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Variability of official methods of chemical analysis of fertilizers (N, P, K) in Brazil



Variability of official methods of chemical analysis of fertilizers (N, P, K) in Brazil



Revista de Agricultura, Brazil 55(3): 201-216



The methods for determining N, P2O5 and K2O in fertilizers, adopted as standard by Brazilian legislation, were studied in a programme to assess the magnitude of variation among laboratories. Twelve NPK fertilizer mixtures, containing high, medium or low levels of N, P2O5 and K2O, were analysed by 20 laboratories. There were significant differences among laboratories, with large confidence intervals.

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