Título:	Gas exchange in massai grass under five nitrogen fertilization levels during establishment and regrowth.
Autoria:	LOPES, M. N. LACERDA, C. F. de CÂNDIDO, M. J. D. POMPEU, R. C. F. F. SILVA, R. G. da LOPES, J. W. B. FERNANDES, F. R. B. BEZERRA, F. M. L.
Afiliação:	Marcos Neves Lopes, Universidade Federal do Ceará - UFC, Fortaleza, CE.; Claudivan Feitosa de Lacerda, UFC, Fortaleza, CE.; Magno José Duarte Cândido, UFC. Fortaleza, CE.; ROBERTO CLAUDIO FERNANDES F POMPEU, CNPC; Rodrigo Gregório da Silva, Instituto Federal de Educação, Ciência e Tecnologia - IFCE, Campus Avançado do Tauá, CE.; José Wellington Batista Lopes, UFC, Fortaleza, CE.; Francisco Ronaldo Belém Fernandes, UFC, Fortaleza, CE.; Francisco Marcus Lima Bezerra, UFC, Fortaleza, CE.
Ano de publicação:	2011
Referência:	Revista Brasileira de Zootecnia, v. 40, n. 9, p. 1862-1869, 2011.
Conteúdo:	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 N?dm-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 μmol?m-2. s-1, at levels 0 and 600 mg N?dm-3 of soil, respectively. Gas exchange in the massai grass was favored by nitrogen fertilization, since the cycles amended these characteristics of the grass.
Thesagro:	Panicum maximum Pastagem Gramínea forrageira
NAL Thesaurus:	Chlorophyll Photosynthesis Brazil
Palavras-chave:	Variedade Massai Ceará Fortaleza
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPC)