Fertilisers Regulation, Annex I, A, E.1, E2.4 and G

EU Regulation 2003/2003 consolidates all the European Union rules that apply to fertilisers, and ensures that the technical requirements outlined in the regulation are implemented uniformly. The regulation only applies to mineral fertilisers consisting of one or more plant nutrients. Annex I lists fertiliser types according to their specific characteristics, while Annex II provides a list of associated tolerances.

Ref No.
Annex Section
D Inorganic secondary nutrient fertilisers
Minimum content of nutrients (percentage by weight). Data on the expression of nutrients. Other requirements Nutrient (a) Minimum content
28 % by weight
Nutrient (a) Expressed as
As SO3
Other nutrient (a)
Mg Minimum content
15 % by weight
Mg Expressed as
As water-soluble magnesium oxide
Nutrient declaration
Water-soluble magnesium oxide

Water-soluble sulphur trioxide

Other data
Usual trade names may be added
for calcium, magnesium, sodium and sulphur contents shall be a quarter of the declared contents of these nutrients up to a maximum of 0.9 % in absolute terms for CaO, MgO, Na2O, and SO3, i.e. 0.64 for Ca, 0.55 for Mg, 0.67 for Na and 0.36 for S
Production and Ingredients
Product containing heptahydrated magnesium sulphate as main ingredient
Type designation
Magnesium sulphate

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