SW27
Location: Bostock Creek.
Australian Soil Classification: Vertic (& Ferric), Subnatric, Grey SODOSOL.
Map Unit: Map Unit 113 (Maher and Martin, 1987).
General Landscape Description: Grazing paddock (dairy).
Site Description: Lower slope within gently undulating hills.
Geology: Quaternary - Newer volcanics (scoria).
 SW27 Landscape |
Soil Profile Morphology:
Surface Soil
| A11 | 0-15 cm | Black (10YR2/1); fine sandy clay loam; weak to moderate medium polyhedral, parting to moderate fine polyhedral structure; firm to very firm consistence dry; weak-firm consistence (moist); pH 6.1; gradual change to: |  SW27 Profile |
| A12 | 15-40 cm | Very dark grey (10YR3/1); fine sandy clay loam; moderate medium polyhedral, parting to moderate fine polyhedral structure; weak-firm consistence moist; pH 5.8; abrupt change to: | |
| A2 | 40-50 cm | Brown (10YR5/3), conspicuously bleached (7.5YR7/2d); fine sandy clay loam; apedal; contains very many (> 50%) ferruginous nodules (2-6 mm in size); pH 6.5; sharp change to: | |
| Subsoil | |||
| B21 | 50-70 cm | Very dark greyish brown (10YR3/2) becoming dark greyish brown (2.5Y4/2) with depth, with yellowish brown (10YR5/6) mottles; heavy clay; moderate very coarse prismatic, parting to moderate coarse to medium polyhedral structure; strong consistence dry; contains some dark stains; pH 6.5; gradual change to: | |
| B22 | 70-100 cm | Greyish brown (2.5Y5/2) with many yellowish brown (10YR5/8) mottles; heavy clay; strong very coarse prismatic, parting to coarse prismatic and very coarse blocky structure; strong consistence dry; many slickensides present; pH 7.0; abrupt change to: | |
| C | 100+ cm | Weathered ash. | |
Key Profile Features:
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
 | pH | Salinity Rating | ||
Surface (A1 horizon) | Slightly Acid | Low-Medium | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Sodic | None |
Deeper subsoil (at 70-100 cm) | Neutral | Very Low | Sodic | None |
 |
| The surface soil and upper subsoil is slightly acid. The deeper subsoil is neutral. | | The salinity rating in the surface soil is low to moderate. The subsoil is very low. | | The surface is non-sodic. The subsoil is sodic. | | The clay content increases dramatically at the subsoil boundary (50 cm depth). |
Horizon | Horizon Depth (cm) | pH (water) | pH CaCl2 | EC (dS/m) | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A11 | 0-15 | 6.1 | 5.7 | 0.29 | 0.02 | 14 | 2.3 | 0.6 | 0.1 |
A12 | 15-40 | 5.8 | 5 | 0.09 | | 6.7 | 2.1 | 0.1 | 0.1 |
A2 | 40-50 | 6.5 | 5.6 | 0.08 | | 4.5 | 2.2 | <0.1 | 0.2 |
B21 | 50-70 | 6.5 | 5.8 | 0.18 | | 5.8 | 9.6 | 0.2 | 1.4 |
B22 | 70-100 | 7 | 6.1 | 0.18 | | 4.7 | 11 | 0.2 | 2.4 |
C | 100+ | | | | | | | | |
Horizon | Horizon Depth (cm) | Oxidisable Organic Carbon % | Total Nitrogen % | 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 | 5.5 | 0.47 | 39 | 18 | 6 | 39 | 22 | 19 |
A12 | 15-40 | 3.0 | 0.19 | 34 | 11 | 5 | 46 | 22 | 20 |
A2 | 40-50 | | | 26 | 11 | 29 | 33 | 15 | 19 |
B21 | 50-70 | | | 56 | 35 | 4 | 12 | 5 | 73 |
B22 | 70-100 | | | 56 | 32 | 3 | 14 | 8 | 72 |
C | 100+ | | | | | | | | |
Profile Described By: Mark Imhof and Austin Brown (May 1988).
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