Location: Tulloh
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:
A1 | 0-20* 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 | 20*-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. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Strongly Acid | Low - Moderate | 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 |
The surface soil is strongly acid. The subsoil is moderately acid. | Salinity rating is low to moderate in the surface becoming very low in the subsoil. |
| The clay content increases markedly at the A/B boundary. |
Horizon | Sample Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | Nitrogen % | Organic Carbon % | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||||
meq/100g | ||||||||||
A1 | 0-20* | 5.4 | 4.8 | 0.17 | 0.35 | 4.3 | 5.2 | 1.1 | 0.49 | 0.32 |
A2 | 20*-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 | Sample Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | 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 | 0-20* | 17 | 15 | 26.5 | 10.2 | 24 | 38 | 12 | 13 |
A2 | 20*-40 | <10 | 4.8 | 14.6 | 4.2 | 25 | 46 | 22 | 6 |
B21 | 40-70 | <10 | 9.4 | 42.4 | 27.6 | 9 | 11 | 8 | 74 |
B22 | 70-105 | <10 | 7.9 | 36 | 23.6 | 16 | 12 | 7 | 63 |
BC | 105+ |