YP4
Location: Wallup
Australian Soil Classification: Epicalcareous-Endohypersodic, Self-Mulching, Grey VERTOSOL
General Landscape Description: Clay plain.
Site Description: Cropping paddock.
Geology: Quaternary alluvial and aeolian deposits.
| YP4 Landscape |
Soil Profile Morphology:
Surface Soil
| Ap1 | 0-4 cm | Grey (10YR5/1); self-mulching surface condition; light medium clay; very highly calcareous; pH 8.1; clear change to: |  YP4 Profile |
| Ap2 | 4-18 cm | Grey (2.5Y5/1); medium clay; moderate coarse blocky structure; firm to strong consistence dry; highly calcareous; pH 8.3; clear change to: | |
| Subsoil |  | ||
| B21 | 18-45 cm | Dark grey (10YR4/1); medium heavy clay; moderate to coarse prismatic, parting to strong coarse angular blocky, parting to strong fine sub-angular blocky structure (in patches); very highly calcareous; pH 8.9; clear change to: | |
| B22 | 45-80 cm | Dark grey (10YR4/1); medium heavy clay; moderate coarse prismatic, parting to strong coarse sub-angular blocky structure; few (5%) fine-earth carbonates; very highly calcareous; gradual change to; pH 9: | |
| B23 | 80-120 cm | Light yellowish brown (10YR6/4); light medium clay; strong very coarse prismatic structure; very highly calcareous; pH 9. | |
| | | |
| - | pH | Salinity | ||
Surface (A1 horizon) | Moderately Alkaline | Low | Non-Sodic | Strong |
Subsoil (B21 horizon) | Moderately Alkaline | Low | Sodic | None 1 |
Deeper Subsoil (at 80-100 cm) | Strongly Alkaline | High | Extremely Sodic (40%) | Slight 2 |
| The surface is moderately alkaline. The upper subsoil is moderately alkaline, becoming strongly alkaline with depth. | | The salinity rating is low in the surface and upper subsoil, becoming high in the deeper subsoil. | | The surface is non-sodic. The upper subsoil is sodic becoming extremely sodic with depth. | |
| | | Boron is relatively low in the upper soil profile, but becomes high below 50 cm depth. | |
Chemical and Physical Analysis:
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | Sodium Chloride % | Exchangeable Cations | Organic Carbon % | Total Nitrogen % | Boron mg/kg | 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) | |||
Ca | Mg | K | Na | |||||||||||||||
meq/100g | ||||||||||||||||||
Ap1 | 0-4 | 8.1 | 7.6 | 0.28 | | 29 | 5.6 | 2.3 | 0.37 | 1 | 0.096 | 1.7 | 37.8 | 19.2 | 15 | 18 | 15 | 42 |
Ap2 | 4-18 | 8.3 | 7.7 | 0.17 | | 36 | 5.2 | 1.7 | 0.42 | 0.96 | 0.094 | 1.4 | 38.4 | 19.4 | 17 | 18 | 13 | 44 |
B21 | 18-45 | 8.9 | 7.9 | 0.19 | | 6.5 | 5 | 0.18 | 0.86 | 0.68 | 0.061 | 2.3 | 40 | 21.4 | 20 | 20 | 13 | 44 |
B22 | 45-80 | 9 | 8.4 | 1.1 | 0.14 | 14 | 13 | 1.4 | 13 | | | 16 | 51 | 24.3 | 14 | 14 | 13 | 51 |
B23 | 80-100 | 9 | 8.5 | 1.6 | 0.22 | 11 | 11 | 1.7 | 16 | | | 24 | 49.4 | 23.7 | 12 | 14 | 11 | 48 |
Profile Described By: Mark Imhof (October 2008).
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