# Regulation (EC) No 2003/2003 of the European Parliament and of the Council of 13 October 2003 relating to fertilisers (Text with EEA relevance), Division D: Inorganic secondary nutrient fertilisers No Type designation Data on method of production and essential ingredients Minimum content of nutrients (percentage by weight)Data on the expression of nutrientsOther requirements Other data or type designation Nutrient content to be declaredForms and solubilities of the nutrientsOther criteria 1 2 3 4 5 6 1 Calcium sulphate Product of natural or industrial origin containing calcium sulphate at various degrees of hydration 25 % CaO 35 % SO3 Calcium and sulphur expressed as total CaO + SO3 Fineness of grind: at least 80 % to pass through a sieve with a 2 mm mesh width, at least 99 % to pass through a sieve with a 10 mm mesh width Usual trade names may be added Total sulphur trioxide Optional: total CaO 2 Calcium chloride solution Calcium chloride solution of industrial origin 12 % CaO Calcium expressed as water-soluble CaO Calcium oxide Optional: for plant spraying 2.1 Calcium formate Chemically obtained product containing calcium formate as essential ingredient 33,6 % CaO Calcium expressed as water-soluble CaO 56 % formate Calcium oxide Formate 2.2 Calcium formate fluid Product obtained by dissolution in water of calcium formate 21 % CaO Calcium expressed as water-soluble CaO 35 % formate Calcium oxide Formate 2.3 Calcium chelate of iminodisuccinic acid Chemically obtained product containing calcium chelate of iminodisuccinic acid as essential ingredient, without addition of organic nutrients of animal or vegetable origin 9 % CaO Calcium expressed as CaO, chelated by iminodisuccinic acid (IDHA) water-soluble. Calcium expressed as CaO, chelated by iminodisuccinic acid (IDHA) water-soluble 3 Elemental sulphur Comparatively refined natural or industrial product 98 % S (245 %: SO3) Sulphur expressed as total SO3 Total sulphur trioxide 4 Kieserite Product of mineral origin containing monohydrated magnesium sulphate as main component 24 % MgO 45 % SO3 Magnesium and sulphur expressed as water-soluble magnesium oxide and sulphur trioxide Usual trade names may be added Water-soluble magnesium oxide Optional: water-soluble sulphur trioxide 5 Magnesium sulphate Product containing heptahydrated magnesium sulphate as main ingredient 15 % MgO 28 % SO 3 Where micro-nutrients are added, and declared in accordance with Article 6(4) and 6(6): 10 % MgO 17 % SO 3 Magnesium and sulphur expressed as water-soluble magnesium oxide and sulphur trioxide The usual trade names may be added Water-soluble magnesium oxide Water-soluble sulphur trioxide 5.1 Magnesium sulphate solution Product obtained by dissolution in water of magnesium sulphate of industrial origin 5 % MgO 10 % SO3 Magnesium and sulphur expressed as water-soluble magnesium oxide and water-soluble sulphuric anhydride Usual trade names may be added Water-soluble magnesium oxide Optional: water-soluble sulphuric anhydride 5.2 Magnesium hydroxide Product obtained chemically and having as its essential ingredient magnesium hydroxide 60 % MgO Particle size: at least 99 % able to pass through a sieve with a mesh of 0,063 mm Total magnesium oxide 5.3 Suspension of magnesium hydroxide Product obtained by suspension of type 5.2 24 % MgO Total magnesium oxide 6 Magnesium chloride solution Product obtained by dissolving magnesium chloride of industrial origin 13 % MgO Magnesium expressed as magnesium oxide Maximum calcium content: 3 % CaO Magnesium oxide --- Source: https://www.legislation.gov.uk/eur/2003/2003/division/D. (the official version) Page: https://openlegislation.uk/eu-regulation-2003-2003/division-D. Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.