IS31

Location: Vectis South


Australian Soil Classification: Calcic, Mesonatric, Yellow SODOSOL

Northcote Factual Key: Dy2.33
Great Soil Group: solodic soil
Soil Type: Haven Sandy Loam


General Landscape Description: Swale within a Dunefield.
Geology: Quaternary Lowan Formation: aeolian fine to medium grained dune sand

Soil Profile Morphology:

Surface Soil

A1	0-20 cm	Dark brown (10YR3/3); sandy loam; hardsetting surface condition; weak granular structure; firm consistence dry; pH 6.6; sharp boundary to:
Subsoil
B1	20-35 cm	Brownish yellow (10YR6/6) sporadically bleached (2.5Y7/4d); light medium clay; subplastic; massive structure with cemented capping; very strong consistence dry; pH 7.4; gradual boundary to:
B21	35-80 cm	Brownish yellow (10YR6/6); light medium clay; subplastic; weak blocky structure; strong consistence dry; slightly sticky consistence wet; very few (<2%) calcareous soft segregations; pH 8.5; gradual boundary to:
B22	80-100 cm	Yellow (10YR7/6) with yellowish red (5YR5/6) mottles; medium heavy clay; weak blocky structure; strong consistence dry; slightly sticky consistence wet; contains very few (<2%) calcareous nodule segregations; pH 9.2; sharp boundary to:
B3	100-120 cm	Brownish yellow (2.5Y7/4) with red (2.5YR4/8) mottles; sandy clay; weak blocky structure; strong consistence dry; slightly sticky consistence wet; contains very few (<2%) calcareous nodule segregations and sandstone fragments; pH 9.4.

Horizon	Sample Depth cm	pH H2O	EC dS/m	Sodium Chloride %	Exchangeable Calcium cmol-/kg	Exchangeable Magnesium cmol-/kg	Exchangeable Potassium cmol-/kg	Exchangeable Sodium cmol-/kg	Total Nitrogen %	Exchangeable Acidity cmol-/kg	Organic Carbon %	Permanent Wilting Point -1500okPa	Coarse Sand %	Fine Sand %	Silt %	Clay %
A1	0–20	6.6	0.11	0.01	1.9	1.6	0.2	0.3	0.09	2.9	1.0	4.6	51	34	4	9
B1	20–35	7.4	0.23	0.04	5.2	7.1	0.9	2.4	0.04	5	0.42	17.9	32	19	2	45
B21	35–80	8.5	0.51	0.05	5.2	9.6	1.5	3.1	0.03	2.7	0.23	21.1	28	17	3	52
B22	80–100	9.2	0.53	0.05	4.8	11.1	1.9	4.4	0.03		0.17	12.6	23	19	0	56
B3	100–120	9.4		0.05	3.8	8.7	1.5	3.8	0.01				23	12	0	42

• Strong texture contrast soil.
• Sandy surface soil with little structure, susceptible to wind and sheet erosion.
• Slightly acidic to neutral surface soil, low nutrient availability.
• Subsoil becomes highly alkaline with depth and clay decreases at depth.
• Subsoil is sodic, with sodium and magnesium levels increasing at depth, dispersion likely.
• Paler colours with red mottling indicate restrictive internal drainage but some oxidation present.
• Landform element, swale; very poor site drainage.