SW73
| Location: Tullah | Australian Soil Classification: Bleached-Mottled, Mesotrophic, Brown CHROMOSOL |
| General Landscape Description: Undulating low hills | Site Description: Waxing upper slope (10%), eastern aspect |
| Geology: Ambiguous: Either Dilwyn (Colac 1:250 000) or Eastern View Formation (Colac 1:50 000) | |
 SW73 Landscape |
Soil Profile Morphology:
Surface Soil
| A1 | 0-? cm | Dark brown (10YR3/3 moist), fine sandy loam; weakly pedal; weak consistence (dry); pH 5.4: |  SW73 Profile - Note: Surface (A1) horizon has been stripped from the soil profile |
| A2 | ?-40 cm | Dark greyish brown (10YR4/2 moist), pale brown (10YR6/3 dry); conspicuously bleached; sandy loam; apedal, massive; very firm consistence (dry); (minor <5%), fine (5-15 mm), irregular rounded ferruginised sandstone gravel; pH 5.6; abrupt to clear and wavy change to: | |
| Subsoil |  | | |
| B21t | 40-70 cm | Dark yellowish brown (10YR4/5 dry); with prominent (5-15 mm), red (10R4/8 moist) to dark red (2.5YR4/8 moist) to yellowish brown (10YR6/8 moist) mottles in ped interiors, reddest in ped centres; medium clay; coarse prismatic structure; pH 5.8; strong consistence (dry); gradual change to: | |
| B22t | 70/80-100/110 cm | Dark yellowish brown (10YR4/5 moist and dry) with prominent (5-15 mm), red (10R4/8 moist) to dark red (2.5YR4/8 moist) to yellowish brown (10YR6/8 moist) mottles in ped interiors (reddest away from ped face); medium clay; white (2.5Y8/1) clay adjacent to cutans; pH 6; gradual change to: | |
| B/C | 100/110 cm+ | Weak red to dusky red (10R5/3-3/2); ferruginised sandstone with yellowish and white edges; clay infill and weathering in joints; pH 6.0. |
Key Profile Features:
- Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Soil Profile Characteristics:
| pH | Salinity Rating | Sodicity | Dispersion |
Surface (A1 horizon) | Strongly Acid | | Non-Sodic | None |
Subsoil (B21 horizon) | Moderately Acid | Very Low | Non-Sodic | None |
Deeper subsoil (at 100+ cm) | Moderately Acid | Very Low | Non-Sodic | None |
 |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-?? | 5.4 | 4.8 | 0.17 | | 5.2 | 1.1 | 0.49 | 0.32 |
A2 | ??-40 | 5.6 | 4.9 | 0.1 | | 0.62 | 0.91 | 0.07 | 0.1 |
B21 | 40-70 | 5.8 | 5.2 | 0.11 | | 1.9 | 7.4 | 0.1 | 0.53 |
B22 | 70-105 | 6 | 5.2 | 0.06 | | 1.5 | 6.4 | 0.07 | 0.4 |
BC | 105+ | 6 | 5.2 | <0.05 | | | | | |
Horizon | Horizon Depth (cm) | Ex Al mg/kg | Ex Ac meq/100g | Field 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-?? | 17 | 15 | 26.5 | 10.2 | 23.8 | 38.4 | 12 | 13 |
A2 | ??-40 | <10 | 4.8 | 14.6 | 4.2 | 24.8 | 45.9 | 22 | 6 |
B21 | 40-70 | <10 | 9.4 | 42.4 | 27.6 | 9 | 10.5 | 7.5 | 73.5 |
B22 | 70-105 | <10 | 7.9 | 36 | 23.6 | 16.3 | 12.2 | 6.5 | 63 |
BC | 105+ | | | | | | | | |
Management Considerations:
Notes
- Similar pattern on both sides of unnamed creek. Soils increasingly vertic downslope, gleying increases, A2 thickens. Colluvial derived from and lying on Tad or Tae2. Becoming quite pallid in places below colluvial mass. Fragments are angular, occasional weakly rounded and up to 200 mm diameter at largest, generally ~100 mm.
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