PVI3

Location: PVI Hamilton

Australian Soil Classification: Ferric, Eutrophic, Brown CHROMOSOL (thick, clay loamy surface)
Northcote Factual Key: DY3.42
Great Soil Group: Possibly yellow podzolic.

Geology: Tertiary/Quaternary basalt.
General Landscape Description: Mid-slope of a low rise.
Soil Mapping Unit: Monivae gravelly loam (slope phase).

Site Description: Edge of a cereal cropping paddock.

PVI3 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-15 cm	Dark brown (10YR3/3); very fine sandy clay loam; weak coarse blocky structure; weak consistence (dry); pH 5.6; clear change to:	PVI3 Profile
A21	15-30 cm	Dark brown (10YR3/3); sporadically bleached; very fine sandy clay loam; firm consistence (dry); many (40%) ferruginous nodules; pH 6.3; clear change to:
A22	30-40 cm	Clay loam (very fine sandy); massive; very firm consistence (dry); very many (60%) ferruginous nodules; pH 6.6; clear change to:
Subsoil
B21	40-65 cm	Yellowish brown (10YR5/6) with many (40%) brownish yellow (10YR6/8) and yellowish red (5YR5/8) mottles; light medium clay; weak medium prismatic, parting to strong coarse to medium blocky structure; strong consistence (dry); very many (60%) ferruginous nodules (2-10 mm); few (5%) ferruginous basalt fragments (5-8 mm); some manganese staining; pH 6.8; gradual change to:
B22	65-120 cm	Yellowish brown (10YR5/4) with many (40%) strong brown (7.5YR5/8) and yellowish red (5YR5/8) mottles; light medium clay; weak medium prismatic, parting to strong coarse to medium to fine blocky structure; few (5%) ferruginous basalt fragments; strong consistence (dry); pH 6.5; gradual change to:
B23	120+ cm	Yellowish brown (10YR5/4) with light grey (10YR7/1), reddish yellow (7.5YR6/8) and dark red (2.5YR4/8) mottles; medium heavy clay; firm consistence (moist); pH 6.5.

Key Profile Features:

Strong texture contrast between surface (A) horizons and subsoil (B21) horizons.
Large amount of ferruginous nodules in subsurface (A2) horizon.

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface Soil (A1 horizon)	Moderately Acid	Low	Non-Sodic	None
Upper Subsoil (40 - 65 cm)	Slightly Acid	Low	Non-Sodic	None
Deeper Subsoil (120 cm)	Slightly Acid	Low	Non-Sodic	None

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC 1:5	Exchangeable Cations
					Ca	Mg	K	Na
					meq/100g
A1	0-15	5.6	4.3	0.07	4.8	2.4	0.14	0.27
A2	15-30	6.3	5.0	0.06	3.8	2.6	0.11	0.37
A22	30-40	6.6	5.4	0.07	4.9	3.9	0.13	0.52
B21	40-65	6.8	5.7	0.12	5.5	6.5	0.22	1.0
B22	65-120	6.5	5.8	0.14	5.2	7.2	0.20	1.3
B23	120+	6.5	6.2	0.17	3.9	6.9	0.14	1.5

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


A1	0-15	12		35	13	4	40	26	25
A2	15-30	<10		28	11	14	37	20	26
A22	30-40			27	13	20	28	15	34
B21	40-65		9.3	42	25	8	16	10	66
B22	65-120		9.9	47	27	7	16	9	67
B23	120+

Profile Described By: Mark Imhof, Paul Rampant (January /2001).

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