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SUPERSEDEDApproved Plan OPW22-0123
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Log in to see the plans as drawn On Grade Soil Media – Gardens
Quality – Soil must be free from any ‘unwanted materials’
Physical properties particle sizes
Property Units Target Range
Texture, preferred range n/a Sandy loam to clay loam
(OM) Organic matter content % dwb (dry Medium Organic Range 10 -15%
weight
basis)
Permeability mm/hour > 20 (@ 32 drops by McIntyre Jakobsen)
Wettability (AS4419) mm/min >5
Dispensability in water 1 or 2 (AS 4419 Category)
Large particles (naturally occurring)
2 – 20mm % w/w < 20
> 20mm % w/w < 10
Visible contaminants > 2mm (glass, % w/w < 0.5
plastic and metal
Chemical properties
Property Units Target Range
pH in water (1:5) standard range pH units 5.4 – 6.8
pH in CaCl2 (1:5) standard range pH units 5.2 – 6.5
pH in CaCl2 (1:5) alkaline range pH units 6.8 – 8.0
pH in CaCl2 (1:5) alkaline range pH units 6.5 – 7.5
Electrical conductivity (1:5) (EC) dS/m < 0.75
Phosphorus – P-tolerant / standard mg/kg 30 - 100
plants
Phosphorus for P-sensitive plants, mg/kg < 20
alkaline soil methods 9B1 or 9C1
Sodium (NA) % of eCEC <7%
Potassium (K) % of eCEC 3 – 15 %
Calcium (Ca) method 18F1 (or 15A1 % of eCEC 50 - 80
in alkaline soils)
Exchangeable magnesium (Mg) % of eCEC 10 - 30
Exchangeable aluminium (Al) % of eCEC <5
Exchangeable Ca/Mg ratio w/w 3-9
Available iron (Fe) mg/kg 100 - 400
Available manganese (Mn) mg/kg 25 - 100
Available zinc (Zn) mg/kg 5 - 30
Available copper (Cu) mg/kg 1 - 15
Available boron (B) mg/kg 0.5 - 5
Available nitrogen (nitrate N + mg/kg > 20
ammonium N)
URBIS
URB -P0003847-001-SP PAGE 15
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