SW64

Location: Simpson

Australian Soil Classification: Humose-Acidic, Kandosolic, Redoxic HYDROSOL

Site Description: Gentle simple slope between plateau and depression
General Landscape Description: Gently undulating plain (plateau)
Geology: Hanson Plain Sand

Soil Profile Morphology:

Surface Soil

A11	0-40/45 cm	Black (2.5Y2.5/1), gray (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:	SW64 Profile. Note: Surface (A1) horizon has been stripped from the soil profile.
A12	40/45-55/60 cm	Grayish brown (2.5Y5/2 moist and dry); loamy sand; apedal; firm consistence; diffuse change to:
Subsoil
B21g	55/60-120 cm	Yellowish brown (10YR5/8) and light yellowish brown (2.5Y6/3) mottled; clayey sand; apedal; firm consistence; pH 4.8; gradual change to:
B22g	120 cm+	Light brownish gray (10YR6/2) with very coarse prominent yellowish brown (10YR5/6 and 5/8) mottles; clayey sand; apedal.

• Thick organic matter rich surface (A1) horizon.

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Strongly Acid	Low	Non-Sodic	-
Subsoil (B21 horizon)	Very Strongly Acid	Low	Non-Sodic	None

The surface is strongly acid. The subsoil is very strongly acid.

Salinity rating is low throughout the profile.

The soil is non sodic throughout.

Exchangeable Aluminium levels are high in the subsoil.

Clay levels jump markedly at the surface / subsoil boundary.

Horizon	Sample Depth (cm)	pH (water)	pH (CaCl2)	EC 1:5	Organic Carbon %	Exchangeable Cations
						Ca	Mg	K	Na
						meq/100g
A1	0-40	5.1	4.5	0.26	7.7	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	Sample Depth (cm)	Ex Al mg/kg	Ex Ac meq/100g	Nitrogen %	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	0.46	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.

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

• 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.