Data/hora: 23/06/2024 07:07:39

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | B - 1
Data corrente: | 02/09/2011
Data da última atualização: | 23/09/2019
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.
Título: | Gas exchange in massai grass under five nitrogen fertilization levels during establishment and regrowth.
Ano de publicação: | 2011
Fonte/Imprenta: | Revista Brasileira de Zootecnia, v. 40, n. 9, p. 1862-1869, 2011.
Idioma: | Português
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 &#956;mol?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.
Palavras-Chave: | Ceará; Fortaleza; Variedade Massai.
Thesagro: | Gramínea forrageira; Panicum maximum; Pastagem.
Thesaurus Nal: | Brazil; Chlorophyll; Photosynthesis.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/42074/1/API-Gas-exchang-massai.pdf
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (24430-2) - UPC - AP - PP -  -  -  - DIS