CRC16

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Location: Lexton
Aust. Soil Class.: Magnesic, Mottled-Mesonatric, Brown SODOSOL (thick, sandy surface horizon)

General Site Description: Remnant low-level terrace between scald and creek, with some aeolian influence
Site Description: Grazing paddock
Geology: Quaternary alluvial sediments

Photo: Landscape Photo Bet Bet soil pits 1, 2 and 3

CRC16 Landscape

Soil Profile Morphology:

Surface Soil			CRC16 Profile
A1	0-20 cm	Very dark grey (10YR3/1); light fine sandy loam; weak medium subangular blocky, parting to weak fine subangular blocky structure; very weak consistence (dry); very few (<2%) fine angular quartz fragments; rough ped faces; moderately hydrophobic; pH 6.1; clear and smooth change to:
A21	20-35 cm	Light yellowish brown (10YR6/4) conspicuously bleached (10YR7/3 dry); light fine sandy loam; massive; weak consistence (dry); earthy fabric; pH 4.9; sharp and wavy change to:
A22	35-45 cm	Pale brown (10YR6/3) conspicuously bleached (10YR8/2 dry); light fine sandy loam; massive; firm consistence (dry); very few (<2%) fine angular quartz fragments; earthy fabric; capping on prism tops; pH 5.1; sharp and wavy change to:
Subsoil
B1	45-60 cm	Strong brown (7.5YR5/6) with many medium faint pale brown (10YR6/3) and brown (7.5YR4/4) mottles; light sandy clay loam; moderate very coarse columnar structure; strong consistence (dry); very few (<2%) fine subangular quartz fragments; rough-ped fabric; pH 6.3; clear and smooth change to:
B21	60-80 cm	Brown (7.5YR4/4) with many (40%) medium distinct light yellowish brown (10YR6/4) mottles; light clay (fine sandy); moderate very coarse prismatic, parting to moderate coarse angular blocky structure; strong consistence (dry); very few (<2%) fine subangular quartz fragments; rough-ped fabric; pH 6.5; clear and smooth change to:
B22	80-105 cm	Light yellowish brown (10YR6/4) with many medium distinct brown (7.5YR4/4), light brownish grey (10YR6/2) and reddish yellow (7.5YR6/6) mottles; fine sandy clay loam; weak very coarse subangular blocky structure; strong consistence (dry); rough-faced peds; many very fine macropores present; pH 6.6; gradual and smooth change to:
B23	105-135 cm	Pale brown (10YR6/3) with many (40%) medium faint strong brown (7.5YR5/6) mottles; fine sandy clay loam; weak very coarse subangular blocky structure; very firm consistence (dry); rough-faced peds; many very fine macropores present; pH 7.2; clear and smooth change to:
2B21	135-160 cm	Grey (10YR6/1) with many (30%) medium distinct brown (7.5YR5/4) mottles; medium clay; weak very coarse subangular blocky, parting to weak medium subangular blocky structure; firm consistence (moderately moist); rough-faced peds; many very fine macropores present; pH 7.6; gradual and smooth change to:
2B22	160-180 cm	Light brownish grey (10YR6/1) with many (30%) coarse distinct reddish yellow (7.5YR6/6) mottles; silty clay loam; weak medium subangular blocky structure; weak consistence (moderately moist); smooth-faced peds; pH 7.5.

Key Profile Features:

Strong texture contrast between surface (A) horizons and subsoil (B21) horizon.
Columnar structure evident in parts of upper subsoil.

Soil Profile Characteristics:

	pH	Salinity Rating	Sodicity	Dispersion
Surface (A1 horizon)	Slightly Acid	Very Low	Non-Sodic	None
Subsoil (B21 horizon)	Slightly Acid	Very Low	Strongly Sodic	Strong-Complete
Deeper subsoil (at 160-180 cm)	Slightly Alkaline	Low-Medium	Strongly Sodic	Strong

Horizon	Horizon Depth	pH (water)	pH CaCl2	EC dS/m	NaCl %	Exchangeable Cations				Ex Al mg/kg	Ex Ac meq/100g	Field pF2.5	Wilting Point pF4.2	Coarse Sand (0.2-2.0mm)	Fine Sand (0.02-0.2mm)	Silt (0.002-0.02mm)	Clay (<0.002mm)
						Ca	Mg	K	Na
						meq/100g
A1	0-20	6.4	5.3	0.09		4.2	0.57	0.30	0.25	<10	8.7	18.0	6.5	14	67	12	2
A21	20-35	4.9	4.2	0.09		0.30	0.20	0.09	0.32	69	4.3	21.5	1.9	13	70	12	3
A22	35-45	5.1	4.3	0.06		0.11	0.12	0.05	0.23	43	1.9	19.0	5.3	12	71	13	3
B1	45-60	6.3	4.9	0.13		0.19	1.9	0.11	1.1	13	2.7	16.0	5.7	9	57	18	15
B21	60-80	6.5	4.9	0.23		0.33	7.0	0.26	3.4	13	6.3	28.5	1.9	4	39	17	38
B22	80-105	6.6	5.3	0.22		0.13	5.2	0.17	3.1	<10	3.7	24.0	9.8	3	58	16	22
B23	105-135	7.2	6.0	0.25		0.18	5.1	0.17	3.3		2.4			2	65	15	18
2B21	135-160	7.6	6.4	0.26	0.04	0.3	7.2	0.2	3.4					1	42	26	29
2B22	160-180	7.5	6.4	0.31	0.05	0.2	4.9	0.2	2.5					1	39	39	19

Notes:

Soil profile described by Mark Imhof, David Rees and Doug Crawford, (20/12/04).

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