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ALRA67

WLRA - soil pit ALRA67 - landscape
Colluvial fan leading to Mount William Creek
    Site Code
ALRA67



WLRA - soil pit ALRA67 - profile
Eutrophic, Mottled-Subnatric, Grey Sodosol

    Location

Moyston West Road

    Landform

Gently undulating plain

    Geology

Quaternary alluvium

    Element

Plain

    Slope

1%

    Aspect

South
Horizon
Depth (cm)
Description

A1

0–5

Dark greyish brown (7.5YR3/1); coarse sand; massive (structureless); very weak consistence when moderately moist; pH 6.5; clear and smooth boundary to:

A21

5–30

Light grey (10YR7/2); sporadically bleached (7.5YR6/3 dry); loamy sand; massive structure(structureless); very weak consistence when dry; pH 6.5; clear and wavy boundary to:

A22

30–45

Pinkish grey (7.5YR7/2); sporadically bleached (7.5YR7/3 dry); loamy sand; massive (structureless); weak consistence when moderately moist; pH 6.5; gradual and wavy boundary to:

A23

45–60

White (10YR8/2) with few coarse faint brownish yellow mottles; sporadically bleached (10YR7/3 dry); clay loam; massive (structureless); weak consistence when dry; pH 5.5; sharp and wavy boundary to:

B21

60–75

Greyish brown (10YR5/2) with many medium to coarse distinct brownish yellow (10YR6/6) mottles; medium clay, coarse sandy; moderate fine angular blocky structure; rough ped-fabric; firm to very firm consistence when moist; common prominent clay skins; pH 5.5; clear and wavy boundary to:

B22

75–140+

Greyish brown (2.5Y5/2) with many very coarse distinct yellowish brown (10YR5/6) mottles; light medium clay; weak medium subangular blocky structure; rough ped-fabric; weak consistence when moist; pH 7.0.
Management considerations
  • High permeability and water drainage capacity through the A horizon
  • Texture contrast soil with clay percentage decreasing with subsoil depth
  • Lateral flow of water along the top of the B horizon and little organic matter evident in the pale bleached A2 horizon
  • Acidic to neutral surface and subsurface soil, strongly acidic subsoil. Less nutrient availability
  • Many fine roots are observed to the top of the B horizon where higher clay content (35.5%) and sodic nature of B21 restricts root growth
  • Distinct mottling and clayey subsoils indicate limitations to drainage
  • Subsoil dispersion is very high, while there is insufficient aggregation in the upper soil (loose or very weak consistence)
Site
ALRA67
Sample depth cm
pH
EC
dS/m
NaCl
%
Organic Carbon
%
Ex Ca
cmol-/kg
Ex Mg
cmol-/kg
Ex K
cmol-/kg
Ex Na
cmol-/kg
Ex Al
cmol-/kg
Ex acidity
cmol-/kg
FC
-30okPa
PWP
-1500okPa
KS
%
FS
%
Z
%
C
%
Horizon
H2O
CaCl2
A1
0-5
5.6
5.2
0.18
NA
4.7
7.3
2.1
0.41
0.35
<10
8.2
14
10.5
48.6
39.4
5.5
1.0
A21
5-30
5.9
5.5
<0.05
NA
NA
0.58
0.16
0.05
0.05
<10
<1.0
4.7
0.6
48.8
43.5
7.0
0.5
A22
30-45
6.4
6.1
<0.05
NA
NA
0.41
0.13
<0.05
0.05
<10
<1.0
4.7
0.7
51.8
40.8
5.5
0
A23
45-60
6.2
5.8
<0.05
NA
NA
0.23
0.12
<0.05
0.06
<10
<1.0
4.2
0.4
46.3
43.0
8.5
1.0
B21
60-75
5.1
4.2
0.17
NA
NA
0.79
4
0.32
1.7
280
12
23.7
13.2
37.1
21.8
2.0
36.5
B22
75-140+
5.5
4.5
0.16
NA
NA
0.64
2.5
0.14
1.5
95
4.5
14.5
6.4
48.3
32.2
3.5
14.5

Note: NA=not assessed

Site
ALRA67
Sample depth cm
pH
EC
dS/m
TSS
%
P (Olsen)
(mg/kg)
Total N
&
Organic Carbon
%
Organic matter
%
Horizon
H2O
CaCl2
Bulk sample
0–10
5.6
5.2
0.16
0.05
14
0.18
2.8
5.3
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