WCSS09

Location: Mirranatwa

Australian Soil Classification: Bleached-Mottled, Eutrophic, Brown CHROMOSOL (thick surface horizon)
General Landscape Description: Rolling low hills - dissected Tertiary peneplain
Site Description: Grazing paddock – never limed. Paired catchment experimental site.

WCSS09 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-17 cm	Very dark greyish brown (10YR3/2); loam; weak coarse to medium blocky, parting to moderate coarse to medium granular structure; very weak to weak consistence, dry; pH 5.8; clear change to:	WCSS09 Profile	Soil pit 2-3 m depth
A2	17-50 cm	Pale brown (10YR6/3), conspicuously bleached (10YR 7/1 dry); light fine sandy clay loam; massive ; firm (dry) consistence; fine to coarse macropores common; pH 6.1; clear change to:
Subsoil
B21	50-90 cm	Yellowish brown (10YR5/6) with yellowish red (5YR 5/6) mottles and brown 10YR 4/3 cutans; medium clay; weak coarse prismatic, parting to strong coarse subangular blocky (dark faces), further parting to strong medium to fine polyhedral structure; shiny-faced peds; very firm to strong consistence (dry); few (2%) soft (2-3 mm) manganiferous segregations and ferromanganiferous nodules (2-3 mm size); surface material down cracks to 100 cm; pH 6.7; gradual change to:
B22	90-130 cm	Yellowish brown (10YR5/6) with greyish brown (10YR5/2), grey (10YR6/1) and red (2.5YR4/6) mottles; heavy clay; weak medium prismatic, parting to strong medium to fine subangular blocky structure; shiny-faced peds; very firm to strong consistence (dry); pH 6.4; gradual change to:
B23	130-150+ cm	Grey (10YR6/1) with brownish yellow (10YR6/8) and red (2.5YR5/6) mottles; medium clay; strong coarse to medium subangular blocky structure; very few (<1%) ferromanganiferous nodules; pH 6.6.

Key Profile Features:

Strong texture contrast between surface (A) horizons and subsoils (B21) horizon.
Conspicuously bleach subsurface (A2) horizon.
Well structured subsoil horizons (with shiny-faced peds).

Soil Profile Characteristics:

-	pH	Salinity	Sodicity	Dispersion
Surface Soil (A1 horizon)	Moderately Acid	Very Low	Non-Sodic	None
Subsoil (50-90 cm)	Slightly Acid	Very Low	Non-Sodic	None
Deeper Subsoil (130-150 cm)	Slightly Acid	Low	Non-Sodic	None

Chemical and Physical Analysis:

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC dS/m	Organic Carbon %	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	0-17	5.8	5.2	0.09	3.2	11	10	3.4	1.6	0.23	0.14	14	36	17	16	22.2	8
A2	17-50	6.1	5.1	<0.05			4	1.5	1.1	0.22	<0.05	16	49	16	14	18.3	4.4
B21	50-90	6.7	6.0	0.15			7.8	4.3	7	1.3	0.13	4	54	6	70	41.4	23.1
B22	90-130	6.4	6.0	0.36			6.6	3.2	7.2	0.94	0.08	4	15	9	66	41.7	23
B23	130-150+	6.6	6.1	0.45			5.5	2.3	6.4	1.3	0.07	9	26	11	52	58.9	18.3
	300	5.7	5.4	0.83

Profile Described By: Mark Imhof and David Rees, 30th March 2010.

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