IS20

Location: Drung Drung

Soil Type: Haven Sandy Clay Loam

Australian Soil Classification: Hypocalcic, Subnatric, Grey SODOSOL

Northcote Factual Key: Dy 2.33
Great Soil Group: solodic soil

General Description: Terrace flat.
Geology: Quaternary Coonambidgal Formation: fluvial to lacustrine clays and sands

Image: IS20 Llandscape
IS20 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-5 cm	Greyish brown (10YR5/2) sandy clay loam; plastic; hardsetting surface condition; weak coarse blocky structure; strong consistence dry, slightly sticky consistence wet; pH 6.6; sharp and smooth change to:	IS20 Profile
Subsoil
B21	5-30 cm	Grey (10YR5/1) light clay; subplastic; weak coarse subangular blocky structure; strong consistence dry, moderately sticky consistence wet; pH 7.5; gradual change to:
B22	30-60 cm	Grey (5Y5/1) light clay; subplastic; weak coarse blocky structure; strong consistence dry, moderately sticky consistence wet; contains a trace (<2%) amount of hard carbonate; pH 8.9; gradual and smooth change to:
B23	60-85 cm	Grey (5Y5/1) light clay; subplastic; weak coarse blocky structure; strong consistence dry, moderately sticky consistence wet; contains a trace (<2%) amount of hard carbonate; pH 8.0:
B24	85-100 cm	Grey (5Y5/1) medium clay; subplastic; weak coarse blocky structure; strong consistence dry, moderately sticky consistence wet; contains a trace (<2%) amount of hard carbonate; pH 7.7.

Chemical and Physical Analysis:

Horizon	Sample Depth cm	pH H₂O	EC dS/m	Sodium Chloride %	Exchangeable Calcium cmol-/kg	Exchangeable Magnesium cmol-/kg	Exchangeable Potassium cmol-/kg	Exchangeable Sodium cmol-/kg	Total Nitrogen %	Organic Carbon %	Bulk Density	Exchangeable Acidity cmol-/kg	Field Capacity -30^okPa	Permanent Wilting Point -1500^okPa	Coarse Sand %	Fine Sand %	Silt %	Clay %
Horizon	Sample Depth cm	pH H₂O	EC dS/m	Sodium Chloride %	Exchangeable Calcium cmol-/kg	Exchangeable Magnesium cmol-/kg	Exchangeable Potassium cmol-/kg	Exchangeable Sodium cmol-/kg	Total Nitrogen %	Organic Carbon %	Bulk Density	Exchangeable Acidity cmol-/kg	Field Capacity -30^okPa	Permanent Wilting Point -1500^okPa	Coarse Sand %	Fine Sand %	Silt %	Clay %
A1	0–5	6.6	0.15	0.03	5	7.3	0.8	1	0.1	5.0	1.22	6	23.5	12.6	6	46	15	33
B21	5–30	7.5	0.19	0.03	9.1	13.8	0.9	2.9	0.06	0.49	1.51	2.9		19.1	4	27	13	54
B22	30–60	8.9	0.46	0.06	9.8	15.1	1	4.1	0.05	0.48	1.45	4.2		19.8	3	24	16	55
B23	60–85	8.0	0.9	0.1	9.8	15.1	1.1	4.6	0.04	0.38	1.49	3		19.8	4	24	17	55
B24	85–100	7.7	2.16	0.12	11.6	16.2	1.1	5.4	0.02	0.22	1.51	2.4		21.7	2	20	17	58
B25	100-150	8.5	0.81	0.12	9.2	15.5	1.2	5.3	0.02	0.11		2.2		21.6	4	22	16	56
B26	150-215	9.0	0.77	0.12											6	18	12	58

Note: NA=not assessed.

Management Considerations:

Texture contrast soil, possible cracking clay (vertosol)
Slightly acid to neutral thin surface soil over neutral to alkaline subsoil
Hard setting, coarsely structured surface soil, not ideal for plant establishment
Subsoil has vertic properties, including subplasticity (feels lighter than lab data suggests), limited obvious structure
Subsoil is slightly sodic (subnatric), more sodic at depth and high magnesium
Yellow hue (5Y) would suggest reducing conditions , poor internal drainage as clay in subsoil expands
Landscape element, terrace flat; slow site drainage unless near drainage line

Profile Described By: John Martin, Nabil Badawy, Ron Cawood, Geoff Pope, John Galea, John Turner (1970).

Reference: "Major Agricultural Soils of the Wimmera Irrigation Area". John Martin, Mark Imhof, Lourey Ruth, Rob Nink, Karen DePlater, Paul Rampant, Sonia Thompson, S. Alexander. Department of Natural Resources and Environment, Victoria. 1996.

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