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Provedor de dados:  PAB
País:  Brazil
Título:  Tiller size/density compensation in grazed Tifton 85 bermudagrass swards
Autores:  Sbrissia,André Fischer
Silva,Sila Carneiro da
Matthew,Cory
Carvalho,Carlos Augusto Brandão de
Carnevalli,Roberta Aparecida
Pinto,Luiz Felipe de Moura
Fagundes,Jaílson Lara
Pedreira,Carlos Guilherme Silveira
Data:  2003-12-01
Ano:  2003
Palavras-chave:  Cynodon
Leaf area index
Mass
Density
Plant morphology
Resumo:  The objective of this study was to evaluate the occurrence of the tiller size/density compensation mechanism in Tifton 85 bermudagrass swards grazed by sheep under continuous stocking. Treatments corresponded to four sward steady state conditions (5, 10, 15, and 20 cm of sward surface height), maintained by sheep grazing. The experimental design was a complete randomized block with four replicates. Pasture responses evaluated include: tiller population density, tiller mass, leaf mass and leaf area per tiller, and herbage mass. Tiller volume, leaf area index, tiller leaf/stem ratio, and tiller leaf area/volume ratio were calculated and simple regression analyses between tiller population density and tiller mass were performed. Measurements were made in December, 1998, and January, April, and July, 1999. The swards showed a tiller size/density compensation mechanism in which high tiller population densities were associated with small tillers and vice-versa, except in July, 1999. Regression analyses revealed that linear coefficients were steeper than the theoretical expectation of -3/2. Increments in herbage mass were attributable to increases in tiller mass in December and January. Leaf area/volume ratio values of Tifton 85 tillers were much lower than those commonly found for temperate grass species.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003001200013
Editor:  Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira
Relação:  10.1590/S0100-204X2003001200013
Formato:  text/html
Fonte:  Pesquisa Agropecuária Brasileira v.38 n.12 2003
Direitos:  info:eu-repo/semantics/openAccess
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