SW73
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| SW73 |  Bleached-mottled, Mesotrophic, Brown CHROMOSOL | |
| Hills south of Colac, between Christies and Colac/Lavers Hill Roads | |||
| Undulating low hills | |||
| Paleogene sediments: Dilwyn or Eastern View Formation | |||
| Waxing upper slope | |||
| 5% | |||
| East | |||
Horizon | Depth (cm) | Description | ||
A1 | 0-15 | Dark brown (10YR3/3 moist), fine sandy loam; weakly pedal; weak consistence (dry); pH 5.4; boundary to: | ||
A2 | 15-40 | Dark greyish brown (10YR4/2 moist), pale brown (10YR6/3 dry); conspicuously bleached; sandy loam; apedal, massive; very firm consistence (dry); minor (<5%), coarse (5-15 mm) irregular rounded ferruginised sandstone gravel; pH 5.6; abrupt to clear and wavy boundary to: | ||
B21t | 40-70 | Dark yellowish brown (10YR4/5 dry) with prominent medium (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 boundary to: | ||
B22t | 70/80–100/110 | Dark yellowish brown (10YR4/5 moist and dry) with prominent medium (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 boundary to: | ||
B/C | 100/110 + | 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. | ||
| Management considerations | ||||
| Hard setting (dry) and ‘spewy’ (wet) topsoils are characteristic of soils in the district. Soils in this landscape become very waterlogged on the slopes. The swelling properties of the subsoil clay restricts downward drainage and encourages perching of water in the A2 and lateral flow downslope. Topsoil is moderately acidic and would benefit from lime. | ||||
Analytical data
Site SW73 | Sample depth | pH | EC | NaCl | Ex Ca | Ex Mg | Ex K | Ex Na | Ex Al | Ex acidity | FC (-10kPa) | PWP (-150kPa) | KS | FS | Z | C | |
Horizon | cm | H2O | CaCl2 | dS/m | % | cmolc/kg | cmolc/kg | cmolc/kg | cmolc/kg | mg/kg | cmolc/kg | % | % | % | % | % | % |
A1 | 0-10 | 5.4 | 4.8 | 0.17 | N/R | 5.2 | 1.1 | 0.49 | 0.32 | 17 | 15.0 | 26.5 | 10.2 | 23.8 | 38.4 | 12.0 | 13.0 |
A2 | 20-40 | 5.6 | 4.9 | 0.1 | N/R | 0.62 | 0.91 | 0.07 | 0.1 | <10 | 4.8 | 14.6 | 4.2.0 | 24.8 | 45.9 | 22.0 | 6.0 |
B21 | 50-65 | 5.8 | 5.2 | 0.11 | N/R | 1.9 | 7.4 | 0.1 | 0.53 | <10 | 9.4 | 42.4 | 27.6 | 9.0 | 10.5 | 7.5 | 73.5 |
B22 | 80-95 | 6.0 | 5.2 | 0.06 | N/R | 1.5 | 6.4 | 0.07 | 0.4 | <10 | 7.9 | 36.0 | 23.6 | 16.3 | 12.2 | 6.5 | 63.0 |
B/C | 105+ | 6.0 | 5.2 | <0.05 | N/R | N/R | N/R | N/R | N/R | N/R | N/R | N/R | N/R | N/R | N/R | N/R | N/R |
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