CRC15

Location: Telegraph Hill

Australian Soil Classification: Bleached-Mottled, Magnesic, Red KUROSOL
Site Description:Grazing paddock - CRC plant evaluation site.
Geology: Metamorphic (schist/gneiss) ridge (aureole) between Ordovician (thinly bedded shale) uplands and intrusive gneiss (Devonian granite) on lower northern slopes.

CRC15 Landscape

A1	0-10 cm	Very dark greyish brown (10YR3/2); fine sandy loam; pH 5.6:	CRC15 Profile
A21	10-15 cm	Light yellowish brown (10YR6/4); conspicuously bleached (10YR8/2 dry); fine sandy loam; pH 5.0:
A22	15-30 cm	Light brown (7.5YR6/4); fine sandy loam; pH 5.0:
Subsoil
B21	30-55 cm	Yellowish red (5YR4/6); medium clay; strong coarse medium-fine blocky structure; pH 5.2:
B22	55-80 cm	Yellowish red (5YR5/6) with brownish yellow (10YR6/8) mottles; light medium clay; strong coarse medium-fine blocky structure; pH 5.9:
B23	80-110 cm	Brownish yellow (10YR6/6) with red (2.5YR5/6) mottles; silty clay loam; pH 6.4:
B/C	110+ cm	Silty loam; with some manganese staining [mangans]) in patches mixed with weathering schist; pH 7.1.

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

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Moderately Acid	Very Low	Non-Sodic	None
Subsoil (B21c horizon)	Strongly Acid	Very Low	Non-Sodic	None
Deeper subsoil (at 110+ cm)	Slightly Alkaline	Very Low	Non-Sodic	Strong

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl2)	EC dS/m	Exchangeable Aluminium ppm	Exchangeable Acididty meq/100g	Exchangeable Cations				Coarse Sand (0.2-2.0 mm) %	Fine Sand (0.02-0.2 mm) %	Silt (0.002-0.02 mm) %	Clay (<0.002 mm) %
							Ca	Mg	K	Na
							meq/100g
A1	0-10	5.6	5.0	0.07	<10	8.1	4.2	1.6	0.19	0.19	14	56	13	6
A22	15-30	5.0	4.4	<0.05	55	4.8	0.45	0.31	0.07	0.17	9	65	20	8
B21	30-55	5.2	4.4	<0.05	120	11	2.3	2.1	0.21	0.11	1	22	18	59
B22	55-80	5.9	5.3	<0.05	<10	6.2	0.39	4.7	0.33	0.23	2	32	24	42
B23	80-110	6.4	5.7	<0.05
B/C	110+	7.1	5.9	<0.05

• The levels of exchangeable calcium are very low compared to levels of exchangeable manganese (i.e. magnesic) in the subsoil (below 55 cm depth). This indicates that nutrient imbalances (e.g. calcium deficiency) may occur.
• The deep subsoil (from 110 cm depth) becomes strongly dispersive, which will result in restricted water movement at depth.