Location: Maffra. | Australian Soil Classification: Sodic, Eutrophic, Red CHROMOSOL. |
Great Soil Group: solodic. | Geology: Quaternary prior stream deposits. |
General Landscape Description: Level plain. | Mapping Unit: Tinamba. |
Site Description: Irrigated dairy grazing paddock (non laser graded). |
Site GP30 Landscape |
Surface Soil | Site GP30 Profile | ||
A1 | 0-40 cm | Reddish brown (5YR4/3); fine sandy clay loam; pH 5.2; gradual change to: | |
A2 | 40-60 cm | Reddish brown (5YR5/4); sporadically bleached; fine sandy loam; macropores evident; pH 6.0; sharp change to: | |
Subsoil | |||
B21 | 60-100 cm | Yellowish red (5YR4/6) with dark stains (manganese oxide) on some ped faces; light medium clay; coarse prismatic, parting to strong coarse to medium blocky structure; strong consistence dry; some manganese flecks; pH 6.5; gradual change to: | |
B22 | 100 + cm | Reddish brown (5YR5/4); light medium clay; coarse prismatic, parting to weak to moderate blocky structure; pH 7.7. |
Horizon | pH | Salinity Rating | ||
Surface (A1 horizon) | Strongly Acid | Very Low | Non-Sodic | None |
Subsoil (B21 horizon) | Slightly Acid | Very Low | Non-Sodic | None1 |
Deeper Subsoil (at 100+ cm) | Slightly Alkaline | Very Low | Sodic | None |
The profile becomes increasingly alkaline with depth. | The upper soil profile is non-sodic. The deeper subsoil becomes sodic. | ||
The level of soluble salts is very low throughout the profile. | The clay content increases significantly at the A/B horizon interface. |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCl | Exchangeable Cations | |||
Ca | Mg | K | Na | ||||||
meq/100g | |||||||||
A1 | 0-40 | 5.2 | 4.4 | <0.05 | 1.6 | 0.39 | 0.1 | 0.13 | |
A2 | 40-60 | 6 | 4.8 | <0.05 | 1.2 | 0.49 | 0.08 | 0.08 | |
B21 | 60-100 | 6.5 | 5.4 | <0.05 | 3.6 | 6.2 | 0.35 | 0.48 | |
B22 | 100+ | 7.7 | 6.6 | <0.05 | 2.6 | 6.1 | 0.2 | 0.5 |
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) |
A1 | 0-40 | 51 | 5.7 | 24 | 5 | 2 | 55 | 28 | 13 |
A2 | 40-60 | 18 | 4 | 2 | 56 | 32 | 13 | ||
B21 | 60-100 | 29 | 16 | 1 | 27 | 23 | 49 | ||
B22 | 100+ | 23 | 12 | 3 | 41 | 20 | 36 |