WCSS01a

Location: Hamilton.

Australian Soil Classification: Eutrophic (& Ferric in some areas), Mottled-Subnatric, Brown SODOSOL

Site Description: Nitrous oxide trial site.

WCSS01-02 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-9 cm	Dark brown (7.5YR3/2); fine sandy clay loam; moderate coarse blocky, parting to moderate to strong medium to fine subangular blocky structure; very firm consistence (dry); pH 5.3; clear and wavy change to:	WCSS01 profile
A21	9-20 cm	Dark brown (7.5YR3/2) with light grey (10YR7/2) root mottling, some sporadic bleaching; fine sandy clay loam; moderate coarse to medium subangular block structure; weak to very firm consistence (moist); pH 5.3 (lab); clear and wavy change to:
A22	20-50 cm	Pale brown (10YR6/3) conspicuously bleached; very fine sandy loam+; weak coarse to medium blocky structure; weak to very firm consistence (moist); pH 6.0 (lab); buckshot in nearby pockets; slight transition to B2; clear and wavy change to:
Subsoil
B21	50-75 cm	Dark yellowish brown (10YR4/4) with abundant very coarse very dark grey (10YR3/1) and red (2.5YR4/6) mottled; medium clay; moderate to strong medium to weak subangular blocky structure; firm consistence (moist); pH 5.8 (lab); very few medium ferromanganiferous segregations; clear and wavy change to:
B22	75-100 cm	Yellowish brown (10YR5/4) with abundant coarse red (2.5YR4/6) and light brownish grey (10YR6/2) mottles; medium clay; firm consistence (moist); pH 6.0; gradual change to:
B23	100-130 cm	Yellowish brown with abundant grey (10YR5/1) mottles; medium clay; very firm (moist) consistence; pH 6.3 (lab); many medium ferromanganiferous segregations (20%); clear change.
B3	130-150 cm	Weak red (2.5YR5/2) with red (2.5YR5/4) mottles; medium heavy clay; strong medium to fine lenticular structure; strong consistence (moist); pH 6.5.
C	150+ cm	Medium clay; pH 6.0; weathered basalt.

Key Profile Features:

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

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Strongly Acid		Non-sodic	None
Subsoil (B21 horizon)	Moderately Acid	Very low		None ¹
Deeper subsoil (at 130-150 cm)	Slightly Acid	Very low	Strongly sodic	None
¹Strong dispersion after remoulding.

WCSS01 graphs <p>]

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC ds/m	Organic Carbon g/100g	Available Aluminium mg/kg	Exchangeable Cations
							Ca	Mg	K	Na
							meq/100g
A11	0-9	5.3	5.0	0.71	5.5	<10	6.4	2.7	0.34	0.1
A21	9-20	5.3	4.8	0.10	1.7	15	2.5	1.5	0.09	0.16
A22	20-50	6.0	5.0	0.09		13	1.9	5.9	0.09	1.0
B21	50-75	5.8	5.1	0.06			1.3	1.1	<0.05	0.15
B22	75-100	6	5.3	0.17	0.4		2	6.8	0.14	2
B23	100-130	6.3	5.6	0.27			2.1	6.1	0.1	1.9
B3	130-150	6.5	6.5	0.26			3.7	13	0.06	5.3

Horizon	Horizon Depth (cm)	Exchangeable Aluminium mg/kg	Exchangeable Acidity meq/100g	Field Capacity pF2.5	Wilting Point pF4.2	Coarse Sand (0.2-2.0mm)	Fine Sand (0.02-0.2mm)	Silt (0.002-0.02mm)	Clay (<0.002mm)


A11	0-9		14	44	16.3	2	42	27	21
A21	9-20		7.4	28.2	7.4	6	44	32	17
A22	20-50		8.7	19.3	5.2	16	43	27	14
B21	50-75		3.5	30.4	16.2	10	31	18	42
B22	75-100		8.8	34.1	19	7	26	15	50
B23	100-130	<5	7.4	33.3	18.1
B3	130-150	<5	8.7	61.6	31

Profile Described By: Mark Imhof and David Rees (May 2010).

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