Compost

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spent mushroom compost, a bracken- or seaweed-based compost, agricultural
and food processing wastes etc., which might be put to agricultural
use. Composts are often very heterogeneous, which makes it difficult to prepare
a sufficiently homogeneous sample. The high humus content makes them
similar to peat soils, where organic matter can exceed 95%, which can affect
not only the analytical method, but also the interpretation of the results in
making fertilizer recommendations.
Typical specifications
Typical parameters and nutrient levels for assessment of compost quality are
shown in Table 5.2. These are combined values from a variety of sources,
including Bertoldi et al. (1987), and are merely intended to help in setting up
analytical procedures.
Some typical and preferred heavy and trace element concentrations for
soils and municipal composts are shown in Table 5.3. The levels in soils are
typical for dilute aqueous extractants such as 0.05 M EDTA, 0.5 M acetic
acid, ...

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must be consulted when formulating composts. For a summary
of compost standards in Canada, visit the Composting Council of Canada
website at:
http://www.compost.org/standard.html
The European Committee for Standardization (CEN) is harmonizing
European standards, and it is hoped their draft methods will eventually be
introduced as British Standard methods, coded BS EN.
For specifications of a typical commercial compost, visit:
http://www.asiagreen.com.my/chem_ana.htm and /chem_anb.htm
Apart from mandatory specifications, there are voluntary specifications,
which permit the compost manufacturer to use the validating scheme�s symbol.
In the UK, The Composting Association ...

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