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ALRA064

WLRA - soil pit ALRA64 - landscape
Jallukar Forest
    Site Code
    ALRA064



    Location

    Jallukar Forest, Jallukar

    Landform

    Gentle plain

    Geology

    White Hills Gravel: sediments

    Element

    Footslope

    Slope

    3%

    Aspect

    South-west
Description
Horizon
Depth (cm)

A1

0–10

Greyish brown (10YR5/2); sandy loam; massive (structureless); very weak consistence when moderately moist; few medium sized quartz coarse fragments; pH 6.0; clear boundary to:
WLRA - soil pit ALRA64 - profile
Vertilc, Mottled-Subnatric, Brown SODOSOL

A2

10–25

Light yellowish brown (2.5Y6/3); conspicuously bleached (10YR8/1 dry); sand; massive (structureless); very weak consistence when dry; pH 6.5; abrupt boundary to:

B21

25–55

Brown (10YR5/3) with many medium distinct dark yellowish brown (10YR4/6) mottles; medium heavy clay; moderate coarse columnar, parting to moderate medium prismatic structure; smooth ped-fabric; strong consistence when moderately moist; pH 7.0; gradual boundary to:

B22

55–85

Brownish yellow (10YR6/6) with few fine faint orange mottles; medium heavy clay; moderate coarse prismatic structure; smooth fabric; very firm consistence when moderately moist; very few subangular quartz coarse fragments; very few fine manganiferous nodules; few distinct mangans and slickensides; pH 7.0; distinct boundary to:

B23

85–100+

Olive yellow (2.5Y6/6) with few fine faint orange mottles; medium heavy clay; weak coarse polyhedral structure; smooth ped-fabric; very firm consistence when moderately moist; very few subangular quartz coarse fragments; common distinct slickensides; pH 7.0.

Management Considerations:

  • Surface soil is strongly acidic becoming slightly alkaline with depth
  • Strong texture contrast profile, with cemented capping on top of subsoil
  • Surface soil susceptible to sheet erosion due to apedal nature of topsoil, high sand content and likely low organic carbon levels
  • Roots are common to B21 horizon but few beneath that due to extremely dense (71.5% clay) and sodic nature
  • Sodic subsoil liable to dispersion, very highly dispersive, low nutrient potential and higher salinity than A1 and A2 horizons
  • Presence of mottles and pale clayey subsoils indicates restricted drainage

Chemical Analysis:
Horizon
Depth (cm)
pH (water)
pH (CaCl2)
EC
dS/m
NaCl
%
Exchangeable Cations
cmol-/kg
Field Capacity
(pF2.5)
Wilting Point
(pF4.2)
Coarse Sand
%
Fine Sand
%
Silt
%
Clay
%
Ca
Mg
K
Na
A1
0–10
5.4
4.9
<0.05
1.4
0.41
0.28
0.11
9.5
2.7
29.8
53.0
9.0
3.0
A2
10–25
6.3
6.0
0.05
0.44
0.36
0.1
0.18
7.3
1.3
29.8
54.2
12.0
2.0
B21
25-55
6.9
6.4
0.56
1.5
7.4
0.4
1.9
28.7
22.6
6.2
13.7
6.0
71.5
B22
55-85
7.4
6.8
0.58
0.7
8.9
0.4
3.9
27.1
16.4
11.8
23.9
7.5
53.5
B23
85--100+
7.5
6.9
0.62
0.14
0.7
8.9
0.3
4.3
10.5
15.2
13.2
23.0
13.5
49.0
CC BY 4.0 AU

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The content is provided under the Creative Commons Attribution 4.0 Australia licence (CC BY 4.0 AU).

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