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MOP7

Location: Merrick NorthAustralian Soil Classification: Bleached-Ferric, Eutrophic, Brown CHROMOSOL (thick surface horizons)
Land Use: Vineyard

Soil Profile Morphology:

Surface Soil

A10-20 cmDark brown (7.5YR 3/2); light fine sandy clay loam; moderate medium sub-angular blocky structure; contains some ferruginised sandstone fragments; pH 6.8:MOP7 profile
MOP7 Profile
A220-35 cmConspicuously bleached; contains many (30%) ferromanganiferous nodules as well as ferruginised sandstone fragments
Subsoil
B2135-60 cmYellowish brown (10YR 5/4) with yellowish brown (10YR 5/6) mottles; medium heavy clay; strong coarse to very fine polyhedral structure; pH 6.0:
B2260-100 cmMedium heavy clay; strong coarse to fine polyhedral structure; pH 5.9:
B23100-130+ cmMedium heavy clay; strong coarse polyhedral, parting to moderate medium to fine lenticular structure; pH 5.9.

Key Profile Features:



Soil Profile Characteristics:

pH
Salinity Rating
Surface
(A1 horizon)
Slightly Acid
Subsoil
(B21 horizon)
Moderately Acid
Deeper subsoil
(at 100-130 cm)
Moderately Acid
1complete dispersion after remoulding


MOP7 graphs
Horizon
Horizon Depth
pH (water)
pH CaCl2
EC
1:5
Exchangeable Cations
Ca
Mg
K
Na
Meq/100g
A1
0-20
6.8
6.2
0.08
9.9
1.5
0.16
0.21
A2
20-35
B21
35-60
6.0
5.7
0.11
4.5
5.6
0.08
0.35
B22
60-100
5.9
5.6
0.1
3.6
7.1
0.07
0.57
B23
100-130+
5.9
5.5
0.09
2.5
7.8
0.06
0.78

Horizon
Horizon Depth
Ex Al
mg/kg
Ex Ac
meq/100g
Field
pF 2.5
Wilting Point
pF4.2
g/100g
Coarse Sand
(0.2-2.0mm)
%
Fine Sand
(0.02-0.2mm)
%
Silt
(0.002-0.02mm)
%
Clay
(<0.002mm)
%
A1
0-20
7.3
22
37
16
22
A2
20-35
B21
35-60
8
1.4
5
3
87
B22
60-100
7.9
1.1
4
3
89
B23
100-130+
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