OTR415

Australian Soil Classification: Ceteric, Regolithic, Shelly CALCAROSOL

General Landscape Description: Steeply Rolling Dunes
Site Description: Dune - Upper Slope Slope: 5% Aspect: Westerly
Native Vegetation: Scrub; Themeda australis [Dactylis glomerata}
Geology: Qpb: Quaternary coastal dune deposits; calcarenite, aeolian sands

OTR415 Landscape

Soil Profile Morphology:

Surface Soil

A1	0-15 cm	Black (10YR2/1); sandy loam; apedal single grain structure; clear boundary to:
Subsoil
B2	15-75 cm	Black (10YR2/1); loamy sand; very weak coarse subangular blocky structure; pH 8.4; gradual boundary to:
C	75+ cm	Pale brown (10YR6/3); coarse sand; apedal single grain structure.

	pH	Salinity Rating	Sodicity
Surface (A1 horizon)	Moderately Alkaline	Very Low	Non-Sodic
Subsoil (B21 horizon)	Moderately Alkaline	Low	Non-Sodic
Deeper Subsoil (at 150 cm)	Very Strongly Alkaline	Low	Non-Sodic

The surface and upper subsoil is moderately alkaline. The deeper subsoil is very strongly alkaline.

The salinity rating in the surface is very low. The subsoil has a low salinity rating.

Very low clay content that decreases with depth.

Horizon	Horizon Depth (cm)	pH (water)	EC dS/m	Cl %	Organic Carbon %	Total N %	P ppm	K ppm	Exchangeable Cations				Total Bases cmolc/kg	Ex Ac cmolc/kg	CEC cmolc/kg
									Ca	Mg	K	Na
									cmolc/kg
A1	0-8	7.9	0.27	0.025	5.1	0.43	16	100	35.9	3.6	0.3	0.2	40.0	0	19.3
A1	8-15	8.0	0.23	0.023	4.1	0.37	14	100
	15-30	8.3	0.19	0.22	2.5	0.24	9	70
B2	30-60	8.4	0.23	0.023	1.6	0.15	5	60	24.6	1.0	0.2	0.1	25.9	0	4.4
	60-76	8.6	0.13	0.008	0.8	0.069	3	20
	91-122	9.0	0.09	0.003	0.1	0.008	4	20
C	150-180	9.1	0.09	0.003	0.1	0.006	3	20	1.4	<0.05	<0.05	<0.05		0

Horizon	Horizon Depth (cm)	Gravel %	Coarse Sand (0.2-2.0 mm)	Fine Sand (0.02-0.2 mm)	Silt (0.002-0.02 mm)	Clay (<0.002 mm)
A1	0-8	0	53	28	4	8
A1	8-15	0
	15-30	0
B2	30-60	0	63	25	3	8
	60-76	tr.
	90-120	tr.
C	150-180	tr.	85	12	1	2

• Gradational soil profiles allows water and gas (air) to move without physical limitations but remains dependent on any chemical or depth restrictions.
• Deep sandy soils generally have poor plant water/nutrient holding capacities. These soils may be hydrophobic (in conjunction with organic coatings) when dried out, taking time to reabsorb moisture. These soils do however drain rapidly.