IS7

Location: Murtoa

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

Northcote Factual Key: Ug 5.24
Great Soil Group: grey clay
Soil Type: Kalkee Clay

General Landscape Description: Hillslope of a gently undulating plain.
Geology: Quaternary Woorinen Formation: aeolian dune sand, calcareous clay.

A1	0-15 cm	Grey (10YR5/1); medium clay; subplastic; cracking and self-mulching surface condition; weak subangular blocky structure; strong consistence dry; slightly sticky consistence wet; pH 8.8; sharp boundary to:
Subsoil
B21	15-25 cm	Grey (10YR5/1); light medium clay; subplastic; weak coarse subangular blocky structure; strong consistence dry; slightly sticky consistence wet; pH 9.3:
B22	25-55 cm	Grey (10YR5/1); light medium clay; subplastic; weak coarse subangular blocky structure; strong consistence dry; slightly sticky consistence wet; very few (<2%) soft carbonate segregations; pH 9.4:
B23	55-110 cm	Grey (10YR5/1); heavy clay; subplastic; weak coarse subangular blocky structure; strong consistence dry; slightly sticky consistence wet; very few (<2%) soft carbonate segregations; pH 9.3:
B31	110-135 cm	Brown (10YR5/3); medium heavy clay; subplastic; moderate coarse blocky structure; strong consistence dry; moderately sticky consistence wet; pH 8.9:
B32	135-190	Brown (10YR5/3); medium heavy clay; subplastic; moderate coarse blocky structure; strong consistence dry; moderately sticky consistence wet; pH 9.0.

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 %	Exchangeable Acidity cmol-/kg	Organic Carbon %	Permanent Wilting Point -1500okPa	Coarse Sand %	Fine Sand %	Silt %	Clay %
A1	0–15	8.8	0.21	0.01	31.6	4.9	1.8	2.7	0.11	0.8		27.3	12	16	8	59
B21	15–25	9.3	0.31	0.02	25.5	10.7	1.7	6.2	0.06		0.48	26.0	11	13	8	61
B22	25–55	9.4	0.47	0.04	18.9	12.9	1.7	10.7	0.06		0.42	26.4	12	14	6	63
B23	55–110	9.3	0.92	0.11	13.5	13	1.8	15.5	0.04		0.33	28.2	9	13	8	62
B31	110–135	8.9	1.38	0.19	11	11.2	1.4	16.6	0.03		0.13	26.7	14	13	9	59
B32	135–190	9.0	1.41	0.21								28.5	11	13	10	62
B33	190–220	9.0	1.47	0.18								28.6	10	13	10	63

• Sodic surface, possible surface sealing/impeded infiltration despite some self-mulching characteristic.
• High calcium levels in upper subsoil, high magnesium levels in lower subsoil.
• Sodic subsoil, strongly sodic below 25 cm, increasing with depth.
• Landform element, hillslope; imperfect to moderate site drainage.
• Cracking clay profile.
• Highly alkaline soil throughout.