Tiller size/density compensation in grazed Tifton 85 bermudagrass swards
Autor(a) principal: | |
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Data de Publicação: | 2003 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/6724 |
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. |
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Tiller size/density compensation in grazed Tifton 85 bermudagrass swardsCompensação tamanho/densidade populacional de perfilhos em pastos de Tifton 85Cynodon; leaf area index; mass; density; plant morphologyCynodon; índice de superfície foliar; massa; densidade; morfologia vegetalThe 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.O objetivo deste trabalho foi avaliar a ocorrência do mecanismo de compensação tamanho/densidade populacional de perfilhos em pastagens de Tifton 85 (Cynodon spp.). Os tratamentos corresponderam a quatro condições de pasto (5, 10, 15 e 20 cm de altura), mantidas constantes por ovinos em regime de lotação contínua e taxa de lotação variável. O delineamento experimental foi o de blocos completos casualizados com quatro repetições. As variáveis densidade populacional de perfilhos, massa por perfilho, massa de folha por perfilho, área foliar por perfilho, massa de forragem, volume por perfilho, índice de área foliar, relação folha/haste e razão entre área foliar/volume do perfilho (R) foram avaliadas. Além disso, regressões simples foram realizadas entre densidade populacional de perfilhos e massa por perfilho. As medições foram realizadas em dezembro de 1998 e janeiro, abril e julho de 1999. Os resultados mostraram que pastagens de Cynodon spp. apresentaram um mecanismo de compensação tamanho/densidade populacional de perfilhos, em que maiores densidades populacionais estiveram associadas a perfilhos pequenos e vice-versa, exceto em julho de 1999. Análises de regressão mostraram coeficientes lineares menores que a expectativa teórica de -3/2. Aumentos em massa de forragem em dezembro e janeiro resultaram de aumentos em massa por perfilho. Os valores de R foram menores que aqueles encontrados para plantas de clima temperado, indicando um maior nível de integração clonal entre plantas de Tifton 85.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraSbrissia, André FischerSilva, Sila Caneiro daMatthew, CoryCarvalho, Carlos Augusto Brandão deCarnevalli, Roberta AparecidaPinto, Luiz Felipe de MouraFagundes, Jailson LaraPedreira, Carlos Guilherme Silveira2003-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/6724Pesquisa Agropecuaria Brasileira; v.38, n.12, dez. 2003; 1459-1468Pesquisa Agropecuária Brasileira; v.38, n.12, dez. 2003; 1459-14681678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAenghttps://seer.sct.embrapa.br/index.php/pab/article/view/6724/3781info:eu-repo/semantics/openAccess2014-08-12T16:16:36Zoai:ojs.seer.sct.embrapa.br:article/6724Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-08-12T16:16:36Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Tiller size/density compensation in grazed Tifton 85 bermudagrass swards Compensação tamanho/densidade populacional de perfilhos em pastos de Tifton 85 |
title |
Tiller size/density compensation in grazed Tifton 85 bermudagrass swards |
spellingShingle |
Tiller size/density compensation in grazed Tifton 85 bermudagrass swards Sbrissia, André Fischer Cynodon; leaf area index; mass; density; plant morphology Cynodon; índice de superfície foliar; massa; densidade; morfologia vegetal |
title_short |
Tiller size/density compensation in grazed Tifton 85 bermudagrass swards |
title_full |
Tiller size/density compensation in grazed Tifton 85 bermudagrass swards |
title_fullStr |
Tiller size/density compensation in grazed Tifton 85 bermudagrass swards |
title_full_unstemmed |
Tiller size/density compensation in grazed Tifton 85 bermudagrass swards |
title_sort |
Tiller size/density compensation in grazed Tifton 85 bermudagrass swards |
author |
Sbrissia, André Fischer |
author_facet |
Sbrissia, André Fischer Silva, Sila Caneiro da Matthew, Cory Carvalho, Carlos Augusto Brandão de Carnevalli, Roberta Aparecida Pinto, Luiz Felipe de Moura Fagundes, Jailson Lara Pedreira, Carlos Guilherme Silveira |
author_role |
author |
author2 |
Silva, Sila Caneiro da Matthew, Cory Carvalho, Carlos Augusto Brandão de Carnevalli, Roberta Aparecida Pinto, Luiz Felipe de Moura Fagundes, Jailson Lara Pedreira, Carlos Guilherme Silveira |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Sbrissia, André Fischer Silva, Sila Caneiro da Matthew, Cory Carvalho, Carlos Augusto Brandão de Carnevalli, Roberta Aparecida Pinto, Luiz Felipe de Moura Fagundes, Jailson Lara Pedreira, Carlos Guilherme Silveira |
dc.subject.por.fl_str_mv |
Cynodon; leaf area index; mass; density; plant morphology Cynodon; índice de superfície foliar; massa; densidade; morfologia vegetal |
topic |
Cynodon; leaf area index; mass; density; plant morphology Cynodon; índice de superfície foliar; massa; densidade; morfologia vegetal |
description |
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. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-12-01 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/6724 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/6724 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/6724/3781 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.38, n.12, dez. 2003; 1459-1468 Pesquisa Agropecuária Brasileira; v.38, n.12, dez. 2003; 1459-1468 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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1793416695314907136 |