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:
| |||
Soil Profile Characteristics:
pH | Salinity Rating | |||
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 |
 |  |  |  |
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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