Fertilizers

BS 5551-4.1.2:1982 Fertilizers. Chemical analysis. Determination of nitrogen. Determination of ammoniacal nitrogen, titrimetric method after distillation
BS 5551-4.1.3:1986 Fertilizers. Chemical analysis. Determination of nitrogen. Method for determination of total nitrogen content (titrimetric method after distillation)
BS 5551-4.1.4:1984 Fertilizers. Chemical analysis. Determination of nitrogen. Method for determination of ammoniacal nitrogen content in the presence of other substances which release ammonia when treated with sodium hydroxide (titrimetric method)
BS 5551-4.2.1:1978 Fertilizers. Chemical analysis. Determination of phosphorus. Extraction of water-soluble phosphates
BS 5551-4.2.3:1987 Fertilizers. Chemical analysis. Determination of phosphorus. Method for determination of phosphorus content (quinoline molybdophosphate gravimetric method)
BS 5551-4.3.1:1983 Fertilizers. Chemical analysis. Determination of potassium Preparation of the test solution for determination of water-soluble potassium content
BS 5551-4.3.2:1983 Fertilizers. Chemical analysis. Determination of potassium. Preparation of the test solution for determination of acid-soluble potassium content
BS 5551-4.5:1993 Fertilizers. Chemical analysis. Method for determination of mineral-acid-soluble sulfate content of solid fertilizers

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