Data/hora: 09/06/2024 06:22:15

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	11/08/2015	
Data da última atualização: 	09/11/2021	
Autoria: 	INACIO, C. T.; CHALK, P. M.; MAGALHÃES, A. M. T.	
Afiliação: 	CAIO DE TEVES INACIO, CNPS; PHILLIP MICHAEL CHALK; ALBERTO M. T. MAGALHÃES.	
Título: 	Principles and limitations of stable isotopes in differentiating organic and conventional foodstuffs: 1. Plant products.	
Ano de publicação: 	2015	
Fonte/Imprenta: 	Critical Reviews in Food Science and Nutrition, v. 55, n. 9, p. 1206-1218, 2015.	
DOI: 	https://doi.org/10.1080/10408398.2012.689380	
Idioma: 	Inglês	
Conteúdo: 	Among the lighter elements having two or more stable isotopes (H, C, N, O, S), delta15N appears to be the most promising isotopic marker to differentiate plant products from conventional and organic farms. Organic plant products vary within a range of delta15N values of +0.3 to +14.6%, while conventional plant products range from negative to positive values, i.e. - 4.0 to +8.7%. The main factors affecting delta15N signatures of plants are N fertilizers, biological N2 fixation, plant organs and plant age. Correlations between mode of production and delta13C (except greenhouse tomatoes warmed with natural gas) or delta34S signatures have not been established, and delta2H and delta18O are unsuitable markers due to the overriding effect of climate on the isotopic composition of plant-available water. Because there is potential overlap between the delta15N signatures of organic and conventionally produced plant products, delta15N has seldom been used successfully as the sole criterion for differentiation, but when combined with complementary analytical techniques and appropriate statistical tools, the probability of a correct identification increases. The use of organic fertilizers by conventional farmers or the marketing of organic produce as conventional due to market pressures are additional factors confounding correct identification. The robustness of using delta15N to differentiate mode of production will depend on the establishment of databases that have been verified for individual plant products.	
Palavras-Chave: 	Análise isotópica.	
Thesagro: 	Adubo orgânico; Fertilizante; Isótopo.	
Thesaurus Nal: 	Organic fertilizers; Stable isotopes.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (18959-1) - UPC - AP - DD -  -  - 2015.00183 - DIS