Anais do XXXIV Congresso Brasileiro de Ciência do Solo

NITROGEN AND CARBON ISOTOPE COMPOSITION OF ORGANIC FERTILIZER

CAIO DE TEVES INÁCIO⁽¹⁾; SEGUNDO URQUIAGA⁽¹⁾; PHILLIP MICHAEL CHALK⁽²⁾;
1 - EMBRAPA; 2 - UNIVERSITY OF MELBOURNE;

The objective of this study was to compare nitrogen and carbon isotope composition of organic fertilizers and manures available for conventional and organic farming in Brazil. Seven samples of organic fertilizer, two of organo-mineral fertilizers and two of different animal manures were analyzed for nitrogen and carbon isotope composition (d15N, d13C). Organic fertilizers and manure samples were enriched in d15N as expected. Using synthetic fertilizers as the primary material of organo-mineral fertilizer can imprint a low d15N value to the final product. Organic fertilizers, organo-mineral fertilizers and manures can have their organic feedstock differentiated using d13C. These are preliminary data of the isotopic composition of organic fertilizer in Brazil. Therefore, a wider survey of fertilizers and an experimental approach for organic- and organo-mineral fertilizer production is needed to elucidate the natural isotope variation of the array of available products.

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