Site SW64

Location: Simpson.	Australian 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

A11	0-40/45 cm	Black (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:	Site SW64 profile
A12	45-55/60 cm	Greyish 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) with light yellowish brown (2.5Y6/3) mottles; clayey sand; apedal; firm consistence; pH 4.8; gradual change to:
B22g	120 cm+	Light brownish grey (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	-

• Soil profile is 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.

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