PVI 5

Site: PVI 5	Land Unit: Buckley Swamp Peats
*Aust. Soil Class.:* Terric, Basic, Sapric ORGANOSOL (confidence level 1)

General Land Unit Description:
Buckley Swamp consists of a valley infilled by an earlier lava flow, with the subsequent blockage of the drainage line resulting in peat accumulation. The area has been drained and burnt at various times in the past, resulting in some decomposition and loss of peat. The dominant soils of the plain are Organosols with massive or well-structured surfaces. The soils of the backplain are commonly Hydrosols with well structured surfaces and peaty horizons. There are also minor occurrences of Vertosols.

Site Description:

Geology: Quaternary basalt overlain by alluvials	Landform pattern: Flood plain
Position in landscape: Drainage depression	Internal drainage: Imperfectly drained

Soil Profile Morphology

A1	0-20 cm	Black (10YR2/1), loam, weak coarse blocky structure, very weak consistence (dry), pH 5.8. Clear change to:
	Subsoil
B21	20-30 cm	Black (10YR2/1), fine sandy clay loam (organic), strong medium polyhedral, parting to strong fine to very fine polyhedral structure, very firm consistence (dry), pH 5.8. Sharp change to:
P21	30-45 cm	Very pale brown (10YR7/3), laminated sapric peat. Sharp change to:
P22	45-60 cm	Very dark grey (10YR3/1), clayey peat. Sharp change to:
D1	60-70 cm	Grey (5Y5/1), medium clay, pH 7.0. Clear change to:
D2	70-80 cm	Grey (5Y6/1) with yellow (5Y7/6) mottles, sandy clay. Sharp change to:
D3	80+ cm	Pale olive (5Y6/4), sandy clay loam, pH 8.0, rusty root channel mottling.

Key Profile Features

Very high organic matter levels in upper soil profile

Soil Profile Characteristics

	pH	Salinity Rating	Sodicity	Dispersion
Surface soil (A1 horizon)	Moderately Acid	Low	Non-Sodic	None
Upper subsoil (20-30 cm)	Moderately Acid	Low	Non-Sodic	None
Deeper subsoil (at 60-70 cm)	Moderately Alkaline	HIgh	Non-Sodic	-

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 (0.02-0.2mm)	Fine Sand (0.02-0.2mm)	Silt (0.02-0.02mm)	Clay (<0.002mm)	Total Carbon (% w/w)
						Ca	Mg	K	Na
						meq/100g
A1	0-20	5.8	5.6	0.21		32	16	0.27	1.3	23	30	72.6	52.6	39.3	8.7	12	18	23
B21	20-30	5.8	5.7	0.25		39	22	0.72	1.7	28	31	76.7	63.7	7.4	36.8	6	46.5	28
P21	30-45	Peat Layers
P22	45-60	Peat Layers
D1	60-70	7.0	6.0	0.20		9.8	12	0.43	1.2					7.4	36.8	6	46.5
D3	80+	8.0	7.6	0.81										.1	21	17.5	50

Site PVI 5a - Paralithic, Basic, Sapric ORGANOSOL
Note: In some areas of the paddock the weathered
basalt occurs within 50 cm of the soil surface.

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