Nitrogen and Carbon Isotope Composition of Organic Fertilizers
نویسندگان
چکیده
Synthetic (e.g. urea) and organic fertilizers (e.g. compost) differed markedly in N isotope composition and the greater the difference between organic and synthetic fertilizer the more robust will be the differentiation of crops and vegetable grown under different farming systems. 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 ( 15 N, 13 C). Organic fertilizers and manure samples were enriched in 15 N as expected. Using synthetic fertilizers as the primary material of organo-mineral fertilizer can imprint a low 15 N value to the final product. Organic fertilizers, organo-mineral fertilizers and manures can have their organic feedstock differentiated using 13 C. These are preliminary data of the isotopic composition of organic fertilizer in Brazil. Therefore, a wider survey of fertilizers and an experimental approach for organicand organo-mineral fertilizer production is needed to elucidate the natural isotope variation of the array of available products.
منابع مشابه
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