EGW119

Location: Orbost South

Australian Soil Classification: Melanic, Eutrophic, Black DERMOSOL

Map Unit: River flats (rf)
Previous Site Name: EG119

General Landscape Description: Alluvial plain
Site description: Level plain >1% slope
Land Use: Grazing
Native Vegetation: Riparian forest
Geology: Recent sediments



Soil Profile Morphology:

Surface soil
A11	0 – 30 cm	Very dark greyish brown (10YR3/2); clay loam, (high in organic matter); strong medium polyhedral structure; weak consistence moderately moist; pH 6.1; gradual change to:
A12	30 – 70cm	Dark greyish brown (10YR4/2) distinctly mottled with fine common dark brown (7.5YR3/4) mottles ; fine sandy clay loam; moderate medium polyhedral structure; weak consistence moist; pH 6.4; clear change to:
Subsoil
D	70 – 110cm	Very dark grey (10YR3/1); silty clay loam; weak to moderate coarse prismatic structure; firm consistence moderately moist; pH 5.5.

• Uniform textures throughout.

Horizon	Horizon Depth (cm)	pH (water)	pH (CaCl2)	EC dS/m	Organic Carbon %	Total Nitrogen %	Exchangeable Aluminium ppm	Exchangeable Acididty meq/100g	Exchangeable Cations				Coarse Sand (0.2-2.0 mm) %	Fine Sand (0.02-0.2 mm) %	Silt (0.002-0.02 mm) %	Clay (<0.002 mm) %	Field Capacity % w/w	Wilting Point % w/w
									Ca	Mg	K	Na
									meq/100g
A1	0-30	6.1	5.2	0.09	2.2	0.24	11	12.0	8.1	5.5	0.5	0.53	0	32	39	25	35.2	20.3
A12	30-70	6.4	5.5	0.08			11	9.2	8.5	5.9	0.21	0.56	0	44	26	22	30.7	14.1
D	70-110	5.5	4.7	0.13			42	16.0	4.6	4.0	0.22	0.62	1	40	26	25

• The plant available water content of this soil is moderate (65 mm based a rooting depth of 70 cm).

• The deep surface soil is well structured
• Infiltration of water into the well structured surface soil would be quite high. This horizon is also very well drained
• The nutrient holding capacity of the soil is high (based on the sum of the exchangeable cations)
• Potassium levels are moderate to high and any response to potassium fertilizer is unlikely
• The soil is slightly acid and unlikely to respond to lime.