OTR418
Australian Soil Classification: Humose-Acidic, Mesotrophic, Brown DERMOSOL
Northcote Factual Key: Gn3.21
General Landscape Description: Mountains, Hills
Site Description: Ridge Slope Aspect: South
Native Vegetation: E. regnans, A. melanoxylon, Pomaderris spp.
Geology: Kl: Cretaceous Fluvial Sediments; Felspathic Sandstone, Siltstone, Mudstone (Eumeralla Formation).
Soil Profile Morphology:
Surface Soil
| A11 | 0-8 cm | Very dark brown (10YR2/2); loam; strong very fine crumb structure; pH 5.0; abrupt change to: |  |
| A12 | 8-30 cm | Dark brown (7.5YR3/2); clay loam; moderate fine subangular blocky structure; pH 4.8; gradual change to: | |
| Subsoil | | ||
| B21 | 30-75 cm | Dark brown (10YR3/4); medium clay; moderate medium subangular blocky structure; weak to firm consistence; pH 5.0; diffuse change to: | |
| B22 | 75-140 cm | Yellowish brown (10YR5/6); light clay; weak subangular blocky structure; weak to firm consistence; a few sandstone gravels; pH 4.9; diffuse change to: | |
| C | 140 + cm | Weathered sandstone. | |
Soil Profile Characteristics:
| Salinity Rating | ||
Surface (A1 horizon) | Very Strongly Acid | Medium | Non-Sodic |
Subsoil (B21 horizon) | Strongly Acid | Low | Non-Sodic |
Deeper Subsoil (at 90 cm) | Very Strongly Acid | Medium | Non-Sodic |
|
| The surface and deeper subsoil is very strongly acid. The B21 horizon is strongly acid. | | The salinity rating is medium except for the B21 horizon where it is low. | | This profile is non-sodic. | | The clay content is moderate and is at its highest in the B21 horizon. |
Horizon | Horizon Depth (cm) | pH (water) | EC dS/m | Cl % | Organic Carbon % | Total N % | P ppm | K ppm | Free Fe % | Exchangeable Cations | Total Bases cmolc/kg | Ex Ac cmolc/kg | CEC cmolc/kg | |||
Ca | Mg | K | Na | |||||||||||||
cmolc/kg | ||||||||||||||||
A11 | 0 - 8 | 4.8 | 0.330 | 0.026 | 8.1 | 0.66 | 18 | 320 | 3.5 | 4.3 | 5.4 | 0.9 | 0.4 | 11.0 | 15.3 | 26.3 |
A12 | 8 - 15 | 5.0 | 0.270 | 0.028 | 5.3 | 0.46 | 10 | 260 | 3.7 | 3.4 | 4.0 | 0.7 | 0.3 | 8.4 | 16.2 | 24.5 |
| 15 - 30 | 5.1 | 0.170 | 0.017 | 3.1 | 0.26 | | | 5.3 | | | | | | | |
B21 | 30 - 45 | 5.0 | 0.200 | 0.025 | 1.9 | 0.15 | | 140 | 5.8 | 1.5 | 1.6 | 0.4 | 0.3 | 3.8 | 13.3 | 17.0 |
| 45 - 60 | 4.9 | 0.140 | 0.018 | 1.2 | 0.097 | | | 6.0 | | | | | | | |
| 60-75 | 4.7 | 0.150 | 0.022 | 0.8 | 0.067 | | | 5.5 | | | | | | | |
B22 | 75-90 | 4.6 | 0.130 | 0.020 | 0.5 | 0.045 | | 100 | 4.8 | 0.6 | 0.8 | 0.3 | 0.3 | 2.0 | 11.1 | 13.0 |
| 90 - 120 | 4.6 | 0.190 | 0.030 | 0.5 | 0.043 | | 160 | 3.9 | 0.7 | 0.9 | 0.4 | 0.2 | 2.2 | 11.1 | 13.0 |
Horizon | Horizon Depth (cm) | Gravel % | 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 - 8 | 2 | 6 | 30 | 23 | 30 |
A12 | 8 - 15 | | 5 | 32 | 27 | 30 |
| 15 - 30 | | 3 | 27 | 28 | 36 |
B21 | 30 - 45 | 3 | 3 | 24 | 14 | 53 |
| 45-60 | 6 | 6 | 26 | 15 | 51 |
| 60-75 | 6 | 6 | 30 | 14 | 47 |
B22 | 75-90 | 5 | 5 | 41 | 15 | 36 |
| 90 - 120 | 4 | 4 | 45 | 15 | 33 |
Profile Described By: Frank Gibbons, 12th January 1966.
Profile Described By:
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