| Registro completo |
| Provedor de dados: |
R. Bras. Zootec.
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| País: |
Brazil
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| Título: |
Gas exchange in massai grass under five nitrogen fertilization levels during establishment and regrowth
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| Autores: |
Lopes,Marcos Neves
Lacerda,Claudivan Feitosa de
Cândido,Magno José Duarte
Pompeu,Roberto Cláudio Fernandes Franco
Silva,Rodrigo Gregório da
Lopes,José Wellington Batista
Fernandes,Francisco Ronaldo Belém
Bezerra,Francisco Marcus Lima
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| Data: |
2011-09-01
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| Ano: |
2011
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| Palavras-chave: |
Chlorophyll
CO2 concentration
Panicum maximum
Photosynthesis
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| Resumo: |
The objective of this study was to evaluate gas exchange in the massai grass during establishment and regrowth cycles in a greenhouse, using five nitrogen (N) fertilization levels. A completely randomized split-plot design of five nitrogen levels (0; 150; 300; 450 and 600 mg Ndm-3 of soil) was employed with the N levels as plots, and the cycles (establishment, regrowth 1 and 2) as subplots, evaluated with five replicates. We evaluated leaf transpiration (E), leaf temperature (TFOL), leaf photosynthesis rate (A), leaf carbon dioxide concentration (Ci), stomatal conductance (gs), photosynthesis/transpiration ratio (A/E), photosynthesis/conductance ratio (A/gs), chlorophyll relative index (CRI), and nitrogen sufficiency index (NSI). Growth cycles influenced all physiological characteristics, except for NSI. N fertilization levels affected TFOL, A, CRI and NSI variables, whereas for gs, E, Ci, A/E and A/gs it did not occur. A increased from 6.38 to 10.33 µmolm-2.s-1, at levels 0 and 600 mg Ndm-3 of soil, respectively. Gas exchange in the massai grass was favored by nitrogen fertilization, since the cycles amended these characteristics of the grass.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000900004
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| Editor: |
Sociedade Brasileira de Zootecnia
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| Relação: |
10.1590/S1516-35982011000900004
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| Formato: |
text/html
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| Fonte: |
Revista Brasileira de Zootecnia v.40 n.9 2011
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| Direitos: |
info:eu-repo/semantics/openAccess
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