Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/113128
Unidade da Embrapa/Coleção:: Área de Informação da Sede - Artigo em periódico indexado (ALICE)
Data do documento: 21-Fev-2005
Tipo do Material: Artigo em periódico indexado (ALICE)
Autoria: OKITO, A.
ALVES, B. J. R.
URQUIAGA, S.
BODDEY, R. M.
Informaçães Adicionais: Embrapa Agrobiologia.
Título: Nitrogen fixation by groundnut and velvet bean and residual benefit to a subsequent maize crop.
Edição: 2004
Fonte/Imprenta: Pesquisa Agropecuária Brasileira, Brasília, DF, v.39, n.12, p.1183-1190, dezembro 2004.
Idioma: en
Palavras-chave: 15N natural abundance technique
N balance
small-holder producers
abundância natural de 15N
adubos verdes
balanço de N
rotação de culturas.
Conteúdo: Chemical fertilisers are rarely avaiable to poor farmers, for whom the nitrogen (N) is often the most limiting element for cereal grain production. The objective of this study was to quantify the contribution of biological nitrogen fixation (BNF) to groundnut (Arachis hypogaea) and velvet bean (Mucuna pruriens) crops using the 15N natural abundance (d15N) technique and to determine their residual effect and that of a natural fallow, on growth and N accumulation by two rustic maize varieties. The contribution of BNF calculated from d15N data was 40.9, 59.6 and 30.9 kg ha-1, for groundnut, velvet bean and the natural fallow, respectively. The only legume grain harvested was from the groundnut, which yielded approximately 1.000 kg ha-1. The subsequent maize varieties ("Sol de Manhã" and "Caiana Sobralha") yielded between 1.958 and 2.971 kg ha-1, and were higher after velvet bean for both maize varieties and "Sol da Manhã" groundnut, followed by "Caiana" after groundnut and, finally, the natural fallow. For a small-holder producer the most attractive system is the groundnut followed by maize, as, in this treatment, both groundnut and maize grain harvest are possible. However, a simple N balance calculation indicated that the groundnut-maize sequence would, in the long term, deplete soil N reserves, while the velvet bean-maize sequence would lead to a build up of soil nitrogen.
Thesagro: Agricultura Familiar
Arachis Hypogaea
Zea Mays.
NAL Thesaurus: Mucuna pruriens
green manures.
Ano de Publicação: 2004
Aparece nas coleções:Artigo em periódico indexado (AI-SEDE) / Embrapa Informação Tecnológica (SCT)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
39n12a04.pdf49,84 kBAdobe PDFThumbnail
Visualizar/Abrir

FacebookTwitterDeliciousLinkedInGoogle BookmarksMySpace