Compost Analysis The compost produced by Birch Airfield Composting Services has the following specification: Particle Size Distribution (sieve analysis) | 100% passing at a 12.0 mm screen
>90% passing at a 4.0 mm screen
>50% passing at a 1.0 mm screen | Bulk density | 638 kg/m3 | Moisture content | 30% | Dry matter | 70% | Organic matter (as Loss On Ignition) | 25% of the dry matter | Carbon: Nitrogen ratio | 6:1 | pH | 8 | Electrical conductivity | 400mS/cm | Purity | Substantially free of physical contaminants, viable weed seeds and pathogens | Potentially toxic elements ("heavy metals") | Within acceptable limits (as shown below) |
| Nutrients | As received basis | mg/litre, mg/kg, g/kg | Nitrogen as N | 11.9 g/kg | Phosphorous as P | 2310 mg/kg | Potassium as K | 9260 mg/kg | Calcium as Ca | 38.1mg/l | Magnesium as Mg | 2390 mg/kg | Sulphur as S | 1740 mg/kg | Iron as Fe | 14.12 mg/l |
| Heavy Metals | Lead | 138 mg/kg | Nickel | 13.3 mg/kg | Cadmium | 0.46 mg/kg | Mercury | 0.12 mg/kg | Arsenic | 7.28 mg/kg |
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