Fertilizers; mineral or chemical, nitrogenous

310210 Fertilizers, mineral or chemical; nitrogenous, urea, whether or not in aqueous solution 310221 Fertilizers, mineral or chemical; nitrogenous, ammonium sulphate 310229 Fertilizers, mineral or chemical; nitrogenous, other than ammonium sulphate 310230 Fertilizers, mineral or chemical; nitrogenous, ammonium nitrate, whether or not in aqueous solution 310240 Fertilizers, mineral or chemical; ammonium nitrate with calcium carbonate or other inorganic non-fertilizing substances, mixtures thereof 310250 Fertilizers, mineral or chemical; nitrogenous, sodium nitrate 310260 Fertilizers, mineral or chemical; nitrogenous, double salts and mixtures of calcium nitrate and ammonium nitrate 310280 Fertilizers, mineral or chemical; nitrogenous, mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution 310290 Fertilizers, mineral or chemical; nitrogenous, other kinds including mixtures not specified in the foregoing subheadings