DU57

Location: Nirranda South

Australian Soil Classification: Vertic (& Ferric), Eutrophic, Brown CHROMOSOL

General Landscape Description: Upper slope of a gently undulating rise.
Site Description: Grazing paddock.

DU57 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-15 cm	Very dark brown (10YR2/2); sandy loam; firm consistence dry; pH 5.4; clear change to:	DU57 Profile
A2	15-50 cm	Light yellowish brown (2.5Y6/4) conspicuously bleached (10YR8/2 dry) ; loamy sand; apedal; weak consistence dry; many (50%) ferruginous nodules (2-20 mm in size); pH 5.7; sharp change to:
Subsoil
B21	50-80 cm	Yellowish brown (10YR5/4) with reddish yellow (7.5YR6/8) mottles; medium clay; moderate coarse blocky structure; strong consistence dry; pH 6.3; gradual change to:
B22	80-120 cm	Light olive brown (2.5Y5/4) with brownish yellow (10YR6/6) and yellowish red (5YR5/6) mottles; medium heavy clay; moderate medium polyhedral, parting to strong fine polyhedral structure; few ferruginous nodules (20-30 mm in size); pH 6.2; gradual change to:
B23	120-160 cm	Brownish yellow (10YR6/8) with red (2.5YR5/6) and light grey (10YR7/1) mottles; medium heavy clay; moderate lenticular structure; many (20%) ferruginous nodules (10-20 mm in size); pH 6.0; clear change to:
B3	160+ cm	Grey (10YR6/1) with strong brown (7.5YR5/8) and red (2.5YR5/6) mottles; medium heavy clay; strong medium to fine lenticular structure; weak consistence (moist); pH 6.4.

Lenticular structure in deeper subsoil.

Key Profile Features:

Lenticular structure in deeper subsoil.

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Strongly Acid	Low	Non-Sodic	None
Subsoil (B21 horizon)	Slightly Acid	Very Low	Non-Sodic	None
Deeper subsoil (at 80-120 cm)	Slightly Acid	Very Low	Non-Sodic	None

The surface soil is strongly acid. The subsoil is slightly acid.

The salinity rating in the surface is low, the subsoil is very low.

The whole profile in non sodic.

The clay content increases sharply at the subsoil boundary.

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC dS/m	Exchangeable Cations
					Ca	Mg	K	Na
					meq/100g
A1	0-15	5.4	4.7	0.24	2.3	0.43	0.67	0.44
A2	15-50	5.7	5.1	<0.05	0.78	0.17	<0.05	0.09
B21	50-80	6.3	6.0	0.10	4.1	2.8	0.18	0.42
B22	80-120	6.2	6.1	0.13	3.3	5.0	0.26	0.59
B23	120-160	6.0	5.9	0.10	3.6	4.4	0.23	0.69
B24	160+	6.4	5.9	0.13	6.8	5.2	0.29	1.1

Horizon	Horizon Depth (cm)	Ammonium Nitrogen mg/kg	Nitrate Nitrogen mg/kg	Phosporus mg/kg	Oxidisable Organic Carbon %	Total Nitrogen %	Exchangeable Aluminium mg/100g	Exchangeable Acidity meq/100g	Bulk Density kg/L	Wilting Point pF4.2	Coarse Sand (0.2-2.0 mm)	Fine Sand (0.02-0.2 mm)	Silt (0.002-0.02 mm)	Clay (<0.002 mm)


A1	0-15	110	4.1	64	3.2	0.21	25	12.0	1.4	7.7	22	60	8	4
A2	15-50	2.3	<0.25	3			<10	3.1	1.3	3.0	23	62	9	5
B21	50-80	1.2	<0.25	<1			<10	7.2	1.4	17.7	14	36	5	45
B22	80-120						<10	8.7			8	23	5	65
B23	120-160
B24	160+

Profile Described By: Mark Imhof and Siegfried Engleitner (December 2003).

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