SW68

Location: Narangrook West

Australian Soil Classification: Bleached-Mottled, Eutrophic, Brown CHROMOSOL (very thick loamy surface horizons)

General Landscape Description: Gently inclined undulating rises.
Site Description: Crest.
Geology: Hanson Plain Sand

SW68 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-10 cm	Dark grayish brown (10YR4/2 moist), light brownish gray (10YR6/2 dry); sandy loam; apedal; very weak consistence; pH 5.2:	SW68 Profile. Note: Surface (A1) horizon has been stripped from the soil profile.
A21eg	10-60 cm	Very pale brown (10YR7/4 moist), light gray (10YR7/2 dry); sandy loam; abrupt smooth change to:
A22ce	60-80 cm	Very many (80%) irregular rounded coarse (10-30 mm) ferromanganiferous nodules in a very pale brown (10YR7/4 moist), light gray (10YR7/2 dry) sandy loam matrix:
A3	80-90 cm	Yellow/gray mottled; coarse sandy loam with fine distinct red mottles, clear change to:
Subsoil
B21tg	90-150 cm	Mottled brown (7.5YR4/4 moist) (50%) and strong brown (7.5YR5/8 moist) (50%); tough heavy clay; firm (moist) consistence; pH 6.2:
B22tg	150-220/230 cm	Brown (7.5YR4/6 moist) and strong brown (7.5YR5/6 moist) and dark brown (7.5YR3/2 moist) and gray (7.5YR5/1) coatings on ped faces; heavy clay; firm (moist) consistence; pH 6.0; abrupt change to:
C	220/230 cm+	Hanson Plain Sand; red and yellow mottled weekly cemented coarse sand, diggable with spade; very many (80%) irregular rounded coarse (10-30 mm) ferromanganiferous nodules in a very pale brown (10YR7/4 moist), light gray (10YR7/2 dry) sandy loam matrix.

• Very thick conspicuously bleached subsurface (A2) horizon.
• Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Strongly Acid	Very Low	Non-Sodic	None
Subsoil (B21 horizon)	Slightly Acid	Very Low	Non-Sodic	None
Deeper subsoil (at 150 - 220 cm)	Moderately Acid	Very Low	Non-Sodic	None

The surface is strongly acid. The subsoil is slightly acid becoming moderately acid with depth

Salinity rating is very low throughout the profile.

The soil is non sodic throughout.

Clay levels jump markedly at the surface / subsoil boundary.

Horizon	Sampling Depth (cm)	pH (water)	pH (CaCl2)	EC 1:5	Organic Carbon %	Nitrogen %	Exchangeable Cations
							Ca	Mg	K	Na
							meq/100g
A1	0-10	5.2	4.5	0.13	3.6	0.23	3.2	0.57	0.31	0.22
B21g	100-120	6.2	5.7	0.08			3.3	9.7	0.15	0.43
B22g	170-190	6	5.6	0.08			1.9	11	0.14	0.62

Notes:

• Flat on top of hill, which rises again to the West. Soils becoming moderately/ weakly vertic in concavity of upper slope unit. Soils moderately vertic and very dark in parts, on way to McNabbs Rd, with structure and colour similar to soils on the Dilwyn and Moorabool Viaduct.