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| 2. |  | FERRAO, R. G.; SILVA, J. C.; CRUZ, C. D. Analise da capacidade combinatoria de linhagens de milho, quanto a producao e angulo de insercao da folha no colmo, em um sistema dialelico incompleto. Revista Ceres, Vicosa, v. 34, n. 195, p. 462-473, set./out. 1987.| Biblioteca(s): Epagri-Sede. |
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| 6. | | NASCIMENTO, M.; FERREIRA, A.; FERRÃO, R. G.; CAMPANA, A. C. M.; BHERING, L. L.; CRUZ, C. D.; FERRÃO, M. A. G.; FONSECA, A. F. A. da. Adaptabilidade e estabilidade via regressão não paramétrica em genótipos de café. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 45, n. 1, p. 41-48, jan. 2010.| Biblioteca(s): Epagri-Sede. |
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| 7. | | CECON, P.R.; SILVA, F.F.e; FERREIRA, A.; FERRÃO, R.G.; CARNEIRO, A.P.S.; DETMANN, E.; FARIA, P.N.; MORAIS, T.S.da S. Análise de medidas repetidas na avaliação de clones de café 'Conilon'. Pesquisa Agropecuaria Brasileira, Brasília, v.43, n.9, p.1171-1176, set. 2008.| Biblioteca(s): Epagri-Sede. |
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| 9. | | FONSECA, A. F. A. da; SEDIYAMA, T.; CRUZ, C. D.; SAKAIYAMA, N. S.; FERRAO, M. A. G.; FERRAO, R. G.; BRAGANCA, S. M. Divergencia genetica em cafe conilon. Pesquisa Agropecuaria Brasileira, Brasilia, v. 41, n. 4, p. 599-605, abr. 2006.| Biblioteca(s): Epagri-Sede. |
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| 13. | | FERRAO, R. G.; FONSECA, A. F. A. da; FERRAO, M. A. G.; MUNER, L. H. de; VERDIN FILHO, A. C.; VOLPI, P. S.; MARQUES, E. M. G.; ZUCATELI, F. Cafe conilon: tecnicas de producao com variedades melhoradas. Vitoria, ES: Incaper, 2004. 60p. (Incaper. Circular Tecnica, 03-l).| Biblioteca(s): Epagri-Sede. |
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| 14. | | FERRAO, R.G.; CRUZ, C.D.; FERREIRA, A.; CECON, P.R.; FERRAO, M.A.G.; FONSECA, A.F.A.da; CARNEIRO, P.C.de S.; SILVA, M.F.da. Parâmetros genéticos em café Conilon. Pesquisa Agropecuaria Brasileira, Brasilia, v.43, n.1, p.61-69, jan. 2008.| Biblioteca(s): Epagri-Sede. |
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Registro Completo
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
21/06/2011 |
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Data da última atualização: |
29/06/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
-- - -- |
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Autoria: |
LEMAIRE, G.; OOSTEROM, E. V.; SHEEHY, J.; JEUFFROY, M. H.; MASSIGNAM, A. M.; ROSSATO, L. |
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Afiliação: |
Epagri |
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Título: |
Is crop N demand more closely related to dry matter accumulation or leaf area expansion during vegetative growth? |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Field Crops Research, Amsterdam, v. 100, n. 1, p. 91-106, 2007. |
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Idioma: |
Inglês |
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Notas: |
ISSN, 0378-4290 |
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Conteúdo: |
The critical crop nitrogen uptake is defined as the minimum nitrogen uptake necessary to achieve maximum biomass accumulation (W). Across a range of crops, the critical N uptake is related to W by a power function with a coefficient less than unity that suggests crop N uptake is co-regulated by both soil N supply and biomass accumulation. However, crop N demand is also often linearly related to the expansion of the leaf area index (LAI) during the vegetative growth period. This suggests that crop N demand could be also linked with LAI extension. In this paper, we develop theory to combine these two concepts within a common framework. The aim of this paper is to determine whether generic relationships between N uptake, biomass accumulation, and LAI expansion could be identified that would be robust across both species and environment types. To that end, we used the framework to analyze data on a range of species, including C3 and C4 ones and mono- and di-cotyledonous crops. All crops were grown in either temperate or tropical and subtropical environments without limitations on N supply. The relationship between N uptake and biomass was more robust, across environment types, than the relationship of LAI with biomass. In general, C3 species had a higher N uptake per unit biomass than C4 species, whereas dicotyledonous species tended to have higher LAI per unit biomass than monocotyledonous ones. Species differences in N uptake per unit biomass were partly associated with differences in LAI and N-partitioning. Consequently the critical leaf-N uptake per unit LAI (specific leaf nitrogen, SLN) was relatively constant across species at 1.8?2.0 g m−2, a value that was close to published data on the critical SLN of new leaves at the top of the canopy. Our results indicate that critical N uptake curves as a function of