SW58

Location: Cooriemungle.

Australian Soil Classification: Humose, Kurosolic, Redoxic HYDROSOL

Site Description: Drained dairy grazing paddock.
General Landscape Description: Flat valley floor in dissected plain.
Geology: Quaternary alluvium derived from Gellibrand Marl and Hanson Plain Sand.

SW58 Landscape

A1	0-30 cm	Very dark brown (10YR2/2); clay loam; weak medium polyhedral structure; weak consistence dry; pH 5.9; clear and smooth change to:	SW58 Profile. Note: Surface (A1) has been stripped from the soil profile.
Subsoil
B21	30-45 cm	Black (10YR2/1) with reddish yellow (5YR6/8) mottles common, mainly in root channels; medium clay; coarse polyhedral, parting to medium blocky structure; weak consistence dry; pH 5.3; abrupt and smooth change to:
B22g	45-75 cm	Dark grey (10YR4/1) with brownish yellow (10YR6/8) mottles common; medium clay; medium prismatic, parting to medium blocky structure; firm consistence dry; pH 5.5; clear and smooth change to:
B23g	75+ cm	Grey (10YR5/1) with many reddish yellow (7.5YR6/8) mottles; heavy clay; very coarse prismatic structure (larger at depth) parting to coarse blocky structure; very firm consistence dry; pH 5.8; strong sulphidic smell i.e. anaerobic.

• Strong texture contrast between surface (A1) horizon and subsoil (B21) horizon.
  

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Moderately Acid	Low	Non-Sodic	None
Subsoil (B21 horizon)	Strongly Acid	Low	Non-Sodic	None
Deeper Subsoil (at 75-130 cm)	Moderately Acid	Low	Non-Sodic	None

The surface is moderately acid. The subsoil is strongly acid.

The salinity rating is low throughout the profile.

The clay content increases markedly at the surface / subsoil boundary.

Exchangeable Aluminium increases to very high levels in the subsoil.

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl2)	EC (dS/m)	Exchangeable Cations
					Ca	Mg	K	Na
					meq/100g
A1	0-30	5.9	5.4	0.22	12	2.8	0.4	0.46
B21	30-45	5.3	4.5	0.16	8.2	5.2	0.38	0.8
B22	45-75	5.5	4.6	0.11	5.1	5.2	0.34	0.71
B23g	75-130	5.8	4.8	0.1	3.4	3.8	0.23	0.54
B23g	130-150	5.8	5	0.15

Horizon	Horizon Depth (cm)	Oxidisable Organic Carbon %	Total Nitrogen %	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)
A1	0-30	4.8	0.4	<10	13	36	15	5	46	21	19
B21	30-45			140	18	39	22	5	20	21	46
B22	45-75			110	12	36	24	9	28	20	40
B23g	75-130			22	5.4	25	13	13	39	23	26
B23g	130-150

• The soil profile will be saturated for a number of months during most years. Drainage will be required for agricultural use.

• An additional subsoil horizon was sampled 10 m west of profile called SW57 to ensure adequate coverage of soil variability at this site.
• Exchangeable aluminium levels are reasonably high in the strongly acid upper subsoil. This may restrict the growth of aluminium sensitive species.