# The Fertilisers Regulations 1991, Paragraph 6


In the case of materials in Groups 1 to 4 of Section B and Group 2 of Section C of the following table which ... are sold or offered for sale, and where the declared content of one or more of the nutrients falls below the following levels:
(i) in the case of nitrogen (N) — 2.5% in an NPK fluid fertiliser solution and 3.5% for all other fertilisers and
(ii) in the case of phosphorus pentoxide (P2O5) and potassium oxide (K2O) — 3.5% in a fluid fertiliser solution, 4.5% in an NPK fluid fertiliser suspension and 5.5% for all other fertilisers,
the limit of variation for the declared nutrient in such cases shall be that specified in the sixth column of the following table.

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Source: https://www.legislation.gov.uk/uksi/1991/2197/schedule/1/paragraph/6 (the official version)
Page: https://openlegislation.uk/fertilisers-regulations-1991/schedule-1/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.