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MP40

Location: Nullawil.Australian Soil Classification: Epihypersodic, Pedal, Calcic, CALCAROSOL (clay loam surface).
General Landscape Description: Level plain with gilgai micro-relief (mallee vegetation).
Site Description: Wheat stubble paddock.Geology: Quaternary alluvial and aeolian sediments.

Photo: MP 40 landscape
Site MP40 Landscape


Soil Profile Morphology:

Surface Soil
Ap0-10 cmDark brown (10YR3/3); heavy sandy clay loam; weak-moderate medium blocky, parting to fine to very fine granular structure; soft surface condition; very weak consistence (dry); slightly calcareous; pH 7.9:

Photo: MP 40 profile
Site MP40 Profile
A1210-15 cmDark brown (10YR3/3); sandy clay; very firm consistence (dry); slightly calcareous; pH 8.4:

Subsoil

B21k15-30 cmStrong brown (7.5YR5/6); light medium clay; moderate-strong coarse to medium prismatic, parting to strong coarse to medium blocky structure; strong consistence (dry); soft calcareous nodules common (15%); macropores present; organic staining along ped faces; very highly calcareous; pH 9.0:

B22k30-70 cmPinkish brown (7.5YR7/4) with reddish yellow (7.5YR6/6) mottles; light medium clay; moderate coarse to medium polyhedral structure; very firm consistence (dry); many soft calcareous nodules (20%); most roots to 40 cm; pH 9.8:

B23k70-100 cmYellow (10YR7/6) with yellowish red (5YR5/8) mottles; medium clay; strong consistence (dry); soft calcareous nodules common; pH 9.8:

B24 100-130 cmYellow (10YR7/6) with few (5%) reddish yellow (5YR6/8) mottles; medium heavy clay; manganese flecks (5%); slightly calcareous; pH 9.2.

Key Profile Features
Soil Profile Characteristics:
pH
Salinity Rating
Surface
(A1 horizon)
Slightly Alkaline
Low
Non-Sodic
None1
Subsoil
(B21 horizon)
Strongly Alkaline
Low
Sodic
None
Deeper subsoil
(at 100-130 cm)
Very Strongly Alkaline
Very High
Strongly Sodic
Moderate
1Moderate dispersion after remoulding (noted in the field).
Photo: MP 40 graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH (CaCl2)
EC
1:5
NaCI
%
Exchangeable Cations
Boron
(CaCl2)
mg/kg
Field
Capacity
pF 2.5
Wilting
Point
pF 4.2
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
0-10
7.9
7.4
0.26
0.02
15
5.0
2.4
5.0
2.7
23
12
31
28
12
25
A2
10-15
8.4
7.7
0.20
14
6.6
1.2
1.1
3.7
25
13
34
25
10
27
B21k
15-30
9.0
8.3
0.31
0.02
15
11
1.1
2.0
4.5
33
19
29
17
14
32
B22k
30-70
9.8
9.2
0.82
3.6
14
1.3
7.1
23
34
22
18
16
10
34
B23k
70-100
9.8
9.6
1.4
0.15
2.6
14
1.8
11
45
25
B24
100-130
9.2
9.1
1.4
0.20
2.3
16
1.9
13


Notes: Most roots observed to 40 cm depth.

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

This page contains material sourced from the Victorian Resources Online (VRO) website, originally published by the State Government of Victoria.

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