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MP42

Location: Nullawil.Australian Soil Classification: Epihypersodic, Pedal, Hypercalcic, CALCAROSOL (loamy surface).
Geology: Quaternary alluvial & aeolian deposits.General Landscape Description: Level plain with gilgai microrelief.
Site Description: Cropping paddock (with barley stubble).

Photo: MP 42 landscape
Site MP42 Landscape


Soil Profile Morphology:

Surface Soil
Ap0-5 cmBrown (7.5YR4/2); sandy clay loam; soft surface condition; weak-moderate medium to fine polyhedral structure; very weak to weak consistence (dry); moderately calcareous; pH 8.4; sharp change to:Photo: MP 42 profile
Site MP42 Profile
Subsoil

B21
5-15 cm
Brown (7.5YR4/4); sandy clay; weak-moderate very coarse prismatic, parting to weak-moderate coarse to medium blocky structure; very firm consistence (dry); moderately calcareous; pH 8.7; clear change to:

B22
15-30 cm
Brown (7.5YR4/4); sandy clay; weak-moderate very coarse prismatic structure; firm to very firm consistence (dry); moderately calcareous; pH 8.7; clear change to:

B23k
30-45 cm
Yellowish red (5YR5/6); light medium clay (sandy); weak-moderate very coarse prismatic structure; firm to very firm consistence (dry); fine-earth carbonates common (20%); pH 9.4; gradual change to:

B24k
45-110 cm
Reddish yellow (5YR6/6); light medium clay (sandy); weak-moderate coarse to medium polyhedral structure; firm consistence (dry); very many (80%) fine-earth carbonates; pH 10.0; clear and irregular change to:

B25k
110-130 cm
No sample taken.

B3
130+ cm
Light brownish grey (2.5Y6/2) with many (40%) reddish brown (5YR5/4) mottles; medium heavy clay; strong coarse to medium polyhedral structure (smooth-faced peds); few (5%) manganese flecks; pH 9.6.

Key Profile Features:
 Soil Profile Characteristics:
pH
Salinity Rating
Surface
(Ap horizon)
Moderately Alkaline
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Strongly Alkaline
Low
Non-Sodic
None
Deeper subsoil
(at 45-110 cm)
Very Strongly Alkaline
High
Strongly Sodic
Moderate
Photo: MP 42 pH
Photo: MP 42 salinity
Photo: MP 42 sodicity

Photo: MP 41 clay


Photo: MP 42 boron


Horizon
Horizon Depth
(cm)
pH
(water)
pH (CaCl2)
EC
1:5
NaCI
%
Exchangeable Cations
Boron
(CaCl2)
mg/kg
Field
Capacity
pF2.5
Wilting Point
pF4.2
Coarse Sand
(0.2 - 2.0 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
0-5
8.4
8.0
0.22
24
2.9
2.4
0.22
2.6
21
10
37
27
15
16
B21
5-15
8.7
8.2
0.23
27
5.4
1.6
0.58
2.4
27
14
31
24
18
23
B22
15-35
8.7
8.2
0.35
<0.01
17
7.2
1.5
1.0
27
15
35
20
13
24
B23k
35-45
9.4
8.6
0.40
0.03
9.3
9.2
0.9
3.0
5
29
15
31
18
5
26
B24k
45-110
10
9.1
0.93
0.11
2.1
8.1
1.3
8.1
31
16
B25k
110-130
B3
130+
9.6
9.5
1.3
0.07
2.4
13
2.1
12

Notes: Most roots observed to 40 cm depth.

Profile Described By: Mark Imhof, April 2004.
CC BY 4.0 AU

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