SW31
Location: Gerangamete
Australian Soil Classification: Bleached-Mottled, Mesotrophic, Brown KUROSOL
Map Unit: Barongarook Land System (Pitt, 1981).
General Landscape Description: Crest of gently undulating rises.
Site Description: Grazing paddock (dairy).
Native Vegetation: Messmate (Eucalyptus obliqua) occurs on higher ground and Ribbon Gum (E. viminalis) and Swamp Gum (E. ovata) occurs on lower ground.
Geology: Tertiary - Moorabool Viaduct Formation.
 SW31 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-15 cm | Greyish brown (10YR3/2); light fine sandy clay loam; weak coarse blocky structure; very firm consistence moist; pH 4.8: |  SW31 Profile |
| A21 | 15-30 cm | Dark brown (7.5YR3/2); very fine sandy clay loam; weak coarse blocky structure; firm to very firm consistence moist; pH 4.8: | |
| A22 | 30-40 cm | Greyish brown (10YR5/2), conspicuously bleached; very fine sandy clay loam; very firm consistence moist; pH 4.7: | |
| A23 | 40-50 cm | Greyish brown (10YR5/2) with brownish yellow (10YR6/6) mottles, conspicuously bleached; heavy very fine sandy clay loam; very firm consistence moist; pH 4.7; abrupt and wavy change to: | |
| Subsoil |  | | |
| B21 | 50-70 cm | Brown (10YR5/3) with yellowish brown (10YR5/6) mottles; light medium clay; moderate medium prismatic, parting to strong coarse blocky structure; strong consistence moist; pH 4.7: | |
| B22 | 70+ cm | Greyish brown (10YR5/2) with yellowish brown (10YR5/6) mottles; medium clay; moderate coarse prismatic, parting to moderate coarse blocky structure (with strong fine blocky structure in patches); strong consistence moist; pH 4.8. |
Key Profile Features:
- Strong texture contrast between (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | ||
Surface (A1 horizon) | Very Strongly Acid | Moderate | Non-Sodic | None |
Subsoil (B21 horizon) | Very Strongly Acid | Very Low - Low | Non-Sodic | None |
Deeper Subsoil (at 70+ cm) | Very Strongly Acid | Very Low - Low | Non-Sodic | None |
 The whole profile is very strongly acid. |  The surface has a moderate salinity rating. The subsoil is very low to low. |  The clay content increases abruptly at 50 cm depth. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC (dS/m) | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-15 | 4.8 | 4.3 | 0.26 | 0.02 | 5.1 | 0.4 | 0.6 | 0.05 |
A21 | 15-30 | 4.8 | 4.4 | 0.38 | 0.04 | 5.9 | 0.6 | 0.3 | 0.05 |
A22 | 30-40 | 4.7 | 4.2 | 0.24 | | 1.2 | 0.2 | 0.3 | 0.05 |
A23 | 40-50 | 4.7 | 4.1 | 0.14 | | 0.8 | 0.7 | 0.3 | 0.05 |
B21 | 50-70 | 4.7 | 4.1 | 0.19 | | 1.5 | 2.7 | 0.3 | 0.05 |
B22 | 70+ | 4.8 | 4.1 | 0.18 | | 0.8 | 3.1 | 0.1 | 0.3 |
Horizon | Horizon Depth (cm) | Acidity meq/100g | 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) |
A1 | 0-15 | | 5.3 | 0.36 | 36 | 11.6 | 5 | 37 | 30 | 15 |
A21 | 15-30 | | 5.1 | 0.31 | 35.9 | 11.2 | 4 | 38 | 30 | 15 |
A22 | 30-40 | | | | 31.1 | 7.7 | 3 | 42 | 35 | 18 |
A23 | 40-50 | | | | 25.3 | 9.2 | 3 | 40 | 33 | 24 |
B21 | 50-70 | 12 | | | 34.7 | 19.3 | 1 | 28 | 24 | 47 |
B22 | 70+ | | | | 43.3 | 24.8 | 1 | 19 | 20 | 59 |
Profile Described By: Mark Imhof and Austin Brown (June 1998).
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