Data/hora: 24/06/2024 14:26:12

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	09/12/2015	
Data da última atualização: 	02/02/2016	
Autoria: 	INACIO, C. T.; URQUIAGA, S.; CHALK, P. M.; MATA, M. G. F.; SOUZA, P. O.	
Afiliação: 	CAIO DE TEVES INACIO, CNPS; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; PHILLIP MICHAEL CHALK, PESQ. VISITANTE CNPS; MARIA GABRIELA F. MATA, UFRRJ; PAULO O. SOUZA, UFRRJ.	
Título: 	Identifying N fertilizer regime and vegetable production system in tropical Brazil using 15N natural abundance.	
Ano de publicação: 	2015	
Fonte/Imprenta: 	Journal of the Science of Food and Agriculture, v. 95, n. 15, p. 3025-3032, Dec. 2015.	
DOI: 	10.1002/jsfa.7177	
Idioma: 	Inglês	
Conteúdo: 	This study was conducted in areas of vegetable production in tropical Brazil,with the objectives of (i)measuring the variation in ??15 N in soils, organic N fertilizer sources and lettuce (Lactuca sativa L.) from different farming systems, (ii) measuring whether plant ??15 N can differentiate organic versus conventional lettuce and (iii) identifying the factors affecting lettuce ??15 N. Samples of soil, lettuce and organic inputs were taken from two organic, one conventional and one hydroponic farm. The two organic farms haddifferentN-sources with ??15 Nvalues ranging from0.0 to+14.9‰(e.g. leguminous greenmanure and animal manure compost, respectively), and differed significantly (P < 0.05) in lettuce ??15 N (+9.2±1.1‰ and +14.3±1.0‰). Conventional lettuce ??15 N (+8.5±2.7‰) differed from hydroponic lettuce ??15 N (+4.5±0.2‰) due to manure inputs. The N from leguminous green manuremade a small contribution to the N nutrition of lettuce in the multi-N-source organic farm. To differentiate organic versus conventional farms using ??15 N the several subsets ofmode of fertilization should be considered. Comparisons of ??15 N of soil, organic inputs and lettuce allowed a qualitative analysis of the relative importance of different N inputs.	
Palavras-Chave: 	Fertilizante convencional; Fertilizante orgânico; Hidropônico.	
Thesagro: 	Fertilizante.	
Thesaurus Nal: 	Fertilizers.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (19076-1) - UPC - AP - DD -  -  - 2015.00306 - DIS