Location: Glenormiston College.
Australian Soil Classification: Melacic, Eutrophic, Brown CHROMOSOL
Northcote Factual Key: Db2.12
Great Soil Group: podzolic
Geology: Quaternary volcanic tuff deposits (Qvs) derived from Mt. Noorat.
General Landscape Description: Level Plain.
Site Description: Paddock reserve associated with a non-irrigated dairy paddock.
Site SW19 Landscape |
A11 | 0-30 cm | Very dark brown (10YR2/2); fine sandy clay loam; strong polyhedral, parting to fine polyhedral structure; slight compaction evident; weak consistence dry; pH 4.9; abrupt change to: | Site SW19 Profile |
A12 | 30-35 cm | Very dark brown (10YR2/2); fine sandy clay loam; very firm consistence dry; contains many (40%) manganese nodules (2-6 mm in size) as well as an ironstone accumulation and many dark root channels; pH 5.6; abrupt change to: | |
Subsoil | |||
B21 | 35-70 cm | Brown (7.5YR4/4); medium heavy clay; strong polyhedral, parting to fine polyhedral structure (shiny-faced peds); very firm consistence moist; contains few (5%) manganese nodules (2-5 mm in size) as well as worm casts; pH 6.4; clear change to: | |
B22 | 70-100 cm | Brown (7.5YR4/4) with slight strong brown (7.5YR5/6) mottles; medium clay; moderate coarse polyhedral, parting to strong fine polyhedral structure; very firm consistence moist; contains few (2%) manganese nodules (2-5 mm in size) as well as few (10%) manganese stains; pH 7.0; abrupt change to: | |
C1 | 100-120 cm | Mainly weathered yellow brown volcanic tuff: | |
C2 | 120+ cm | Dark brown (7.5YR3/3); volcanic tuff; contains some olivine. |
pH | Salinity Rating | |||
Surface (A1 horizon) | very strongly acid | low | non-sodic | none |
Subsoil (B21 horizon) | slightly acid | very low | non-sodic | none |
Deeper subsoil (at 1m) | neutral | very low | non-sodic | none |
The surface is very strongly acid. The subsoil is slightly acid, becoming neutral at 80 cm depth. | The salinity rating is low to very low throughout the profile. | The clay content increases abruptly at the A/B horizon boundary. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
A12 | 30-35 | 5.6 | 4.7 | 0.06 | 7.1 | 2.6 | 0.46 | 0.33 |
B21 | 35-70 | 6.4 | 5.4 | <0.05 | 14 | 8.8 | 0.81 | 0.52 |
B22 | 70-100 | 7 | 6.2 | 0.08 | 13 | 15 | 0.66 | 0.74 |
Horizon | Horizon Depth (cm) | 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) |
A12 | 30-35 | 16.4 | 24 | 23 | 18 | 29 |
B21 | 35-70 | 28.9 | 9 | 12 | 5 | 65 |
B22 | 70-100 | 29.6 | 5 | 18 | 14 | 57 |