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MOP1

Location: Baxter

Aust. Soil Class: Bleached-Vertic, Eutrophic, Brown CHROMOSOL
General Landscape Description: Plateau of gently undulating rise. Natural vegetation includes Swamp Gum (Eucalyptus Ovata), Snow Gum (Eucalyptus Pauciflor) and Narrow-leaved Peppermint (Eucalyptus Radiata).
Site Description: Low input paddock.Geology: Tertiary (Baxter Sandston)

MOP1 and 2 Landscape
MP1 & 2 Landscape

Soil Profile Morphology:

Surface soil
MOP1 Profile
MP1 Profile
A10-15 cmVery dark greyish brown (10YR3/2); light fine sandy clay loam; moderate to strong, coarse to very fine (2-50 mm) polyhedral structure; very firm consistence dry; pH 5.9; gradual change to:


A2


15-30 cm


Brown (10YR5/3), conspicuously bleached (10YR7/2 dry); light fine sandy clay loam; moderate, medium to fine (5-20 mm) blocky structure; strong consistence dry; some rusty root channel mottling; pH 6.1; clear change to:

Subsoil
B21


30-45 cm


Yellowish brown (10YR5/4) with diffuse brown (10YR4/3) mottles; medium heavy clay; strong consistence dry; strong, medium to coarse (10-50 mm) subangular blocky structure; pH 6.2; clear change to:

B2245-80 cm

Light yellowish brown (2.5Y6/4) with yellowish red (5YR5/6) mottles; medium clay; strong consistence dry; strong, medium to very fine (2-20 mm) polyhedral structure; pH 7.1; gradual change to:

B23

80-135 cm

Yellowish brown (10YR5/6) with very many (30%) red (2.5YR4/8) and light grey (10YR7/1) mottles; heavy clay; moderate medium (20-50 mm) prismatic, parting to strong medium (20-50 mm) subangular blocky, and further parting to strong fine (5-10 mm) polyhedral structure; strong consistence dry; pH 5.9:

B3

135+ cm

Reddish grey (2.5Y6/1) with dark yellowish brown (10YR4/6) and yellowish brown (10YR5/6) mottles; heavy clay; moderate, fine (5-10 mm) lenticular structure; pH 6.1.

Key Profile Features:
  • Strong texture contrast between surface (A) horizons (17% clay) and upper subsoil (B21) horizon (62% clay).
  • Conspicuously bleached subsurface (A2) horizon.

    pH
    Salinity Rating
    Surface
    (A1 horizon)
    Moderately Acid
    Very Low
    Non-Sodic
    None
    Subsoil
    (B21 horizon)
    (30-45 cm)
    Slightly Acid
    Very Low
    Non-Sodic
    None 1
    Deeper subsoil
    (at 135+ cm)
    Slightly Acid
    Low-Medium
    Marginally Sodic
    None
    1 moderate dispersion after remoulding.

Soil Profile Characteristics:

MOP1 Graphs



Horizon
Horizon Depth
pH
(water)
pH
CaCl2
EC 1:5
Exchangeable Cations
Ex Al
mg/kg
Ex Ac
meq/100g
Field
pF2.5
Wilting Point
pF4.2
Coarse Sand
(0.2-2.0mm)
Fine Sand
(0.02-0.2mm)
Silt
(0.002-0.02mm)
Clay
(<0.002mm)
Ca
Mg
K
Na
meq/100g
A1
0-15
5.9
5.3
0.08
6.0
2.6
0.36
0.17
<10
10
30.7
10.6
7
45
21
17
A2
15-30
6.1
5.4
<0.05
3.6
2.1
0.11
0.16
<10
7.3
25.5
7.7
12
45
21
17
B21
30-45
6.2
5.5
0.07
4.1
6.3
0.14
0.54
<10
11
37.5
21.5
5
47
7
62
B22
45-80
7.1
6.7
0.12
2.8
7.6
0.14
0.94
43.6
26.6
4
22
12
69
B23
80-135
5.9
5.6
0.27
1.7
6.5
0.2
1.0
<10
9.5
48.2
28.6
8
12
19
34
B3
135+
6.1
5.7
0.44
0.8
4.5
<0.1
1.2
<10
11


Notes: Soil profile described by Mark Imhof and Ian Sargeant (November 2006).

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