots present; pH 5.3; gradual change to:
C2	110-150+ cm	Yellowish red (5YR4/6) with many prominent light grey (2.5Y7/1) mottles; light medium clay (fine sandy); massive; earthy fabric; firm consistence moderately moist; many gravelly ferruginous nodules; few very fine roots present; pH 6.3.

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Strongly Acid	Medium	Non-Sodic	None
Subsoil (B21 horizon)	Slightly Acid	Very Low	Non-Sodic	None
Deeper Subsoil (at 75-110+ cm)	Strongly Acid	Very Low	Sodic	None

The surface soil is strongly acid. The upper subsoil is slightly acid becoming strongly acid with depth.

The surface has a medium salinity rating. The salinity rating in the deeper subsoil is very low.

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

The MIR predicted clay levels are quite high in this profile.

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC dS/m	Exchangeable Acidity meq/100g	Total Carbon g/100g	Exchangeable Aluminium mg/kg	Exchangeable Cations
								Ca	Mg	K	Na
								meq/100g
A1	0-13	5.5	4.7	0.34	14	5.3	<10	4.1	1.6	1.7	0.1
A2	13-27	5.5	4.6	0.08	9			2.3	1.1	0.6	0.2
B21	27-45	6.1	5.5	0.15	10			5.1	4.0	1.1	0.5
B22	45-75	7.0	6.2	0.11				5.6	6.4	0.2	0.8
C1	75-110	5.3	4.5	0.10				2.2	6.1	0.1	0.8
C2	110-150+	6.3	5.7	0.10				4.0	7.1	0.1	0.9

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)


A1	0-13	24.8	11.9	20	33	14	20
A2	13-27	24.2	10.8	14	30	14	30
B21	27-45	30.4	17.2	14	23	8	46
B22	45-75	31.0	22.0	8	17	8	68
C1	75-110	33.4	23.5	6	13	6	77
C2	110-150+	34.7	25.3	6	13	5	80

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

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