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| 5. |  | CHALK, P. M. From production to consumption: tracing C, N, and S dynamics in brazilian agroecosystems using stable isotopes. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 51, n. 9, p. 1039-1050, set. 2016. Título em português: Da produção ao consumo: traçando a dinâmica de C, N e S nos agroecossistemas brasileiros com uso de isótopos estáveis.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 14. | | HOPMANS, P.; CHALK, P. M.; DOUGLAS, L. A. Determination of nitogen fixation by legumes grown in pots by an 15N method and acetylene reduction. In: Ninth International Plant Nutrition Colloquim, Warwick University, Coventry, U.K., 22-27 August 1982., v., p.-, 1982.| Biblioteca(s): Embrapa Agrobiologia. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Agrobiologia. Para informações adicionais entre em contato com cnpab.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
29/10/2015 |
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Data da última atualização: |
29/10/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
INACIO, C. de T.; URQUIAGA, S.; CHALK, P. M.; MATA, M. G. F.; SOUZA, P. O. |
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Afiliação: |
CAIO DE TEVES INACIO, CNPS; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; PHILLIP M. CHALK; UFRRJ; UFRRJ. |
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Título: |
Identifying N fertilizer regime and vegetable production system in tropical Brazil using 15 N natural abundance. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Journal of the Science of Food and Agriculture, London, UK, v. 95, p. 3025-3032, 2015. |
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DOI: |
10.1002/jsfa.7177 |
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Idioma: |
Português |
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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.
RESULTS. Samples of soil, lettuce and organic inputs were taken from two organic, one conventional and one hydroponic farm. The two organic farms had different N-sources with ?15?N values ranging from 0.0 to +14.9? (e.g. leguminous green manure 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 manure made a small contribution to the N nutrition of lettuce in the multi-N-source organic farm.
CONCLUSION: To differentiate organic versus conventional farms using ?15?N the several subsets of mode 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. © 2015 Society of Chemical Industry |
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Palavras-Chave: |
Analytical method; Organic Hydroponics; Pesticide residue. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02016naa a2200217 a 4500
001 2027543
005 2015-10-29
008 2015 bl --- 0-- u #d
024 7 $a10.1002/jsfa.7177$2DOI
100 1 $aINACIO, C. de T.
245 $aIdentifying N fertilizer regime and vegetable production system in tropical Brazil using 15 N natural abundance.
260 $c2015
520 $aThis 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. RESULTS. Samples of soil, lettuce and organic inputs were taken from two organic, one conventional and one hydroponic farm. The two organic farms had different N-sources with ?15?N values ranging from 0.0 to +14.9? (e.g. leguminous green manure 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 manure made a small contribution to the N nutrition of lettuce in the multi-N-source organic farm. CONCLUSION: To differentiate organic versus conventional farms using ?15?N the several subsets of mode 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. © 2015 Society of Chemical Industry
653 $aAnalytical method
653 $aOrganic Hydroponics
653 $aPesticide residue
700 1 $aURQUIAGA, S.
700 1 $aCHALK, P. M.
700 1 $aMATA, M. G. F.
700 1 $aSOUZA, P. O.
773 $tJournal of the Science of Food and Agriculture, London, UK$gv. 95, p. 3025-3032, 2015.
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