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Ammonium nitrate (1,250/5,000): fertiliser grade This applies to straight ammonium nitrate-based fertilisers and to ammonium nitrate-based compound/composite fertilisers which fulfil the requirements of Annex III-2 to Regulation (EC) No 2003/2003 as amended from time to time and in which the nitrogen content as a result of ammonium nitrate is— (a) more than 24.5% by weight, except for mixtures of straight ammonium nitrate based fertilisers with dolomite, limestone and/or calcium carbonate with a purity of at least 90%; (b) more than 15.75% by weight for mixtures of ammonium nitrate and ammonium sulphate; (c) more than 28% by weight for mixtures of straight ammonium nitrate-based fertilisers with dolomite, limestone and/or calcium carbonate with a purity of at least 90%.