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ALRA66

WLRA - soil pit ALRA66 - landscape
Colluvial slopes leading to Mt William Creek
    Site Code
ALRA66



WLRA - soil pit ALRA66 - profile
Parapanic, Humosesquic, Aeric Podosol

    Location

Long Gully Road, Pomonal

    Landform

Scarp-footslope

    Geology

Grampians colluvium

    Element

Hillslope

    Slope

5%

    Aspect

North
Horizon
Depth (cm)
Description

A11

0–10

Very dark grey (7.5YR2.5/1); loamy sand; massive (structureless); very weak consistence when moderately moist; many fine roots; pH 5.5; clear and wavy boundary to:

A12

10–30

Dark greyish brown (7.5YR4/1); loamy sand; massive (structureless); very weak consistence when dry; common very fine roots; pH 5.0; clear and smooth boundary to:

A2

30–55

Pinkish grey (7.5YR6/2); sporadically bleached (7.5YR7/1 dry); loamy sand; massive (structureless); very weak consistence when dry; common very fine roots; pH 5.5; abrupt and tongued boundary to:

Bhs

55–95

Olive yellow (2.5Y6/6); "coffee rock layer"; massive (structureless); very firm consistence when dry; moderately cemented discontinuous massive orstein pan; common very fine roots; pH 6.0; clear and wavy boundary to:

B2

95–120+

Light brownish grey (10YR6/2) with many very coarse prominent brownish yellow mottles; medium clay; massive (structureless); very firm consistence when dry; common prominent slickensides; common very fine roots; pH 6.5.
Management considerations
  • A horizon has been leached, particularly subsurface soil
  • High permeability and water drainage capacity through the A horizon
  • Coffee rock formed at the boundary of the A and B horizons from the accumulated deposits of organic matter and sesquioxides
  • Many fine roots are observed to the top of the B horizon where the orstein pan "coffee rock" provides an impediment to root growth (especially perennial and annual grasses)
  • Old former tree roots penetrating the B horizon give effect of horizon tonguing
  • Lateral flow of water along the top of the B horizon is evident
  • Strongly acidic profile, low nutrient statuswith a low base nutrient status
Site
ALRA66
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
A11
0-10
5.5
4.9
0.05
NA
3.5
5.3
0.75
0.22
0.1
<10
7.1
4.5
5.7
44.3
43.6
5.0
1.5
A12
10-30
4.3
3.9
<0.05
NA
0.99
0.48
0.07
0.07
<0.05
33
3.7
4.3
1.1
45.2
46.8
4.0
2.5
A2
30-55
4.3
4
<0.05
NA
NA
0.19
<0.05
0.05
<0.05
19
1.6
7.4
0.7
45.2
47
5.5
2.5
Bhs
55-95
5.6
5.2
<0.05
NA
NA
0.55
0.12
0.06
0.07
19
8.5
21.3
2.4
37.1
49.1
6.5
2.5
B2
95-120+
5.3
4.5
<0.05
NA
NA
0.8
3.4
0.44
0.12
150
NA
22.1
12.1
25.1
37.7
5.0
31.5

Note: NA=not assessed

Site
ALRA66
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
5.3
4.7
0.05
0.02
29
0.16
3.1
5.9
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