Composts

Composts can be made from most biodegradable materials, and could derive from many unusual sources. If it originates from municipal solid waste, however, care should be taken that no toxic and non-degradable materials remain after the supplier's separation processes. Small pieces of brick and concrete, glass and plastic (inerts), lead residues from old car batteries and cadmium from electroplated items are possible. A useful work on specifications and recommended chemical analyses of composts is the book by Bertoldi et al., 1987.

The analyses specifying the compost include:

ammoniacal nitrogen

nitrate-nitrogen

calcium

nitrogen

carbon

organic matter (ignition 450-600°C)

C:N ratio

particle size

conductivity

pH

heavy metals

phosphorus

inerts

potassium

magnesium

total solids

moisture

Organic Gardeners Composting

Organic Gardeners Composting

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