Location: Clydebank. | Australian Soil Classification: Sodic, Eutrophic, Red DERMOSOL |
Geology: Quaternary prior stream deposits associated with Avon River. | General Landscape Description: Gently undulating plain (higher "red bank" country). |
Mapping Unit: Clydebank | Site Description: Dairy grazing paddock. |
Site GP72 Landscape |
Surface Soil | Site GP72 Soil Profile | ||
A11 | 0-15 cm | Dark brown (10YR3/3); light fine sandy loam; hardsetting surface condition; weakly structured; very firm consistence dry; macropores present; pH 5.1: | |
A12 | 15-30 cm | Dark brown (7.5YR3/4); light fine sandy clay loam; weak to moderate medium polyhedral structure; very firm consistence dry; macropores present; pH 5.4: | |
Subsoil | |||
B1 | 30-50 cm | Yellowish red (5YR4/6); fine sandy clay loam (becoming light clay with depth); moderate coarse blocky structure; strong consistence dry; many pores present; pH 6.9; clear change to: | |
B21 | 50-90 cm | Yellowish red (5YR4/6); light medium clay; strong coarse prismatic, parting to strong coarse to medium blocky structure; strong consistence dry; contains few (5%) manganese stains; pH 7.5: | |
B22 | 90-120 cm | Light brown (7.5YR6/3) with strong brown (7.5YR5/8) and light reddish brown (5YR6/3) mottles; medium clay; strong coarse prismatic, parting to strong coarse blocky structure; strong consistence dry; gypsum present; pH 8.6 | |
B23 | 120+ cm | Pinkish grey (7.5YR6/2) with strong brown (7.5YR5/8) mottles; light clay; strong coarse prismatic structure; strong consistence dry; pH 8.8. |
pH | Salinity Rating | |||
Surface (A1 Horizon) | Strongly Acid | Moderate | non-sodic | __ |
Subsoil (B21 Horizon) | Slightly Alkaline | Very Low | Sodic | Slight1 |
Deeper Subsoil (at 110cm) | Strongly Alkaline | Low | Strongly Sodic | Complete |
The soil profile becomes increasingly alkaline with depth. | The upper subsoil is sodic; becoming strongly sodic at 80 cm depth. | ||
The surface salinity rating is moderate to high. The subsoil rating is low. | The clay content increases gradually with depth down the soil profile. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A11 | 0-15 | 5.1 | 4.7 | 0.56 | 4 | 1.7 | 1.3 | 0.58 | |
A12 | 15-30 | 5.4 | 4.6 | 0.15 | 2.8 | 0.98 | 0.8 | 0.27 | |
B1 | 30-50 | 6.9 | 5.9 | 0.08 | 3.5 | 2.7 | 0.22 | 0.58 | |
B21 | 50-90 | 7.5 | 6.5 | 0.16 | 51 | 6.8 | 0.33 | 1.7 | |
B22 | 90-120 | 8.6 | 7.4 | 0.23 | 4.6 | 6.9 | 0.2 | 3.2 | |
B23 | 120+ | 8.8 | 7.7 | 0.35 | <0.1 | 4.4 | 0.2 | 3.1 |
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 | 0-15 | <10 | 8.5 | 8 | 42 | 26 | 20 | ||
A12 | 15-30 | <10 | 6.3 | 7.9 | 8 | 44 | 26 | 20 | |
B1 | 30-50 | 10.1 | 6 | 32 | 31 | 31 | |||
B21 | 50-90 | 17.1 | 3 | 15 | 31 | 49 | |||
B22 | 90-120 | ||||||||
B23 | 120+ |