TOPCROP5b
Location: Lubeck
Australian Soil Classification: Endocalcareous-Endohypersodic, Epipedal, Yellow VERTOSOL
General Landscape Description: Level plain.
Site Description: Cropping paddock (field peas 2002, barley 2001)
Geology: Quaternary (Woorinen Formation) deposits.
 TOPCROP5 Landscape |
Soil Profile Morphology:
Surface Soil
| Ap | 0-5 cm | Dark greyish brown (10YR4/2); light medium clay; moderate medium polyhedral, parting to moderate fine polyhedral structure; strong consistence dry; pH 6.4: | No profile image exists for this profile. However see TOPCROP5a for a similar grey VERTOLSOL recorded in the same pit. |
| Subsoil |  | | |
| B21 | 5-20 cm | Brown (10YR5/3) with faint brownish yellow (10YR6/6) mottles; medium clay; moderate to strong coarse blocky structure; slickensides present; strong consistence dry; slightly calcareous; pH 7.4: | |
| B22 | 20-60 cm | Light yellowish brown (2.5Y6/4); heavy clay; moderate very coarse blocky structure as well some lenticular structure; strong consistence dry; very few (2%) soft and hard (1%) calcareous nodules; slightly calcareous; pH 8.6: | |
| B23 | 60-100 cm | Reddish yellow (7.5YR6/6&6/8) with light yellowish brown (10YR6/4) mottles; medium heavy clay; moderate coarse blocky structure; strong consistence dry; very few (2%) soft calcareous segregations and manganese flecks; moderately calcareous; pH 9.3. | |
| | NOTE: Large cracks throughout the profile. | |
Key Profile Features:
- Clay texture throughout the profile.
Soil Profile Characteristics:
| - | pH | Salinity | ||
Surface (A1 horizon) | Slightly Acid | Low | Non-Sodic | None1 |
Subsoil (B21 horizon) | Slightly Alkaline | Low | Sodic | None2 |
Deeper Subsoil (at 1 metre) | Very Strongly Alkaline | Low-Moderate | Strongly Sodic | Slight-Moderate |
| The surface soil is slightly acid. The upper subsoil is slightly alkaline becoming very strongly alkaline with depth. | | The salinity rating is low in the surface soil becoming low to moderate in the deeper subsoil. | | The surface is non-sodic. The subsoil is sodic becoming strongly sodic with depth. | | The boron levels increase in the subsoil. | | The clay content is quite high throughout. |
Chemical and Physical Analysis:
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | Sodium Chloride % | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
Ap | 0-5 | 6.4 | 6.1 | 0.19 | | 12 | 5.5 | 1.9 | 0.37 |
B21 | 5-20 | 7.4 | 6.9 | 0.26 | <0.01 | 13 | 12 | 1.0 | 0.9 |
B22 | 20-60 | 8.6 | 8.0 | 0.41 | <0.01 | 10 | 15 | 1.1 | 2.6 |
B23 | 60-100 | 9.3 | 8.6 | 0.49 | 0.01 | 4.6 | 12 | 0.8 | 4.5 |
Horizon | Horizon Depth (cm) | Boron mg/kg | Total Nitrogen % | Oxidisable Organic Carbon % | 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) % |
Ap | 0-5 | 1.8 | 0.18 | 2.2 | 30.8 | 15.7 | 4 | 37 | 13 | 39 |
B21 | 5-20 | 2.7 | | | 38.3 | 20.3 | 2 | 26 | 9 | 59 |
B22 | 20-60 | 4.4 | | | 40.8 | 20.8 | 2 | 26 | 13 | 57 |
B23 | 60-100 | | | | 37.2 | 18.8 | | | | |
Profile Described By: Mark Imhof and Brooke Thompson (December 2007).
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