PVI2

Location: PVI Hamilton

Australian Soil Classification: Vertic (&Ferric), Eutrophic, Yellow SODOSOL (thick, clay loamy surface)
Northcote Factual Key: Dy3.42

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

Site Description: Edge of a cereal cropping paddock.

PVI2 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-20 cm	Brown (10YR4/3); very fine sandy clay loam; weak coarse blocky (occasionally parting to strong coarse to medium polyhedral structure); very weak consistence (dry); pH 5.5; clear change to:	PVI2 Profile
A21	20-40 cm	Yellowish brown (10YR5/4) with strong brown (7.5YR5/8) mottles; conspicuously bleached (10YR7/2 dry); fine sandy clay loam; massive; strong consistence (dry); pH 6.0; clear change to:
A22	40-55 cm	Yellowish brown (10YR5/4); conspicuously bleached (10YR7/2 dry); fine sandy clay loam; massive; firm consistence (dry); very many (80%) ferruginous nodules; (2-10 mm size); pH 6.3; abrupt and wavy change to:
Subsoil
B21	55-65 cm	Brownish yellow (10YR6/6) with brown (10YR4/3) and dark red (2.5YR4/8) mottles; medium clay; moderate coarse blocky, parting to strong medium blocky structure; some dark staining on ped faces; very firm consistence (moist); pH 7.1; clear change to: Note: In some areas the upper subsoil (B21 horizon) can be darker (10YR4/4) with brownish yellow (10YR6/6) mottles. In these areas, there is usually less ferruginous gravel in the A2 horizon. These variations are associated with the original gilgai micro-relief.
B22	65-90 cm	Brownish yellow (10YR6/8) with very dark greyish brown (10YR3/2) mottles; medium clay; moderate to strong coarse prismatic, parting to moderate to strong medium prismatic and moderate coarse to medium blocky structure; some manganese stains; very firm consistence (moist); pH 7.1; gradual change to:
B23	90-120+ cm	Brownish yellow (10YR6/6) with many (40%) light grey (2.5Y7/2) mottles; medium heavy clay; strong lenticular structure; firm consistence (moist); pH 7.2.

• Variation in soil profile features associated with gilgai micro-relief.
• Strong texture contrast between surface (A) horizons and subsoil (B) horizons.
• Thick conspicuously bleached subsurface (A2) horizons.
• Large amount of ferruginous nodules in the subsurface (A22) horizon.
• Vertic properties (i.e. lenticular peds) in the deep subsoil.

Horizon	Horizon Depth (cm)	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	0-20		37	11	4	40	29	19
A21	20-40		26	8	11	40	29	19
A22	40-55		17	9	55	16	13	15
B21	55-65	8.7	40	24	10	17	10	62
B22	65-90		50	30	1	10	7	81
B23	90-120		52	30	3	13	9	76