Location: Curyo. | Australian Soil Classification: Vertic (& Epihypersodic), Pedal, Calcic, CALCAROSOL. |
Geology: Quaternary (Woorinen Formation) overlying Tertiary (Parilla Sandstone) within 2 metres of the surface. | |
General Landscape Description: Level plain. When the area was first cleared there was evidense of large gilgai microrelief. | |
Site Description: Demonstration site for the Birchip Cropping Group 2002. | Native Vegetation: Mallee. |
Site ORZC12 Landscape |
Ap | 0-12 cm | Brown (7.5YR4/4); heavy clay loam; soft surface condition; weakly structured; weak consistence (moist); moderately calcareous; pH 8.8; abrupt change to: | Site ORZC12 Profile |
Subsoil | |||
B21 | 12-35 cm | Yellowish red (5YR5/6); light medium clay; weak-moderate very coarse prismatic, parting to moderate-strong coarse to medium blocky structure; some organic staining along ped faces; few (5-10%) soft calcium carbonate segregations; very firm consistence (dry); highly calcareous; pH 9.3; gradual change to: Note: some patches of the B21 horizon are light pinkish brown (7.5YR7/4) with few reddish yellow (5YR6/6) mottles and display strong prismatic structure with a common (10-20%) amount of fine earth carbonate segregations. | |
B22k | 35-60 cm | Pinkish brown (7.5YR7/4) with yellowish red (5YR5/8) mottles; medium clay; weak-moderate coarse to very coarse prismatic, parting to moderate coarse blocky structure; few (5%) fine earth carbonate segregations; highly calcareous; strong consistence (dry); pH 9.7; gradual change to: | |
B23 | 60-85 cm | Very pale brown (10YR7/3) with yellowish red (5YR5/6) mottles along root channels; medium clay; weak-moderate coarse prismatic, parting to moderate medium to fine polyhedral structure; trace of fine earth carbonate segregations; flecks of manganese in 70-80 cm zone, mainly down root channels; firm consistence (moderately moist); pH 9.4; non-calcareous; gradual change to: | |
B3 | 85-130 cm | Very pale brown (10YR7/3); medium heavy clay; possibly coarser prismatic, parting to moderate-strong lenticular structure; weak consistence (moist); pH 5.2. |
pH | Salinity Rating | |||
Surface soil (Ap horizon) | Strongly Alkaline | Low | Sodic | None 1 |
Upper subsoil 12-35 cm | Very Strongly Alkaline | Low | Strongly Sodic | None 1 |
Deeper subsoil (at 60-85) | Very Strongly Alkaline | High | Strongly Sodic | Strong |
Deep subsoil (at 85-130 cm) | Strongly Acid | Very High | Strongly Sodic | None 2 |
Horizon | Horizon Depth (cm) | pH (water) | pH (CaCl2) | EC 1:5 | NaCI % | Exchangeable Cations | Boron 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 | 0-12 | 8.8 | 8.1 | 0.28 | 0.01 | 17 | 7.3 | 2 | 2.2 | 4.8 | 44 | 21 | 21 | 23 | 15 | 31 |
B21 | 12-35 | 9.3 | 8.5 | 0.44 | 0.02 | 12 | 11 | 1.3 | 5.2 | 13 | 50 | 30 | 15 | 18 | 10 | 42 |
B22k | 35-60 | 9.7 | 9.5 | 0.93 | 0.09 | 9.7 | 16 | 1.5 | 13 | 54 | 49 | 25 | 13 | 17 | 13 | 4 |
B23 | 60-85 | 9.4 | 9.1 | 1.2 | 0.14 | 3 | 14 | 1.7 | 14 | 41 | 52 | 24 | 12 | 18 | 14 | 49 |
B3 | 85-130 | 5.2 | 4.7 | 1.6 | 0.26 | 2 | 8.3 | 0.9 | 8.6 | 8.2 | 23 | 11 |