# Regulation (EU) 2019/1009 of the European Parliament and of the Council of 5 June 2019 laying down rules on the making available on the market of EU fertilising products and amending Regulations (EC) No 1069/2009 and (EC) No 1107/2009 and repealing Regulation (EC) No 2003/2003 (Text with EEA relevance), Division 7: The requirements in this Annex are expressed in oxidised form for certain nutrients. Where compliance is assessed based on the presence of the nutrient in question in its elemental form, the following conversion factors shall be used:

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

phosphorus (P) phosphorus pentoxide (P2O5) × 0,436;
potassium (K) potassium oxide (K2O) × 0,830;
calcium (Ca) calcium oxide (CaO) × 0,715;
magnesium (Mg) magnesium oxide (MgO) × 0,603;
sodium (Na) sodium oxide (Na2O) × 0,742;
sulphur (S) sulphur trioxide (SO3) × 0,400.

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Source: https://www.legislation.gov.uk/eur/2019/1009/annex/I/part/II/division/7 (the official version)
Page: https://openlegislation.uk/eu-regulation-2019-1009/annex-I/part-II/division-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.