biomass accumulation may provide a robust platform for simulating N uptake of a species. However, if crop simulation models are to capture the genotypic and environmental control of crop N dynamics in a physiologically functional manner, plant growth has to be considered as the sum of a metabolic (e.g. leaves) and a structural (e.g. stems) compartment, each with its own demand for metabolic and structural N. MenosThe critical crop nitrogen uptake is defined as the minimum nitrogen uptake necessary to achieve maximum biomass accumulation (W). Across a range of crops, the critical N uptake is related to W by a power function with a coefficient less than unity that suggests crop N uptake is co-regulated by both soil N supply and biomass accumulation. However, crop N demand is also often linearly related to the expansion of the leaf area index (LAI) during the vegetative growth period. This suggests that crop N demand could be also linked with LAI extension. In this paper, we develop theory to combine these two concepts within a common framework. The aim of this paper is to determine whether generic relationships between N uptake, biomass accumulation, and LAI expansion could be identified that would be robust across both species and environment types. To that end, we used the framework to analyze data on a range of species, including C3 and C4 ones and mono- and di-cotyledonous crops. All crops were grown in either temperate or tropical and subtropical environments without limitations on N supply. The relationship between N uptake and biomass was more robust, across environment types, than the relationship of LAI with biomass. In general, C3 species had a higher N uptake per unit biomass than C4 species, whereas dicotyledonous species tended to have higher LAI per unit biomass than monocotyledonous ones. Species differences in N uptake per unit biomass were partly associated with differ... Mostrar Tudo |
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Palavras-Chave: |
Biomass accumulation; Critical N-uptake; LAI; Leaf Area Ratio; N-demand; Specific Leaf Nitrogen. |
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Categoria do assunto: |
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Marc: |
LEADER 02870naa a2200205 a 4500
001 1077743
005 2011-06-29
008 2007 bl uuuu u00u1 u #d
100 1 $aEpagri
245 $aIs crop N demand more closely related to dry matter accumulation or leaf area expansion during vegetative growth?
260 $c2007
500 $aISSN, 0378-4290
520 $aThe critical crop nitrogen uptake is defined as the minimum nitrogen uptake necessary to achieve maximum biomass accumulation (W). Across a range of crops, the critical N uptake is related to W by a power function with a coefficient less than unity that suggests crop N uptake is co-regulated by both soil N supply and biomass accumulation. However, crop N demand is also often linearly related to the expansion of the leaf area index (LAI) during the vegetative growth period. This suggests that crop N demand could be also linked with LAI extension. In this paper, we develop theory to combine these two concepts within a common framework. The aim of this paper is to determine whether generic relationships between N uptake, biomass accumulation, and LAI expansion could be identified that would be robust across both species and environment types. To that end, we used the framework to analyze data on a range of species, including C3 and C4 ones and mono- and di-cotyledonous crops. All crops were grown in either temperate or tropical and subtropical environments without limitations on N supply. The relationship between N uptake and biomass was more robust, across environment types, than the relationship of LAI with biomass. In general, C3 species had a higher N uptake per unit biomass than C4 species, whereas dicotyledonous species tended to have higher LAI per unit biomass than monocotyledonous ones. Species differences in N uptake per unit biomass were partly associated with differences in LAI and N-partitioning. Consequently the critical leaf-N uptake per unit LAI (specific leaf nitrogen, SLN) was relatively constant across species at 1.8?2.0 g m−2, a value that was close to published data on the critical SLN of new leaves at the top of the canopy. Our results indicate that critical N uptake curves as a function of biomass accumulation may provide a robust platform for simulating N uptake of a species. However, if crop simulation models are to capture the genotypic and environmental control of crop N dynamics in a physiologically functional manner, plant growth has to be considered as the sum of a metabolic (e.g. leaves) and a structural (e.g. stems) compartment, each with its own demand for metabolic and structural N.
653 $aBiomass accumulation
653 $aCritical N-uptake
653 $aLAI
653 $aLeaf Area Ratio
653 $aN-demand
653 $aSpecific Leaf Nitrogen
773 $tField Crops Research, Amsterdam$gv. 100, n. 1, p. 91-106, 2007.
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