CRC14

Australian Soil Classification: Bleached-Mottled, Magnesic, Red KUROSOL
General Landscape Description: Upper slope of hill.
Site Description: Grazing paddock - CRC plant evaluation site.
Geology: Metamorphic aureole.

CRC14 Landscape

A1	0-12 cm	Brown (7.5YR5/4); fine sandy clay loam; weak-moderate blocky structure; firm consistence (dry); pH 5.3; clear change to:	CRC14 Profile
A2	12-30 cm	Reddish yellow (7.5YR6/6) conspicuously bleached (7.5YR7/4 dry); fine sandy loam+; weak to moderate medium-fine blocky; weak consistence (moderately moist); few (5-10%) quartz fragments (2-5 mm); pH 4.9; clear abrupt change to:
Subsoil
B21	30-45 cm	Dark red (2.5YR4/8); medium clay; strong medium to fine to very fine blocky structure; firm consistence (moderately moist); shiny-faced peds; pH 5.4:
B22	45-70 cm	Dark red (2.5YR4/8) with red (7.5YR6/8) mottles; medium clay; strong medium fine-very fine blocky structure; firm consistence (moderately moist); shiny-faced peds; pH 5.6:
B23	70-90 cm	Reddish yellow (7.5YR6/8) with dark red (2.5YR4/8) mottles; medium clay; strong very fine prismatic, parting to moderate to strong coarse-medium blocky structure; firm to very firm consistence (moderately moist); shiny-faced peds; pH 6.1:
B24	90-110 cm	Reddish yellow (7.5YR6/8) with yellowish red (5YR5/8) mottles; silty clay loam; moderate very coarse prismatic, parting to strong coarse blocky structure; very firm consistence (moderately moist); some weathered micaceous rock (very soft); pH 6.3:
B/C	110-130 cm	Yellowish brown (10YR5/4) with dark red (2.5YR4/8) mottles; silty clay loam; (together with weathered micaceous rock; pH 6.5:
C	130+ cm	Weathering micaceous rock.

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Strongly Acid	Very Low	Non-Sodic	None
Subsoil (B21c horizon)	Strongly Acid	Very Low	Non-Sodic	None
Deeper subsoil (at 70-110 cm)	Slightly Acid	Very Low	Non-Sodic	None1

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) %	Field Capacity % w/w	Wilting Point % w/w
							Ca	Mg	K	Na
							meq/100g
A1	0-12	5.3	4.5	0.07	39	9.2	1.2	0.76	0.51	0.23	6	63	5	25	22.1	4.7
A2	12-30	4.9	4.3	<0.05	85	6.5	0.34	0.32	0.15	0.14	16	54	16	12	20.7	4.1
B21	30-45	5.4	4.8	0.06	44	9.9	2.4	3	0.13	0.27	3	29	13	52	31.8	16.5
B22	45-70	5.6	5.1	<0.05	18	10	0.87	6.1	0.18	0.24	2	28	0	41	35.4	17.7
B23	70-90	6.1	5.3	<0.05	<10	9.3	0.55	7.7	0.30	0.39	4	33	17	45	35.9	16.2
B24	90-110	6.3	5.3	<0.05	<10	6.7	0.53	8.7	0.27	0.66					30.5	11.2
B/C	110-130	6.5	6.3	<0.05		6.0	0.27	12	0.28	0.90

• The levels of exchangeable calcium in much of the deeper subsoil (from 70 cm depth) are very low compared to levels of exchangeable magnesium (i.e. magnesic). This indicates that nutrient imbalance may occur (e.g. calcium deficiency).
• The upper subsoil is non-sodic and well structured (parting to fine blocky shaped peds). This will provide few restrictions to root and water movement in the subsoil The deeper subsoil becomes strongly magnesic and coarser structured (with some dispersion occurring after remoulding) which will restrict root and water movement to a larger degree.