# The Fertilisers Regulations (Northern Ireland) 1992, Paragraph 6


The content declared in accordance with paragraphs 1(d), 1(e) and 1(f) shall be indicated both in words and by the appropriate chemical symbol as follows:—
(a) Nitrogen (N)
(b) Phosphorus pentoxide (P2O5)
(c) Potassium oxide (K2O)
(d) Magnesium oxide (MgO)
(e) Calcium oxide (CaO)
(f) Sodium oxide (Na2O)
(g) Sulphur trioxide (SO3)
(h) Chlorine (Cl)
(i) Boron (B)
(j) Cobalt (Co)
(k) Copper (Cu)
(l) Iron (Fe)
(m) Manganese (Mn)
(n) Molybdenum (Mo)
(o) Zinc (Zn)
and where all or part of the trace element is chemically linked with an organic molecule named in table 2, the name of that element followed by “chelated by …” followed by the name of the chelating agent or its abbreviation as set out in table 2 to this Schedule.

---
Source: https://www.legislation.gov.uk/nisr/1992/187/schedule/2/paragraph/6 (the official version)
Page: https://openlegislation.uk/fertilisers-regulations-northern-ireland-1992/schedule-2/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.