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 | Acesso ao texto completo restrito à biblioteca da Epagri-Sede. Para informações adicionais entre em contato com biblio@epagri.sc.gov.br. |
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Registro Completo |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
04/04/2012 |
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Data da última atualização: |
13/04/2012 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MASSIGNAM, A. M.; CHAPMAN, S. C.; HAMMER, G. L.; FUKAI, S. |
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Afiliação: |
Epagri |
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Título: |
Effects of nitrogen supply on canopy development of maize and sunflower. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Crop and Pasture Science, Victoria, v. 62, n. 2, p. 1045-1055, 2011. |
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Idioma: |
Inglês |
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Notas: |
ISSN, 1836-0947 |
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Conteúdo: |
Nitrogen (N) limitation reduces canopy carbon assimilation by directly reducing leaf photosynthesis, and by developmentally reducing the rate of new leaf area development and accelerating leaf senescence. Effective use of N for biomass production under N limitation may be considered to be a result of a trade-off between the use of N to maintain high levels of specific leaf nitrogen (SLN the amount of N per unit leaf area) for high photosynthetic rate versus using N to maintain leaf area development (leaf area index ? LAI). The objective here is to compare the effects of N supply on the dynamics of LAI and SLN for two crops, maize (Zea mays L.) and sunflower (Helianthus annuus L.) that contrast in the structure and development of their canopy. Three irrigated experiments imposed different levels of N and plant density. While LAI in both maize and sunflower was reduced under N limitation, leaf area development was more responsive to N supply in sunflower than maize. Observations near anthesis showed that sunflower tended to maintain SLN and adjust leaf area under reduced N supply, whereas maize tended to maintain leaf area and adjust SLN first, and, when this was not sufficient, SLN was also reduced. The two species responded differently to variation in N supply, and the implication of these different strategies for crop adaptation and management is discussed. |
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Palavras-Chave: |
Demanda de nitrogênio; Helianthus annuus L; Indice de área foliar; Nitrogênio foliar; Tamanho de foliar; Zea mays L. |
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Categoria do assunto: |
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Marc: |
LEADER 01979naa a2200205 a 4500
001 1084385
005 2012-04-13
008 2011 bl uuuu u00u1 u #d
100 1 $aEpagri
245 $aEffects of nitrogen supply on canopy development of maize and sunflower.
260 $c2011
500 $aISSN, 1836-0947
520 $aNitrogen (N) limitation reduces canopy carbon assimilation by directly reducing leaf photosynthesis, and by developmentally reducing the rate of new leaf area development and accelerating leaf senescence. Effective use of N for biomass production under N limitation may be considered to be a result of a trade-off between the use of N to maintain high levels of specific leaf nitrogen (SLN the amount of N per unit leaf area) for high photosynthetic rate versus using N to maintain leaf area development (leaf area index ? LAI). The objective here is to compare the effects of N supply on the dynamics of LAI and SLN for two crops, maize (Zea mays L.) and sunflower (Helianthus annuus L.) that contrast in the structure and development of their canopy. Three irrigated experiments imposed different levels of N and plant density. While LAI in both maize and sunflower was reduced under N limitation, leaf area development was more responsive to N supply in sunflower than maize. Observations near anthesis showed that sunflower tended to maintain SLN and adjust leaf area under reduced N supply, whereas maize tended to maintain leaf area and adjust SLN first, and, when this was not sufficient, SLN was also reduced. The two species responded differently to variation in N supply, and the implication of these different strategies for crop adaptation and management is discussed.
653 $aDemanda de nitrogênio
653 $aHelianthus annuus L
653 $aIndice de área foliar
653 $aNitrogênio foliar
653 $aTamanho de foliar
653 $aZea mays L
773 $tCrop and Pasture Science, Victoria$gv. 62, n. 2, p. 1045-1055, 2011.
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| Registros recuperados : 3 | |
| 1. |  | MASSIGNAM, A. M.; CHAPMAN, S. C.; HAMMER, G. L.; FUKAI, S. Physiological determinants of maize and sunflower grain yield as affected by nitrogen supply. Field Crops Research, Amsterdam, v. 103, n. 3, p. 256-267, 2009. ISSN, 0378-4290| Tipo: Artigo em Periódico Indexado | Circulação/Nível: -- - -- |
| Biblioteca(s): Epagri-Sede. |
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| 2. | | MASSIGNAM, A. M.; CHAPMAN, S. C.; HAMMER, G. L.; FUKAI, S. Canopy architecture and nitrogen utilisation for biomass production: the contrast between maize and sunflower. In: AUSTRALIAN AGRONOMY CONFERENCE, 10., 2001, Tasmania, Au. Proceedings... Tasmania, Au: Australian Society of Agronomy, 2001.| Tipo: Artigo em Anais de Congresso / Nota Técnica | Circulação/Nível: -- - -- |
| Biblioteca(s): Epagri-Sede. |
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| 3. | | MASSIGNAM, A. M.; CHAPMAN, S. C.; HAMMER, G. L.; FUKAI, S. Effects of nitrogen supply on canopy development of maize and sunflower. Crop and Pasture Science, Victoria, v. 62, n. 2, p. 1045-1055, 2011. ISSN, 1836-0947| Tipo: Artigo em Periódico Indexado | Circulação/Nível: -- - -- |
| Biblioteca(s): Epagri-Sede. |
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| Registros recuperados : 3 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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