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SFS7

Location: South Mokanger
Aust. Soil Class.:Eutrophic, Mottled-Subnatric, Grey SODOSOL

Image:  SFS 7 landscape
SFS 7

Soil Profile Morphology:

Surface Soil
Image:  SFS 7 profile
SFS 7
A10-5 cmBrown (10YR 4/3); fine sandy loam; apedal; weak surface seal; firm consistence; pH 5.6; abrupt change to:
A25-25/30 cmBrown (10YR 5/3 moist), conspicuously bleached (10YR 7/2 dry); sandy loam; rusty (10YR 4/6) root channel mottling; apedal; weak to firm consistence; pH 5.6; clear & wavy change to:
Subsoil
B2125/30-50 cmDark grey (10YR 4/1), with many (20-50%), fine yellowish brown (10YR 5/8) mottles; medium heavy clay; contains minor (1%) round buckshot; medium to coarse rough/irregular prismatic (40-80 mm), parting to rough blocky/polyhedral peds; pH 6.3; gradual change to:
B2250-80 cmOlive brown (2.5Y 4/3-5/3); with yellowish brown (10YR 5/8) mottles; medium heavy clay; apedal; massive; sticky; minor rounded buckshot (5-10 mm); pH 6.5; gradual change to:
B2380 cm+Light olive brown (2.5Y 5/3 moist); with faint light yellowish brown (2.5Y 6/4) mottles; medium heavy clay; apedal; massive; sticky; few (1-5%) buckshot, some fine (<5 mm), rounded quartz; pH 6.7.

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

Soil Profile Characteristics:


pH
Salinity Rating
Surface
(A1 horizon)
Moderately Acid
Low
Non-Sodic
None
Subsoil
(B21 horizon)
Slightly Acid
Low
Sodic
None1
Deeper subsoil
(at 1 m)
Slightly Acid
Low
Strongly Sodic
Strong-Complete
1 Strong dispersion after remoulding

Image:  SFS 7 graphs

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
dS/m
NaCl
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
Ap
5.6
4.9
0.15
3.5
1.4
0.24
0.38
A1
0-5
6.9
6.5
0.34
0.02
9.1
1.2
0.4
<0.1
A2
5-25/30
5.6
4.7
<0.05
0.77
0.49
0.07
0.11
B21
25/30-50
6.3
4.8
0.09
4.6
9.4
0.4
2
B22
50-80
6.5
5.1
0.14
4.5
12
0.44
3.5
B23
80+
6.7
5.7
0.23
4.2
12
0.36
4.6

Horizon
Horizon Depth
(cm)
Exchangeable Aluminium
mg/kg
Exchangeable Acidity
meq/100g
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)
Ap
<10
6
16.4
6.4
26.3
47.1
10
13
A1
0-5
4.7
19.8
10
23.9
45
11
13
A2
5-25/30
<10
1.9
12.6
2.2
30.2
49.7
12.5
8.5
B21
25/30-50
36
10
36.7
19.6
19
28.1
6.5
44
B22
50-80
10
42.4
22.3
14.7
26.4
6.5
49.5
B23
80+
7.1
38.6
19.8


Management Considerations:

Whole Profile

  • Plant available water capacity (PAWC) is considered to be low (estimated at 88 mm) in the upper 80 cm of this soil profile. Effective rooting depth (ERD) is restricted to 80 cm due to the highly sodic subsoils (ESP>20).
Notes
  • Raised beds 1998, canola. Dry winter, no difference between beds and conventional (2+t/ha). Pit excavated in conventionally cultivated part of paddock to west side of beds. Midslope, gently sloping, flat, northerly aspect.
  • Horizon Ap from a one year old raised bed which had been tilled once. Remaining horizons collected from undisturbed pasture.
  • Profile described by Richard MacEwan, May 1999.
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