Article 18 Calcium, magnesium, sodium and sulphur
United Kingdom
The declaration of the magnesium, sodium and sulphur content of the fertilisers listed in sections A, B, and C of Annex I shall be expressed in one of the following ways:
the total content expressed as a percentage of the fertiliser by mass;
the total content and the content soluble in water, expressed as a percentage of the fertiliser by mass where the soluble content is at least a quarter of the total content;
where an element is totally soluble in water, only the content soluble in water shall be declared as a percentage of the mass.
Unless otherwise stated in Annex I, a declaration of the calcium content shall only be made if it is soluble in water and shall be expressed as a percentage of the fertiliser by mass.