Victorian Resources Online (archived)

LWA3

Location: Walpeup	Australian Soil Classification: Epibasic, Pedal, Hypercalcic CALCAROSOL
General Landscape Description: Swale between east-west dunes	Site Description: Landcare delivery site
Geology: Quaternary aeolian deposits (Woorinen Formation)

LWA3 Landscape

Soil Profile Morphology:

Surface Soil

A11	0-6 cm	Dark brown (7.5YR3/4); loamy sand; loose; pH 7.5; clear change to:	LWA3 Profile
A12	6-10 cm	Brown (7.5YR384); loamy sand; loose; weak consistence (dry); pH 6.8; clear change to:
A13	10-14 cm	Dark brown (7.5YR3/4); sandy loam (clayey); firm to very firm consistence (dry); some compaction; pH 7.2; sharp change to:
A2	14-28 cm	Reddish brown (5YR4/4); sandy loam (clayey); firm to very firm consistence (dry); hard surface; pH 7.8; slightly calcareous; abrupt change to:
Subsoil
B1	28-35 cm	Yellowish red (5YR4/6); sandy clay loam; weak to moderate coarse to medium (10-50 mm) blocky; macropores present; pH 8.7; gradual change to:
B21	35-50 cm	Red (2.5YR4/6); light clay (sandy); weak coarse (50-100 mm) prismatic, parting to moderate to strong coarse (20-50 mm), and moderate to strong medium to fine (5-20 mm) subangular blocky structure; firm consistence (slightly moist); pH 9.3; gradual change to:
B22	50-65 cm	Yellowish red (5YR4/6); light clay (sandy); moderate strong to medium (10-50 mm) subangular blocky structure; strong consistence (dry); few (5%) soft carbonate nodules; pH 9.5; gradual change to:
B23k	65-100 cm	Yellowish red (5YR5/6); light medium clay (sandy); weak to moderate strong to medium (10-50 mm), parting to moderate fine (5-10 mm) subangular blocky structure; very many (40%) fine earth carbonates and carbonate/silica nodules (5-20 cm); pH 9.8; gradual change to;
B24k	100-140+ cm	Weak to moderate coarse (20-50 mm) subangular blocky, parting to weak to moderate medium to fine (5-20 mm) subangular blocky structure; many (20%) fine-earth carbonates and semi-hard calcareous nodules; pH 9.8.

Key Profile Features:

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface (Ap horizon)	Slightly alkaline	Low	Non-sodic	None
Subsoil (B21 horizon)	Very strongly alkaline	Medium	Strongly sodic	Moderate¹
Deeper subsoil (at cm)	Extremely alkaline	High	Strongly sodic	Complete

Strong dispersion after remoulding.

Horizon	Horizon Depth	pH (water)	pH CaCl²	EC 1:5	Org. Carbon mg/kg	Exchangeable Cations
						Ca	Mg	K	Na
						Meq/100g
A11	0-6	7.5	7.2	0.18	0.77	4.2	1.2	1.1	0.2
A12	6-10	6.8	6.4	0.08	0.43	3.9	1.1	1.1	0.2
A13	10-14	7.2	6.7	0.08	0.38	5.4	1.5	1.3	0.2
A2	14-28	7.8	7.2	0.07		4.6	1.2	0.8	0.2
B1	28-35	8.7	7.6	0.10		8.0	4.5	0.9	1.9
B21	35-50	9.3	8.5	0.42		7.1	9.6	1.3	6.0
B22	50-65	9.5	8.7	0.49
B23K	65-100	9.8	8.9	0.63
B24K	100-140	9.8	8.8	0.67

Horizon	Horizon Depth	Boron mg/kg	Field pF2.5 g/100g	Wilting Point pF4.2 g/100g	Coarse Sand (0.2-2.0mm) %	Fine Sand (0.02-0.2mm) %	Silt (0.002-0.02mm) %	Clay (<0.002mm) %


A11	0-6	0.9	8.6	2.4	55	34	5	6
A12	6-10	0.7	9.7	2.3	50	38	6	6
A13	10-14	0.9	11.6	3.3	51	33	7	8
A2	14-28	1.2	16.6	3.2	47	36	8	9
B1	28-35	1.6	21.6	7.6	43	25	9	20
B21	35-50	5.5	36.3	17.8	31	20	13	32
B22	50-65	11.0	37.4	18.3	32	18	11	31
B23K	65-100	19.0	35.2	19.3
B24K	100-140	< 0.3

Management Considerations:

Note:

Soil characterised by Mark Imhof Jan 07

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