Gas exchange in massai grass under five nitrogen fertilization levels during establishment and regrowth.

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dc.contributorMarcos 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.
dc.creatorLOPES, M. N.
dc.creatorLACERDA, C. F. de
dc.creatorCÂNDIDO, M. J. D.
dc.creatorPOMPEU, R. C. F. F.
dc.creatorSILVA, R. G. da
dc.creatorLOPES, J. W. B.
dc.creatorFERNANDES, F. R. B.
dc.creatorBEZERRA, F. M. L.
dc.date2011-09-02T11:11:11Z
dc.date2011-09-02T11:11:11Z
dc.date2011-09-02T11:11:11Z
dc.date2011-09-02
dc.date2011
dc.date2019-09-23T11:11:11Z
dc.date.accessioned2026-07-01T00:15:09Z
dc.descriptionThe 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.
dc.identifierRevista Brasileira de Zootecnia, v. 40, n. 9, p. 1862-1869, 2011.
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/899510
dc.identifier.urihttp://hdl.handle.net/123456789/400103
dc.languagepor
dc.rightsopenAccess
dc.subjectCeará
dc.subjectFortaleza
dc.subjectVariedade Massai
dc.subjectPanicum maximum
dc.subjectPastagem
dc.subjectGramínea forrageira
dc.subjectChlorophyll
dc.subjectPhotosynthesis
dc.subjectBrazil
dc.titleGas exchange in massai grass under five nitrogen fertilization levels during establishment and regrowth.
dc.typeArtigo de periódico

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