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SW64

Location: SimpsonAustralian Soil Classification: Humose-Acidic, Kandosolic, Redoxic HYDROSOL
General Landscape Description: Gently undulating plain (plateau)Site Description: Gentle slope between plateau and depression
Geology: Hanson Plain Sand


Soil Profile Morphology:

Surface Soil


A110-40/45 cmBlack (2.5Y2.5/1), grey (2.5Y6/1 dry) to light yellowish brown (2.5Y6/4 dry); light fine sandy loam; weakly pedal, very weak consistence; moderate amount of roots present; pH 5.1; clear change to:
South West Gasp Pipeline GP64 Profile
SW64 Profile
A1245-55/60 cmGreyish brown (2.5Y5/2 moist and dry); loamy sand; apedal; firm consistence; diffuse change to:
Subsoil

B21g55/60-120 cmYellowish brown (10YR5/8) and light yellowish brown (2.5Y6/3) mottled; clayey sand; apedal; firm consistence; pH 4.8; gradual change to:
B22g120 cm+Light brownish grey (10YR6/2) with very coarse prominent yellowish brown (10YR5/6 and 5/8) mottles; clayey sand; apedal.

Key Profile Features:
  • Thick organic matter rich surface (A1) horizon.

Soil Profile Characteristics:

pH
Salinity Rating
Sodicity
Dispersion
Surface
(A1 horizon)
Strongly Acid
Low
Non-Sodic
-
Subsoil
(B21 horizon)
Very Strongly Acid
Low
Non-Sodic
-

South West Gasp Pipeline GP64 Graphs
Horizon
Horizon Depth
(cm)
pH
(water)
pH
(CaCl2)
EC
1:5
NaCl
%
Exchangeable Cations
Ca
Mg
K
Na
meq/100g
A1
0-40
5.1
4.5
0.26
2.3
0.5
0.5
0.3
B21g
55-120
4.8
4.2
0.06
0.09
0.54
<0.05
0.18
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
17
16
37
38.4
10
4.5
B21g
55-120
150
5.7
27.7
41.6
11.5
20.5


Management Considerations:

Whole Profile

  • Soil profile likely to be saturated for a number of months during most years.

Surface (A) Horizons
  • Manganese toxicity can occur in strongly acid soils, especially when waterlogging occurs. Raising pH by lime application will assist in reducing manganese toxicity.

Notes:
  • B21 and B22 horizons are saturated especially at the base of profile. Water is moving from surrounding soil into trench as water would not pool this high in trench. Bottom of trench has turned “quick” or liquid where water has been allowed to sit for a period of time. Therefore low clay content allowing water to move through profile, even where trencher has not dug. Whole profile very sandy, with slight increase in clay content further down.


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