PVI 3

Site: PVI 3	Land Unit: Monivae Basalt
*Aust. Soil Class.:* Ferric, Eutrophic, Brown CHROMOSOL (thick, clay loamy surface) (confidence level 1)

General Land Unit Description:
The level to gently undulating basalt plains between Branxholm and Glenthompson consist of an association of Vertic or Ferric Brown Chromosols and Ferric Brown Sodosols. The Chromosols typically occur on the upper slopes and crests of very slight rises that may have scattered surface boulders, and Sodosols on the lower slopes and depressions. Sodosols or Vertosols, occasionally with a sporadic bleached subsurface horizon, are usually found in open depressions or drainage lines.

Site Description:

Geology: Quaternary basalt	Landform pattern: Level to gently undulating plain
Position in landscape: Midslope of low rise	Internal drainage: Moderately well drained

Soil Profile Morphology

A1	0-15 cm	Dark brown (10YR3/3), very fine sandy clay loam, weak coarse blocky structure, weak consistence (dry), pH 5.6. Clear change to:
A21	15-30 cm	Dark brown (10YR3/3), sporadically bleached, very fine sandy clay loam, firm consistence (dry), many (40%) ferruginous nodules, pH 6.3. Clear change to:
A22	30-40 cm	Clay loam (very fine sandy), massive, very firm consistence (dry), very many (60%) ferruginous nodules, pH 6.6. Clear change to:
	Subsoil
B21	40-65 cm	Yellowish brown (10YR5/6) with many (40%) brownish yellow (10YR6/8) and yellowish red (5YR5/8) mottles, light medium clay, weak medium prismatic, parting to strong coarse to medium blocky structure, strong consistence (dry), very many (60%) ferruginous nodules (2-10 mm), few (5%) ferruginous basalt fragments (5-8 mm), some manganese staining, pH 6.8. Gradual change to:
B22	65-120 cm	Yellowish brown (10YR5/4) with many (40%) strong brown (7.5YR5/8) and yellowish red (5YR5/8) mottles, light medium clay, weak medium prismatic, parting to strong coarse to medium to fine blocky structure, few (5%) ferruginous basalt fragments, strong consistence (dry), pH 6.5. Gradual change to:
B23	120+ cm	Yellowish brown (10YR5/4) with light grey (10YR7/1), reddish yellow (7.5YR6/8) and dark red (2.5YR4/8) mottles, medium heavy clay, firm consistence (moist), pH 6.5.

Key Profile Features

Strong texture contrast between surface (A) horizons and subsoil (B21) horizon
Large amount of ferruginous nodules in subsurface (A2) horizon

Soil Profile Characteristics

	pH	Salinity Rating	Sodicity	Dispersion
Surface soil (A1 horizon)	Moderately Acid	Low	Non-Sodic	None
Upper subsoil (40-65 cm)	Slightly Acid	Low	Non-Sodic	None
Deeper subsoil (at 120 cm)	Slightly Acid	Low	Non-Sodic	None

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)
						Ca	Mg	K	Na
						meq/100g
A1	0-15	5.6	4.3	0.07		4.8	2.4	0.14	0.27	12		35.1	13.1	4.3	39.6	25.5	25.0
A2	15-30	6.3	5.0	0.06		3.8	2.6	0.11	0.37	<10		27.8	10.5	14.2	37.0	19.5	15.5
A22	30-40	6.6	5.4	0.07		4.9	3.9	0.13	0.52			27.4	13.0	20.2	28.2	14.5	33.5
B21	40-65	6.8	5.7	0.12		5.5	6.5	0.22	1.0		9.3	41.9	24.5	7.6	16.3	10.0	65.5
B22	65-120	6.5	5.8	0.14		5.2	7.2	0.20	1.3		9.9	46.6	27.0	7.4	15.6	9.0	66.5
B23	120+	6.5	6.2	0.17		3.9	6.9	0.14	1.5

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