MP40
| Location: Nullawil. | Australian Soil Classification: Epihypersodic, Pedal, Calcic, CALCAROSOL (clay loam surface). |
| General Landscape Description: Level plain with gilgai micro-relief (mallee vegetation). | |
| Site Description: Wheat stubble paddock. | Geology: Quaternary alluvial and aeolian sediments. |
 Site MP40 Landscape |
Soil Profile Morphology:
Surface Soil
| Ap | 0-10 cm | Dark brown (10YR3/3); heavy sandy clay loam; weak-moderate medium blocky, parting to fine to very fine granular structure; soft surface condition; very weak consistence (dry); slightly calcareous; pH 7.9: |  Site MP40 Profile |
| A12 | 10-15 cm | Dark brown (10YR3/3); sandy clay; very firm consistence (dry); slightly calcareous; pH 8.4: | |
| Subsoil | |||
| B21k | 15-30 cm | Strong brown (7.5YR5/6); light medium clay; moderate-strong coarse to medium prismatic, parting to strong coarse to medium blocky structure; strong consistence (dry); soft calcareous nodules common (15%); macropores present; organic staining along ped faces; very highly calcareous; pH 9.0: | |
| B22k | 30-70 cm | Pinkish brown (7.5YR7/4) with reddish yellow (7.5YR6/6) mottles; light medium clay; moderate coarse to medium polyhedral structure; very firm consistence (dry); many soft calcareous nodules (20%); most roots to 40 cm; pH 9.8: | |
| B23k | 70-100 cm | Yellow (10YR7/6) with yellowish red (5YR5/8) mottles; medium clay; strong consistence (dry); soft calcareous nodules common; pH 9.8: | |
| B24 | 100-130 cm | Yellow (10YR7/6) with few (5%) reddish yellow (5YR6/8) mottles; medium heavy clay; manganese flecks (5%); slightly calcareous; pH 9.2. | |
Key Profile Features
- Gradual increase in texture (clay content) with depth down the soil profile.
- Fine-earth carbonates common in upper subsoil horizons.
 | pH | Salinity Rating | ||
Surface (A1 horizon) | Slightly Alkaline | Low | Non-Sodic | None1 |
Subsoil (B21 horizon) | Strongly Alkaline | Low | Sodic | None |
Deeper subsoil (at 100-130 cm) | Very Strongly Alkaline | Very High | Strongly Sodic | Moderate |
 | | ||
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCI % | Exchangeable Cations | Boron (CaCl2) mg/kg | Field Capacity pF 2.5 | Wilting Point pF 4.2 | Coarse Sand (0.2 - 2 mm) | Fine Sand (0.02 -0.2 mm) | Silt (0.002 -0.02 mm) | Clay (<0.002 mm) | |||
Ca | Mg | K | Na | |||||||||||||
meq/100g | ||||||||||||||||
Ap | 0-10 | 7.9 | 7.4 | 0.26 | 0.02 | 15 | 5.0 | 2.4 | 5.0 | 2.7 | 23 | 12 | 31 | 28 | 12 | 25 |
A2 | 10-15 | 8.4 | 7.7 | 0.20 | | 14 | 6.6 | 1.2 | 1.1 | 3.7 | 25 | 13 | 34 | 25 | 10 | 27 |
B21k | 15-30 | 9.0 | 8.3 | 0.31 | 0.02 | 15 | 11 | 1.1 | 2.0 | 4.5 | 33 | 19 | 29 | 17 | 14 | 32 |
B22k | 30-70 | 9.8 | 9.2 | 0.82 | | 3.6 | 14 | 1.3 | 7.1 | 23 | 34 | 22 | 18 | 16 | 10 | 34 |
B23k | 70-100 | 9.8 | 9.6 | 1.4 | 0.15 | 2.6 | 14 | 1.8 | 11 | | 45 | 25 | | | | |
B24 | 100-130 | 9.2 | 9.1 | 1.4 | 0.20 | 2.3 | 16 | 1.9 | 13 | | | | | | | |
Notes: Most roots observed to 40 cm depth.
Profile Described By: Mark Imhof, April 2004.
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