# 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 A.3: Potassic 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 on the type designation
Nutrient content to be declaredForms and solubilities of the nutrientsOther criteria
1
2
3
4
5
6
1
Crude potassium salt
Product obtained from crude potassium salts
9 % K 2 O
Potassium expressed as water-soluble K 2 O
2 % MgO
Magnesium in the form of water-soluble salts, expressed as magnesium oxide
Usual trade names may be added
Water-soluble potassium oxide
Water-soluble magnesium oxide
Total sodium oxide
Chloride content must be declared
2
Enriched crude potassium salt
Product obtained from crude potassium salts enriched by blending with potassium chloride
18 % K 2 O
Potassium expressed as water-soluble K 2 O
Usual trade names may be added
Water-soluble potassium oxide
Optional mention of the water-soluble magnesium oxide content where higher than 5 % MgO
3
Muriate of potash
Product obtained from crude potassium salts and containing potassium chloride as its essential ingredient
37 % K2O
Potassium expressed as water-soluble K2O
Usual trade names may be added
Water-soluble potassium oxide
4
Potassium chloride containing magnesium salts
Product obtained from crude potassium salts with added magnesium salts and containing potassium chloride and magnesium salts as essential ingredients
37 % K2O
Potassium expressed as water-soluble K2O
Water-soluble potassium oxide
Water-soluble magnesium oxide
5 % MgO
Magnesium in the form of water-soluble salts, expressed as magnesium oxide
5
Sulphate of potash
Product obtained chemically from potassium salts and containing potassium sulphate as its essential ingredient
47 % K2O
Potassium expressed as water-soluble K2O
Maximum chloride content: 3 % Cl
Water-soluble potassium oxide
Optional mention of the chloride content
6
Sulphate of potash containing magnesium salt
Product obtained chemically from potassium salts, possibly with addition of magnesium salts, and containing potassium sulphate and magnesium sulphate as essential ingredients
22 % K2O
Potassium expressed as water-soluble K2O
Usual trade names may be added
Water-soluble potassium oxide
Water-soluble magnesium oxide
Optional mention of the chloride content
8 % MgO
Magnesium in the form of water-soluble salts, expressed as magnesium oxide
Maximum chloride content: 3 % Cl
7
Kieserite with potassium sulphate
Product obtained from Kieserite with potassium sulphate added
8 % MgO
Magnesium expressed as water-soluble MgO
Usual trade names may be added
Water-soluble magnesium oxide
Water-soluble potassium oxide
Optional mention of the chloride content
6 % K2O
Potassium expressed as water-soluble K2O
Total MgO + K2O: 20 %
Maximum chloride content: 3 % Cl

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Source: https://www.legislation.gov.uk/eur/2003/2003/division/A./division/A.3. (the official version)
Page: https://openlegislation.uk/eu-regulation-2003-2003/division-A./division-A.3.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.