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LSWW02

WLRA - soil pit WW20- landscape
Undulating plain and rise near Servicetown


    Location

Western Highway, Servicetown, western Victoria

    Landform

Rise

    Geology

Quaternary Woorinen Formation:
aeolian dune sand, calcareous clay

    Element

Hillcrest

Horizon
Depth (cm)
Description

A1

0-5

Fine sandy clay loam; weak fine blocky structure; pH 6.4; clear boundary to:
WLRA - soil pit WW20- profile
Hypercalcic, Subnatric, Red SODOSOL

B21

5-25

Yellowish red (5YR5/6);
medium clay; weak to moderate coarse prismatic, parting to weak fine subangular blocky structure; rough ped-fabric; rigid consistence when dry; patches of dark greyish brown (10YR4/2) with stronger structure; pH 7.8; gradual and wavy boundary to:

B22k

25-45

Yellowish red (5YR5/6)
medium clay (sandy); weak to moderate coarse blocky, parting to moderate very fine subangular blocky structure; rough ped-fabric; rigid consistence when dry; many (20-50%) soft calcareous segregations; pH 8.8; abrupt boundary to:

B23k

45-80

Very pale brown (10YR7/3) with many coarse faint reddish yellow mottles;
light medium clay; moderate coarse blocky, parting to moderate medium polyhedral structure (strong structure when less CaCO3); smooth ped-fabric; strong consistence when slightly moist; many (50%) soft calcareous segregations although percentage is variable with some thick patches occurring; pH 9.8; diffuse boundary to:

B24

80-110

Very pale brown (10YR7/3) with common large distinct light brown mottles ;
light medium clay (sandy); moderate coarse blocky, to polyhedral structure; smooth ped-fabric; very firm consistence when slightly moist; many soft calcareous segregations; pH 9.8; gradual to diffuse boundary to:

B25

110-190

Very pale brown (10YR7/4) with common large distinct yellowish red mottles;
light medium clay (sandy); moderate blocky to polyhedral structure; smooth ped-fabric; firm consistence when moderately moist; pH 9.7; changes to:

B26

190-200+

Very pale brown (10YR7/3) with common coarse distinct yellow and red mottles;
medium clay; moderate coarse polyhedral structure; smooth ped-fabric; firm consistence when moderately moist; mangans evident; pH 9.3.

Management Considerations

  • Texture contrast looking soil, occasional gradational texture trend.
  • Shallow depth of topsoil, susceptible to sheet, rill erosion.
  • Sodic, dispersive subsoil.
  • Increasing alkalinity down profile, highly alkaline below upper subsoil, decreasing very slightly at depth.
  • Calcium carbonate rich horizons below the upper subsoil.
  • Mottling in subsoil.
  • Soil salinity increases at depth.
  • Plant Available Water Capacity (PAWC) is considered to be medium (estimated at 100 mm) for this site profile based on an Effective Rooting Depth (ERD) of 45 cm. Rooting depth will be restricted by subsoil conditions, such as strongly sodic (Exchangeable Sodium Percentage >20%), high soluble salt levels (chloride >0.1%), poor structure (e.g. massive or very coarse, columnar or prismatic), very high carbonate (lime) content (not applicable to all plant species) or hard rock.

Horizon
Depth (cm)
pH (water)
pH (CaCl2)
EC
dS/m
NaCl
%
Exchangeable Cations
cmol-/kg
Coarse Sand
%
Fine Sand
%
Silt
%
Clay
%
Ca
Mg
K
Na
A1
0-5
6.4
5.4
0.07
3
1
0.7
0.2
26.4
54.2
4.5
10
B21
5-25
7.8
6.5
0.1
5.8
4.8
1
1.8
21.5
44.5
4
26
B22k
25-45
8.8
7.5
0.16
5.8
7.3
1.1
3.4
20.2
38.6
3.5
32
B23k
45-80
9.8
9
0.72
0.08
3.3
9.6
1.5
7.1
B24
80-110
9.8
8.8
0.73
0.09
B25
110-190
9.7
8.8
0.72
0.09
B26
190-200+
9.3
8.4
0.66
0.09
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