SM05

Location: Gatum

Australian Soil Classification: Ferric, Mottled-Subnatric, Grey SODOSOL

General Landscape Description: Undulating dissected peneplain.
Site Description: Flat within a drainage depression.
Land Use: Grazing.
Geology: Neogene sediments.

Image: SM05Landscape
SM05 Landscape

Soil Profile Morphology:

Surface Soil
A10	0-10 cm	Very dark greyish brown (10YR3/2); firm surface condition; fine sandy clay loam; moderate medium polyhedral, parting to moderate fine polyhedral structure; rough fabric; many medium sized roots; pH 5.2; abrupt change to:	SM05 profile
A11	10-23 cm	Brown (7.5YR4/2) with common faint reddish brown (5YR4/4) root line mottles; fine sandy clay loam; moderate medium polyhedral, parting to very fine polyhedral structure; rough fabric; weak consistence moderately moist; many medium and fine roots present; pH 5.8; abrupt and wavy change to:
A2	23-32 cm	Greyish brown (10YR5/2), sporadically bleached; fine sandy loam; massive; weak consistence moderately moist; abundant ferruginous concretions; many medium and fine roots present; pH 6.3; sharp and wavy change to:
Subsoil
Subsoil
B21	32-55 cm	Dark grey (7.5Y4/1) with distinct yellowish brown (10YR5/6) mottles common; medium clay; moderate coarse polyhedral, parting to fine polyhedral structure; smooth fabric; firm consistence moist; very few ferruginous concretions; common fine roots present; pH 6.5; gradual change to:
B22	55-100 cm	Brownish yellow (10YR6/6) with many prominent light grey (2.5Y7/1) mottles; medium clay; strong medium polyhedral, parting to very fine polyhedral structure; smooth fabric; firm consistence moist; few manganiferous coatings; few fine roots present; pH 6.8; sharp change to:
C1	100-130 cm	Strong brown (7.5YR5/6) with many prominent dark red (2.5YR4/6) and dark greyish brown (10YR4/2) mottles; light medium clay (sandy); massive; earthy fabric; strong consistence moist; strongly cemented thin ferricrete continuous pan; many ferruginous nodules; few fine and very fine roots present; pH 6.3; clear change to:
C2	130-160+ cm	Yellowish brown (10YR5/8) with many prominent light grey (5YR7/1) and dark red (2.5YR4/6) mottles; light medium clay (sandy); massive; earthy fabric; firm to strong consistence moist; strongly cemented thin ferricrete continuous pan; abundant ferruginous nodules; few fine roots present; pH 5.9.

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Strongly Acid	Medium	Non-Sodic	None
Subsoil (B21 horizon)	Slightly Acid	Low	Sodic	None¹
Deeper Subsoil (at 70-100 cm)	Moderately Acid	High	Sodic	None

¹ Slight dispersion after remoulding.

Image: SM05 Graphs

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

The salinity rating is medium in the surface soil. The upper subsoil has a low salinity rating becoming high with depth.

The surface is non-sodic. The subsoil is sodic throughout.

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

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC dS/m	Total Carbon g/100g	Exchangeable Acidity meq/100g	Exchangeable Aluminium mg/kg	Exchangeable Cations
								Ca	Mg	K	Na
								meq/100g
A10	0-10	5.2	4.5	0.24	4.4	13	24	3.2	2.4	0.2	0.9
A11	10-23	5.8	4.8	0.09				2.1	1.6	0.1	0.4
A2	23-32	6.3	5.4	0.11				1.6	1.8	0.1	0.7
B21	32-55	6.5	5.5	0.19		8.3		4.5	6.7	0.2	2.0
B22	55-100	6.8	6.4	0.87				3.9	6.1	0.2	1.4
C1	100-130	6.3	5.8	0.56				2.1	3.5	0.1	0.8
C2	130-160+	5.9	5.4	0.55		5.7		2.6	4.5	0.1	1.3

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)


A10	0-10	23.1	9.7	18	36	18	19
A11	10-23	19.5	7.2	15	37	20	18
A2	23-32	17.8	10.0	12	33	18	28
B21	32-55	27.3	18.3	10	18	12	57
B22	55-100	32.2	19.2	10	18	10	63
C1	100-130	20.7	12.6	13	26	13	45
C2	130-160+	25.6	18.1	11	21	13	52

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

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