# The Fertilisers Regulations 1991, Paragraph 8


The limits of variation for trace elements and secondary nutrients other than where prescribed in Sections D and E of the following table shall be:
(i) trace elements — up to one-fifth of the declared value for a trace element content not exceeding 2% and 0.4% in absolute terms for a content of more than 2%;
(ii) secondary nutrients in the oxide form — up to a quarter of the declared value for a secondary nutrient content not exceeding 3.6% and 0.9% in absolute terms for a content of more than 3.6%. This is equivalent to the following maxima for the elemental forms—
0.64% maximum for Ca
0.55% maximum for Mg
0.67% maximum for Na
0.36% maximum for S.

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Source: https://www.legislation.gov.uk/uksi/1991/2197/schedule/1/paragraph/8 (the official version)
Page: https://openlegislation.uk/fertilisers-regulations-1991/schedule-1/paragraph-8
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.