IS19

Location: Drung Drung

Australian Soil Classification: Episodic-Epicalcareous, Self-Mulching, Grey VERTOSOL

Northcote Factual Key: Ug5.24
Great Soil Group: grey clay
Soil Type: Horsham Clay.

General Landscape Description: Anastomotic plain.
Geology: Quaternary Shepparton Formation: fluvial silt, sand and minor gravel.

A1	0-10 cm	Dark grey (10YR4/1); light clay; subplastic; cracking and self-mulching surface condition; weak subangular blocky structure; weak consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 6.8; sharp and wavy boundary to:	IS19 Profile
Subsoil
B21	10-25 cm	Dark grey (10YR4/1); light clay; subplastic; moderate very coarse prismatic structure; strong consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 8.6.
B22	25-60 cm	Dark grey (10YR4/1); medium heavy clay; subplastic; moderate very coarse prismatic structure; weak consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 8.9; gradual and smooth boundary to:
B23	60-90 cm	Dark grey (10YR4/1); heavy clay; plastic; coarse lenticular structure (slickensides); very few (<2%) hard carbonate segregations; pH 9.2; gradual boundary to:
B31k	90-130 cm	Greyish brown (10YR5/2); heavy clay; plastic; coarse lenticular structure (slickensides); few (2-10%) hard carbonate segregations; pH 9.3; gradual boundary to:
B32	130-195	Greyish brown (10YR5/2); medium clay; plastic; moderate angular blocky structure; very strong consistence dry; slightly sticky consistence wet; very few (<2%) hard carbonate segregations; pH 9.4.

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 -30okPa	Permanent Wilting Point -1500okPa	Coarse Sand %	Fine Sand %	Silt %	Clay %
A1	0–10	6.8	0.17	0.02	2.7	6.9	0.6	2	0.05	0.56	1.07	5.1	29.9	11.7	29	38	3	28
B21	10–25	8.6	0.12	0.01	22.9	10.3	1.7	0.8	0.05	0.54	1.43	3.6		22.4	9	21	9	61
B22	25–60	8.9	0.17	0.01	17	15.5	1.3	1.7	0.04	0.37	1.44	5.3		23.3	8	18	8	63
B23	60–90	9.2	0.24	0.03	13.4	19.8	1.5	3.3	0.03	0.3	1.33			25.5	7	17	9	64
B31k	90–130	9.3	0.33	0.02	11.5	20.8	1.5	5.4	0.03	0.24	1.38			26.7	8	15	9	65
B32	130–195	9.4	0.44	0.02										28.5	4	13	10	68

• Cracking clay profile, possible texture contrast.
• Sodic surface, possible surface sealing/impeded infiltration despite self mulching characteristic.
• High fine sand content of surface (possible windblown inclusions).
• High calcium levels in upper subsoil, high magnesium levels in lower subsoil.
• Sodic subsoil below 60 cm, increasing with depth.
• Landform element, plain; slow site drainage, unless near drainage line.