Location: Boisdale. | Australian Soil Classification: Humose (and Sodic), Eutrophic, Black DERMOSOL. |
Geology: Holocene. | General Landscape Description: Avon flats. |
Mapping Unit: Thomson. | Site Description: Dairy grazing paddock. Floods occasionally. |
Site GP75 Landscape |
A1 | 0-30 cm | Very dark brown (10YR2/2); clay loam; moderate coarse blocky, parting to moderate medium polyhedral, parting to strong fine polyhedral structure; strong consistence dry; pH 5.4; gradual change to: | Site GP75 Profile |
Subsoil | |||
B21 | 30-55 cm | Very dark brown (10YR2/2); clay loam; weak coarse prismatic, parting to moderate medium polyhedral, parting to strong fine polyhedral structure; strong consistence dry; pH 6.0; clear change to: | |
B22 | 55-90 cm | Brown (7.5YR4/4); clay loam; weak coarse prismatic structure; strong consistence dry; pores evident; pH 7.5; gradual change to: | |
B23 | 90+ cm | Brown (7.5YR4/2) with reddish brown (5YR5/4); fine sandy clay loam; weak coarse prismatic structure; very firm consistence slightly moist; dark stains and pores evident; pH 8.3. |
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Strongly Acid | Moderate | Non-sodic | None |
Subsoil (B21 horizon) | Moderately Acid | Moderate | Non-sodic | None |
Deeper subsoil (at 90 cm) | Moderately Alkaline | High-Very High | Sodic | - |
The surface and upper subsoil is moderately acid. The deeper subsoil is strongly alkaline. | The surface and upper subsoil is non-sodic. The subsoil becomes sodic below 70 cm depth. | ||
The surface salinity rating is low to moderate. The upper subsoil rating is low becoming moderate with depth. | The clay content gradually decreases with depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | ESP % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-30 | 5.4 | 4.9 | 0.45 | 16 | 4.8 | 2.2 | 0.2 | |
B21 | 30-55 | 6 | 5.4 | 0.35 | 14 | 5 | 1.7 | 0.2 | |
B22 | 55-90 | 7.5 | 7 | 0.45 | 5.4 | 2.1 | 1.7 | 0.3 | |
B23 | 90+ | 8.3 | 8 | 0.81 | 4.7 | 4.6 | 0.3 | 1.6 |
Horizon | Horizon Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | Wilting Point 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 | 0-30 | <10 | 16.6 | 4 | 21 | 36 | 30 | ||
B21 | 30-55 | <10 | 8.1 | 14.1 | 2 | 22 | 37 | 33 | |
B22 | 55-90 | 7.7 | 7.7 | 11 | 41 | 28 | |||
B23 | 90+ | 10.7 | 1 | 41 | 33 | 25 |