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SW62

Location: SimpsonAustralian Soil Classification: Humose-Acidic, Tenosolic, Redoxic HYDROSOL (thick, non-gravelly, sandy, deep)
General Landscape Description: Gently undulating plainSite Description:Broad (50-100 m) flat to slightly concave element between two shallow drainage lines
Geology: Hanson Plain Sand

South West Gasp Pipeline GP62 Landscape
SW62 Landscape


Soil Profile Morphology:


Surface Soil


A10-40 cmBlack (10YR2/1 moist, 10YR4/1 dry); loamy fine sand; massive firm consistence; pH 4.3; gradual and wavy change to:
South West Gasp Pipeline GP62 Profile
SW62 Profile
A2g40 cm+ Very dark greyish brown (10YR3/2 moist and 10YR5/2 dry), becoming mottled with depth (90 cm+); loamy fine sand; massive firm consistence; pH 4.7.

Key Profile Features:

Soil Profile Characteristics:

pH
Salinity Rating
Sodicity
Dispersion
Surface
(A1 horizon)
Extremely Acid
Low
Non-Sodic
-
Subsurface
(A2) horizon)
Very Strongly Acid
Low
Non-Sodic
-

South West Gasp Pipeline GP62 pHSouth West Gasp Pipeline GP62 SalinitySouth West Gasp Pipeline GP62 Clay

South West Gasp Pipeline GP62 Coarse Sand

South West Gasp Pipeline GP62 Exchangeable Aluminium

Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-40
4.3
3.4
0.13
0.35
0.53
0.09
0.62
A2g
40+
4.7
4
<0.05
<0.05
0.09
<0.05
0.1

Horizon
Horizon Depth
(cm)
Ex Al
mg/kg
Ex Ac
meq/100g
Field
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)
A1
0-40
230
18
19
49
23
5
A2g
40+
110
5.9
28
47
19
6


Management Considerations:

Whole Profile

  • The soil profile is likely to be saturated for a number of months during most years.

Surface (A) Horizons
  • Exchangeable aluminium levels are high in the extremely acid surface soil. This will restrict the growth of aluminium sensitive species. High levels of aluminium will also tend to “fix” phosphorus and make it less available to plants (and therefore reduce the effectiveness of applied P fertilisers). Raising the pH level of the soil by liming will help reduce the level of exchangeable aluminium. A lime test (sampled across the whole paddock) may be appropriate to determine the amount of lime needed to raise pH. Other factors need to be considered, however, before lime is recommended (e.g. species growth, method of application, trial response, likely cost benefit).
  • Manganese toxicity can occur in strongly acid soils, especially when waterlogging occurs. Raising the pH by lime application will assist in reducing any manganese toxicity.


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