# Commission Regulation (EC) No 1737/2006 of 7 November 2006 laying down detailed rules for the implementation of Regulation (EC) No 2152/2003 of the European Parliament and of the Council concerning monitoring of forests and environmental interactions in the Community, Division II.8: Chemical analyses

Extent: E+W+S+N.I.

Only the total element concentration is determined.
Each country is allowed to use its national methods. But it is necessary to certify the total element concentrations obtained by national methods with those certified on the reference standard samples. The foliage inventory will distinguish between mandatory and optional parameters (see list below)
Mandatory parameters
Optional parameters
Nitrogen (N)
Zinc (Zn)
Sulphur (S)
Manganese (Mn)
Phosphorus (P)
Iron (Fe)
Calcium (Ca)
Copper (Cu)
Magnesium (Mg)
Lead (Pb)
Potassium (K)
Boron (B)

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Source: https://www.legislation.gov.uk/eur/2006/1737/annex/I/chapter/3/division/II/division/II.8 (the official version)
Page: https://openlegislation.uk/eu-regulation-2006-1737/annex-I/chapter-3/division-II/division-II.8
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.