Victorian Resources Online (archived)

PVI1

Location: PVI Hamilton

Australian Soil Classification: Ferric, Eutrophic, Brown SODOSOL (thick, clay loamy surface)
Northcote Factual Key: Dy 3.42

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 cereal crop.

PVI1 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-10 cm	Dark brown (10YR3/3); fine sandy clay loam; very weak consistence (dry); pH 5.0; abrupt change to:	PVI1 Profile
A21	10-15 cm	Brown (10YR4/3) conspicuously bleached (10YR7/3 dry); fine sandy clay loam; weak consistence (dry); rusty root channel mottling; abrupt change to:
A22	15-40 cm	Brown (10YR5/3); conspicuously bleached (10YR7/3 dry); fine sandy clay loam; weak consistence (dry); very many (70%) ferruginous nodules (2-10 mm); pH 6.0; abrupt and wavy change to:
Subsoil
B21	40-50 cm	Yellowish brown (10YR5/4) with many (30%) yellowish red (2.5YR4/6) and brownish yellow (10YR6/8) mottles; medium clay; moderate coarse blocky, parting to strong medium to fine blocky structure; very firm consistence (moist); few (3-5%) ferruginous nodules; pH 6.6; clear change to:
B22	50-90 cm	Brown (10YR4/3) with yellowish brown (10YR5/8) and dark red (2.5YR4/8) mottles; medium clay; moderate to strong coarse blocky, parting to strong medium to fine blocky structure; shiny ped faces; firm consistence (moist); pH 6.9; abrupt change to:
B23	90 -120 cm	Light grey (10YR7/1) with yellow (10YR7/8) and dark red (2.5YR4/6) mottles; pH 7.4:
B24	120+ cm	Grey (5Y6/1) with light yellowish brown (2.5Y6/4) mottles; heavy clay; firm consistence (moist).
Note: Weathered basalt material commences at depths of between 90 to 120 cm in the soil profile. Key Profile Features: Strong texture contrast between surface (A) horizons and subsoil (B21) horizon. Conspicuously bleached subsurface (A2) horizon. Large amount of ferruginous nodules in the subsurface (A2) horizon.

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface soil (A1 horizon)	Strongly Acid	Low	Non-Sodic	None
Upper subsoil (B21 40-50 cm)	Slightly Acid	Low	Marginally Sodic	None¹
Deep subsoil (B23 90 - 120 cm)	Slightly Alkaline	Low	Sodic	Moderate-Strong

¹ Strong dispersion after remoulding.

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl₂)	EC 1:5	Exchangeable Cations
					Ca	Mg	K	Na
					meq/100g
A11	0-10	5.0	4.1	0.24	4.9	2.5	0.47	0.30
A22	15-40	6.0	4.8	0.05	3.0	1.8	0.11	0.29
B21	40-50	6.6	5.1	0.08	3.9	6.9	0.14	1.6
B22	50-90	6.9	5.5	0.09	4.4	7.7	0.14	1.6
B23	90-120	7.4	6.8	0.24	7.5	16	0.14	4.5

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)


A11	0-10	22		43	16	8	30	25	28
A22	15-40	<10		26	12	16	31	24	27
B21	40-50		11	44	28	3	12	11	74
B22	50-90		9.9	50	30	8	12	13	68
B23	90-120	<10		59	37	2	8	15	75

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

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