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Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Gas exchange in massai grass under five nitrogen fertilization levels during establishment and regrowth.
Autores:  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.
Data:  2011-09-02
Ano:  2011
Palavras-chave:  Panicum maximum
Pastagem
Gramínea forrageira
Variedade Massai
Chlorophyll
Photosynthesis
Brazil
Ceará
Fortaleza
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 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.

2011
Tipo:  Artigo em periódico indexado (ALICE)
Idioma:  Português
Identificador:  24430

http://www.alice.cnptia.embrapa.br/handle/doc/899510

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/42074/1/API-Gas-exchang-massai.pdf
Editor:  Revista Brasileira de Zootecnia, Viçosa, MG, v. 40, n. 9, p. 1862-1869, 2011.
Relação:  Embrapa Caprinos e Ovinos - Artigo em periódico indexado (ALICE)
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