Location: Mt Gow “Big Phalaris Paddock”
Aust. Soil Class.:Calcic, Epipedal, Black VERTOSOL
General Landscape Description: Pit excavated 20 metres north of west gate into paddock. Excavation in headland
Site Description: Canola stubble
Geology: Basalt
SFS 18 |
Surface Soil | SFS 18 | ||
Ap | 0-20 cm | Very dark greyish brown (10YR 3/2 moist) to dark greyish brown (10YR 4/2 dry); medium clay; strongly pedal, thin surface mulch of fine polyhedral peds (2-10 mm) or sometimes a thin weak crust fractured by cracks at 20 – 50 mm; coarse polyhedral and sub-angular blocky beds underlying surface mulch or crust; very firm to strong consistence; some larger cracks visible at surface; medium clay; pH 5.7; abrupt change to: | |
Subsoil | |||
B21t | 20-50 cm | Very dark grey (10YR 3/1 moist); heavy clay; coarse prismatic, parting to coarse polyhedral structure; main prismatic units clearly defined by deep cracking to 60+ cm depth; slickensides (>50 mm) begin at around 45 cm depth and dominate structure below 50 cm; pH 7.0; gradual change to: | |
B22ss | 50+ cm | Very dark greyish brown (10YR 3/2 moist) to dark greyish brown (10YR 4/2 dry) with many (25%) dark yellowish brown (10YR 4/4) mottles; heavy clay; with prominent slickensides;pH 7.8; gradual change to: | |
C | 70+ cm | Hard rounded weathering basaltic rock; pH 8.6. |
Raised beds | Cracking in bed farrow | Subsoil ped |
pH | Salinity Rating | |||
Surface (A1 horizon) | Moderately Acid | Low-Medium | Non-Sodic | None1 |
Subsoil (B21 horizon) | Neutral | Low-Medium | Sodic | Slight-Moderate |
Deeper subsoil (at 60+ cm) | Strongly Alkaline | Strongly Sodic | Moderate |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC dS/m | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
Ap | 0-8 | 5.7 | 5.2 | 0.46 | 0.036.3 | 7.9 | 7.9 | 2.4 | 0.8 |
B21 | 15-30 | 7.0 | 6.3 | 0.43 | 0.02 | 7.4 | 13 | 2.9 | 3.6 |
B21 | 30-50 | 7.8 | 7.2 | 0.31 | 0.02 | 7.8 | 14 | 2.4 | 4.8 |
B22 | 50-65 | 8.6 | 7.8 | 0.47 | 0.03 | 8.1 | 18 | 1.9 | 6.6 |
Horizon | Horizon Depth (cm) | Exchangeable Aluminium mg/kg | Exchangeable Acidity meq/100g | 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 | 0-8 | 16 | 38.0 | 22.8 | 4.0 | 28.9 | 16.5 | 41.0 | |
B21 | 15-30 | 43.7 | 27.0 | 1.7 | 25.6 | 14.0 | 51.0 | ||
B21 | 30-50 | 47.1 | 31.1 | 2.0 | 25.8 | 15.0 | 50.5 | ||
B22 | 50-65 | 52.2 | 34.9 | 2.0 | 24.3 | 16.5 | 52.5 |