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MP46

Location: Birchip.Australian Soil Classification: Epihypersodic, Pedal, Calcic, CALCAROSOL (clayey surface).
Geology: Quaternary alluvial and aeolian deposits.General Landscape Description: Level plain.
Site Description: Cropping paddock (GRDC trial site).

Photo: MP 46 landscape
Site MP46 Landscape


Soil Profile Morphology:

Surface Soil
A10-10 cmReddish brown (5YR4/4); light clay; soft surface condition; very firm consistence (dry); slightly calcareous; pH 8.2; clear change to:Photo: MP 46 profile
Site MP46 Profile
Subsoil

B21
10-25 cm
Dark reddish brown (5YR3/3); light medium clay; strong medium to fine subangular blocky, parting to moderate very fine polyhedral structure; very firm consistence (dry); slightly calcareous; pH 9.1; clear change to:

B22k
25-40 cm
Reddish brown (5YR4/4); light medium clay; strong-moderate very coarse to coarse prismatic, parting to strong coarse to medium subangular blocky structure; firm consistence (slightly moist); few (5-10%) fine-earth carbonates; pH 9.2; clear change to:

B23k
40-65 cm
Reddish yellow (5YR6/8); light medium clay; weak-moderate very coarse to coarse prismatic, parting to strong coarse to medium blocky structure; macropores present; firm consistence (slightly moist); few (5-10%); fine-earth carbonates; pH 9.4; gradual change to:

B24
65-105 cm
Reddish yellow (5YR6/8); light medium clay (sandy); moderate coarse polyhedral structure; weak consistence (slightly moist); few (2-5%) fine-earth carbonates; pH 9.5:

B25
105+ cm
Reddish yellow (5YR6/6); medium heavy clay; strong consistence (moist); few (2-5%) fine-earth carbonates and few (2-5%) manganese flecks; pH 9.4.

Key Profile Features:
Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Moderately Alkaline
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Very Strongly Alkaline
Medium
Non-Sodic
Slight-Moderate1
Deeper subsoil
(at 105+ cm)
Very Strongly Alkaline
Very High
Strongly Sodic
None2
1Complete dispersion after remoulding.
2 Probably due to high levels of soluble salts.

Photo: MP 46 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 - 2.0 mm)
Fine Sand
(0.02 -0.2 mm)
Silt
(0.002 -0.02 mm)
Clay
(<0.002 mm)
Ca
Mg
K
Na
meq/100g
A1
0-10
8.2
7.7
0.21
20
4.4
2.2
0.94
2.7
38
15
25
25
12
34
B21
10-25
9.1
8.4
0.63
0.09
20
4.8
2.7
1.0
8.2
51
24
18
16
2
58
B22k
25-40
9.2
8.7
1.5
0.26
11
16
2.3
14
34
62
29
12
13
3
64
B23k
40-65
9.4
9.3
1.9
0.33
6.7
14
2.3
16
42
59
28
10
12
4
58
B24
65-105
9.5
8.8
1.7
0.3
5.5
11
1.7
14
33
51
29
18
15
6
43
B25
105+
9.4
9.1
1.8
0.3
5.7
11
1.6
13

Notes: Most roots evident to 45 cm depth.

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

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