LSWW15

Yellow gum plains near Tallageira		Site Code	LSWW15	Hypercalcic, Mottled-Subnatric, Brown SODOSOL
		Location	Tallageira, western Victoria
		Landform	Plain
		Geology	Quaternary swamp and lake deposits: paludal silt and clay
		Element	Plain




Horizon	Depth (cm)	Description
A1	0–10	Very dark greyish brown (10YR3/2); loamy sand; weakly structured; firm consistence when dry; pH 7.8; abrupt boundary to:
A2	10–35	Light brown (7.5YR6/4); conspicuously bleached when dry; sand; massive (structureless); very firm consistence when dry; a few ferruginous nodules; pH 8.4; sharp boundary to:
B21	35–75	Yellowish brown (10YR5/4) with many coarse distinct red mottles; light medium clay; strong very coarse prismatic, parting to medium prismatic/coarse blocky, parting to moderate medium blocky structure; dark organic staining on the ped faces; strong consistence, dry (dispersive when worked); pH 5.8; clear boundary to:
B22	75–100	Light grey (2.5Y7/2) with yellowish red mottles; light medium clay, fine sandy; strong very coarse prismatic, parting to medium prismatic/coarse blocky, parting to moderate medium blocky structure; very firm consistence, slightly moist (dispersive when worked); pH 7.3; clear boundary to:
B23k	100–130	Light grey (2.5Y7/2) with strong brown mottles; sandy clay; very firm consistence when moderately moist; abundant soft (and a few hard) calcareous segregations; pH 8.9:
B3	130–180	Light grey (2.5Y7/2) with yellow mottles; sandy clay (becoming light sandy clay loam at depth); massive (structureless); firm consistence, moderately moist; pH 9.0:
BC	180–200+	Loamy sand; massive (structureless); weak consistence when moderately moist; pH 8.8.
Management Considerations
Strong texture contrast between topsoil and subsoil. Sandy, hydrophobic topsoil. Bleached A2 horizon with little nutrient capacity. Sodic mottled subsoil with prismatic structure. Dispersive subsoil following cultivation when wet. Acidic upper subsoil, becoming alkaline below with slight decrease in alkalinity at depth. Plant Available Water Capacity (PAWC) is considered to be medium (estimated at 140 mm) for this site profile based on an Effective Rooting Depth (ERD) of 100 cm. Rooting depth will be restricted by subsoil conditions, such as; strongly sodic (Exchangeable Sodium Percentage >20%), high soluble salt levels (Chloride >0.1%), poor structure (eg. massive or very coarse, columnar or Prismatic), very high. Top of the subsoil (B21) is acidic. Weathered sandstone occurs at 2m depth. Poor site drainage.

Horizon	Depth (cm)	pH (water)	pH (CaCl₂)	EC dS/m	Exchangeable Cations cmol-/kg				Wilting Point (pF 4.2)	Coarse Sand %	Fine Sand %	Silt %	Clay %
Horizon	Depth (cm)	pH (water)	pH (CaCl₂)	EC dS/m	Ca	Mg	K	Na	Wilting Point (pF 4.2)	Coarse Sand %	Fine Sand %	Silt %	Clay %
A1	0–10	7.8	7.3	0.16	15	2.6	0.5	0.4	13.1	25.4	48.8	8	8.5
A2	10–35	8.4	7.4	<0.05	0.8	<0.1	0.1	<0.1	0.8	44.2	44.5	6.5	4
B21	35–75	5.8	4.9	0.18	8.3	4.2	1.2	1.3	15.5	18.6	32.7	6	38.5
B22	75–100	7.3	6.5	0.17	11	5.2	0.8	1.2	14.0	19.3	39.2	6	31.5
B23k	100–130	8.9	8.1	0.29
B3	130–180	9	8.3	0.18
BC	180–200+	8.8	8.2	0.19

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