Location: Boisdale. | Australian Soil Classification: Melanic, Eutrophic, Black DERMOSOL. |
Geology: Holocene floodplain deposits. | General Landscape Description: Floodplain of Avon River. |
Mapping Unit: Clydebank: Thomson. | Site Description: Dairy grazing paddock. |
Site GP76 Landscape |
A1 | 0-30 cm | Very dark brown (10YR2/2); fine sandy clay loam; moderate coarse blocky, parting to strong fine polyhedral structure; strong consistence dry; pH 5.9; gradual change to: | Site GP76 Profile |
Subsoil | |||
B21 | 30-50 cm | Black (10YR2/1); fine sandy clay loam; weak coarse prismatic, parting to strong fine polyhedral structure; pH 6.3: | |
B22 | 50-90 cm | Dark brown (7.5YR3/2); fine sandy clay loam; moderate coarse prismatic structure; pores evident; pH 6.8: | |
B23 | 90+ cm | Brown (7.5YR4/2); fine sandy clay loam; weakly structured; pH 7.1. |
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Moderately Acid | Low | Non-Sodic | - |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Non-Sodic | None1 |
Deeper Subsoil (at 90 cm) | Slightly Alkaline | Very Low | Non-Sodic | - |
The surface is moderately acid. The upper subsoil is slightly acid becoming slightly alkaline at 90 cm. | The profile is non-sodic throughout. | ||
The surface salinity rating is low. The subsoil rating is very low throughout. | The clay content remains constant throughout the profile. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | ESP % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-30 | 5.9 | 5.2 | 0.12 | 10 | 2.9 | 0.94 | 0.22 | |
B21 | 30-50 | 6.3 | 5.3 | <0.05 | 10 | 2.8 | 0.31 | 0.2 | |
B22 | 50-90 | 6.8 | 5.7 | <0.05 | 10 | 3.2 | 0.17 | 0.21 | |
B23 | 90+ | 7.1 | 6 | <0.05 | 7.3 | 4.3 | 0.08 | 0.24 |
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 | 14.4 | 4 | 44 | 24 | 21 | |||
B21 | 30-50 | <10 | 8.6 | 10.3 | 2 | 51 | 23 | 20 | |
B22 | 50-90 | 9.5 | 2 | 52 | 22 | 19 | |||
B23 | 90+ |