SW70

Location: Tulloh

Australian Soil Classification: Humose, Sesquic, Semiaquic PODOSOL

General Landscape Description: Undulating low hills
Site Description: Waxing upper slope
Geology: Ambiguous: Hanson Plain Sand, Dilwyn Formation (Colac 1:250 000), or Eastern View Formation (Colac 1:50 000)

SW70 Landscape

Soil Profile Morphology:

Surface Soil

Ap	0-20/30 cm	Very dark grayish brown (10YR3/2 moist), grayish brown (10YR5/2 dry); loamy sand; apedal; pH 5.3; diffuse change to:	SW70 Profile. Note: Surface (A1) horizon has been stripped from the soil profile
A2	20/30-90/110 cm	Grayish brown (10YR5/2 moist), conspicuously bleached (10YR7/2 dry); sand; sporadic gravel band (>100 mm); with very many medium to coarse (5-15 mm) nodules with dark manganiferous centres; very weak to weak consistence; pH 5.4; abrupt change to:
Subsoil
B21s	90/110-150 cm	Brown (7.5YR4/4 moist and dry) and brownish yellow (10YR6/8 moist) to yellow (10YR7/8 dry); sandy clay loam; cemented sand "coffee rock"; massive; firm to strong consistence; clear change to:
B22g	150-200 cm	Yellowish brown (10YR5/8 moist) (50%) and light greenish gray (5GY7/1 moist) (50%); very dark grayish brown (10YR3/2 moist) coatings; sandy light clay; pH 6; clear change to:
B23	200+ cm	Mottled yellowish brown (10YR5/8 moist) (30%) and light greenish gray (5GY7/1 moist) (70%); apedal.

• Very thick conspicuously bleached subsurface (A2) horizon.

	pH	Salinity Rating	Sodicity	Dispersion
Surface (Ap horizon)	Strongly Acid	Moderate	Non-Sodic	None
Subsoil (A2 horizon)	Strongly Acid	Very Low	Non-Sodic	None
Deeper Subsoil (100+ cm)	Moderately Acid	Very Low	Non-Sodic	None

The surface and upper subsoil is strongly acid. The deeper subsoil is moderately acid.

Salinity rating is moderate in the surface becoming very low in the subsoil.

The soil is non sodic throughout.

The clay content is quite low throughout the profile.

Horizon	Sample Depth (cm)	pH (water)	pH (CaCl2)	EC 1:5	Nitrogen %	Organic Carbon %	Exchangeable Cations
							Ca	Mg	K	Na
							meq/100g
Ap	0-10	5.3	4.6	0.25	0.31	3.2	2	1.1	0.44	0.72
A2	30-50	5.4	4.6	0.07			0.27	0.13	<0.05	0.18
B21s	100+	5.8	4.9	0.08			1.3	1.9	0.09	0.33

Management Considerations:

Notes

• The area is mapped as Tad and Klp but there are great similarities between Tpb and some of the soil profiles. This question needs to be resolved, particularly the Fe sandstone/Fe gravel/Fe colluvial content. Area between creeks is mapped as Klp but soil is same as that East of Christies-Colac Road. General trend is for gravel to disappear from the A2 on these slopes here and for the subsoil structure to become larger, A2/B more variable, more gleyed and strong vertic features.