Guidelines for the Specification of Quality Compost for use in ... - Wrap
Guidelines for the Specification of Quality Compost for use in ... - Wrap
Guidelines for the Specification of Quality Compost for use in ... - Wrap
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<strong>Guidel<strong>in</strong>es</strong> <strong>for</strong> <strong>the</strong> <strong>Specification</strong> <strong>of</strong> <strong>Quality</strong> <strong>Compost</strong> <strong>for</strong> <strong>use</strong> <strong>in</strong> Grow<strong>in</strong>g Media 12<br />
7.0 Additional <strong>in</strong><strong>for</strong>mation<br />
The follow<strong>in</strong>g additional data may be required by <strong>the</strong> end <strong>use</strong>r:<br />
Nitrate level:<br />
NO3-N (nitrate-N) level <strong>in</strong> water extract accord<strong>in</strong>g to BS EN 13652.<br />
Nutrient content:<br />
Water and CAT extractable nutrient concentrations <strong>for</strong> iron (Fe), magnesium (Mg), phosphorus<br />
(P) and potassium (K). Water extraction can underestimate <strong>the</strong> levels <strong>of</strong> <strong>the</strong>se nutrients that<br />
can be provided by composts. These are determ<strong>in</strong>ed by BS EN 13652 and 13651 respectively<br />
and expressed <strong>in</strong> mg/l (as received).<br />
Lim<strong>in</strong>g potential:<br />
The lim<strong>in</strong>g potential (neutralis<strong>in</strong>g value) <strong>of</strong> <strong>the</strong> material, expressed as a percentage <strong>of</strong> <strong>the</strong> dry<br />
matter <strong>in</strong> terms <strong>of</strong> calcium carbonate equivalent. This will assist a grow<strong>in</strong>g media <strong>for</strong>mulator<br />
to assess by how much limestone can be reduced to compensate <strong>for</strong> <strong>the</strong> acidity <strong>of</strong> any o<strong>the</strong>r<br />
components such as peat or bark.<br />
‘F<strong>in</strong>es’ content:<br />
The percentage by weight <strong>of</strong> particles < 1 mm (‘f<strong>in</strong>es’) on a dry matter basis us<strong>in</strong>g <strong>the</strong> sieve<br />
test described <strong>in</strong> PAS 100:2011.
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