Location: Gnarwarre.
Australian Soil Classification: Endocalcareous, Self-Mulching, Black VERTOSOL
General Landscape Description: Low rise on an undulating plain.
Site Description: Southern edge of Gnarwarre Farming Systems trial site raised bed cropping.
Geology: Quaternary Basalt - Newer Volcanics
Map Unit: Gnarwarre A soil (Adcock, 1998).
SFS2 Landscape. Also shows the Map Units within the Gnarwarre SFS trial site.
Soil Profile Morphology:
Surface Soil
Ap | 0-20cm | Black (10YR2/1); self-mulching and cracking surface condition; light medium clay; strongly pedal; pH 6.0; clear change to: | SFS2 Profile. |
Subsoil | |||
B21g | 20-50/70 cm | Black (10YR2/1) with abundant coarse dark greyish brown (2.5Y4/2) mottles as well as few fine to medium dark red (2.5YR4/8) and strong brown (7.5YR5/8) mottles; heavy clay; strong angular blocky and lenticular structure, parting to coarse polyhedral, parting to fine polyhedral structure; medium macropores common; shiny faced peds; pH 7.4; clear and wavy boundary to: | |
B22gss | 50/70 –90 cm | Black (10YR2/1) with many coarse dark greyish brown (2.5Y4/2) mottles (increasing with size and abundance with depth); heavy clay; prominent slickensides; medium macropores common; pH 8.2; clear boundary to: | |
B23k | 90+cm | Abundant calcium carbonate; highly calcareous; rounded dense basalt floaters; Field pH 9.5/10. |
pH | Salinity Rating | |||
Surface (A1 horizon) | Moderately Acid | Low | Non-Sodic | None1 |
Subsoil (B21 horizon) | Slightly Alkaline | Low | Non-Sodic | None2 |
Deeper Subsoil | Moderately Alkaline | Low | Non-Sodic | None2 |
The pH in the surface is moderately acid. The pH in the subsoil is slightly alkaline becoming moderately alkaline with depth. | The salinity rating is low throughout the profile. | The clay content is moderate throughout the profile. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | Exchangeable Cations | |||
Ca | Mg | K | Na | |||||
meq/100g | ||||||||
AP | 0-20 | 6 | 5.2 | 0.15 | 14 | 10 | 1.1 | 0.5 |
B21g | 20-50/70 | 7.4 | 6.4 | 0.12 | 14 | 13 | 0.93 | 0.85 |
B22g | 50/70-90 | 8.2 | 7.2 | 0.17 | 15 | 15 | 0.86 | 1.4 |
Horizon | Horizon Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | Oxidisable Organic Carbon % | Total Nitrogen % | 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 | 0-20 | <10 | 11 | 2.3 | 0.19 | 40.6 | 22.9 | 11 | 27 | 13 | 39 |
B21g | 20-50/70 | 5.9 | 42.6 | 22.5 | 11 | 28 | 13 | 46 | |||
B22g | 50/70-90 | 4.3 | 44.9 | 24.1 | 11 | 27 | 13 | 47 |