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MP41

Location: Nullawil.Australian Soil Classification: Bleached-Sodic, Calcic, Grey, DERMOSOL (clayey surface).
Geology: Quaternary alluvial & aeolian sediments.General Landscape Description: Level plain (floodplain of Tyrell Creek).
Site Description: Cropping paddock.

Photo: MP 41 landscape
Site MP41 Landscape


Soil Profile Morphology:

Surface Soil

Ap0-8 cmVery dark greyish brown (10YR3/2); light clay; soft surface condition; weak consistence (dry); pH 7.4:

Photo: MP 41 profile
Site MP41 Profile
A128-10 cmBrown (10YR5/3) conspicuously bleached (10YR7/1 dry); heavy sandy clay loam; firm consistence (dry); pH 8.1:

Subsoil

B2110-30 cmLight brownish grey (10YR6/2) with few (5%) faint brownish yellow (10YR6/6) mottles; medium clay; moderate coarse prismatic, parting to strong coarse to medium blocky structure; strong consistence (dry); pH 8.3:

B2230-50 cmGreyish brown (10YR5/2); medium heavy clay; strong coarse to medium blocky structure; strong consistence (dry); few (5%) medium (3-10 mm) calcareous nodules; pH 9.4:

B23k50-80 cmReddish yellow (7.5YR7/6); medium heavy clay; fine-earth carbonates and calcareous nodules common (15%); pH 9.8:

B24k80-100 cmReddish yellow (7.5YR7/6); medium clay; fine-earth carbonates common (15%); pH 9.8:

B25100-140 cmReddish yellow (7.5YR7/6); medium clay; very few (2%) manganese stains; pH 9.8.

Key Profile Features:
  • Lack of strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
  • Clayey surface horizons.
  • Fine-earth carbonates common in deeper subsoil.
Soil Profile Characteristics:
pH
Salinity Rating
Surface
(Ap horizon)
Slightly Alkaline
Low
Non-Sodic
None1
Subsoil
(B21 horizon)
Strongly Alkaline
Low
Sodic
Moderate
Deeper subsoil
(at 100-140 cm)
Very Strongly Alkaline
Very High
Strongly Sodic
strong
1 Moderate-strong dispersion after remoulding.

Photo: MP 41 graphs
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 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
0-8
7.4
6.9
0.24
12
5.3
1.6
0.85
2.3
24
13
25
28
9
32
A2
8-10
8.1
7.2
0.13
9.2
4.3
0.68
0.92
1.7
22
11
28
27
11
32
B21
10-30
8.3
7.4
0.16
13
7
0.98
1.7
2.5
31
16
22
20
9
46
B22
30-50
9.4
8.4
0.25
18
8.7
1.1
3.3
5.6
39
18
23
19
7
46
B23k
50-80
9.8
9.5
0.44
<0.01
6.4
11
1.4
7.7
47
20
B24k
80-100
9.8
9.4
0.52
0.01
5.4
11
1.4
9.0
B25
100-140
9.8
9.5
0.62
0.03

Profile Described By: Mark Imhof, April 2004.
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