Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities

Detalhes bibliográficos
Autor(a) principal: Costa, Newton de Lucena
Data de Publicação: 2020
Outros Autores: Jank, Liana, Magalhães, João Avelar, Bendahan, Amaury Bularmaqui, Rodrigues, Braz Henrique Nunes, Santos, Francisco José de Seixas
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Research, Society and Development
Texto Completo: https://rsdjournal.org/index.php/rsd/article/view/3284
Resumo: The effect of defoliation intensities (20, 30, 40 and 50 cm above soil level) on green dry matter (GDM) yield and morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário were evaluated under field conditions in Roraima´s savannas. The effects of defoliation intensities on the GDM yields, leaf area index and leaf elongation rates was adjusted to the quadratic regression model and maximum values recorded with cutting at 35.8; 44.9 and 30.2 cm above soil level, respectively. The tiller population density, number of leaves tiller-1 and leaf appearance rate was inversely proportional to the intensity of defoliation, while the opposite occurred for to average leaf length and leaf senescence rate. Apical meristem removal percentage was higher with increasing defoliation intensity. Vigor regrowth showed close negative correlation with defoliation intensity level. Pastures of M. maximus cv. Centenário managed under 30 to 35 cm residue provides higher forage productivity, larger efficiency of forage utilization, greater tissue renewal and canopy structure more favorable to grazing.
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spelling Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensitiesCaracterísticas morfogenéticas y estructurales de Megathyrsus maximus cv. Centenário bajo intensidades de defoliaciónCaracterísticas morfogênicas e estruturais de Megathyrsus maximus cv. Centenário sob intensidades de desfolhaçãoFolhasmatéria seca verdePerfilhamentoSenescência.Green dry matterleavesTillerSenescence.Hojasmateria seca verdeMacollamientoSenescenciaThe effect of defoliation intensities (20, 30, 40 and 50 cm above soil level) on green dry matter (GDM) yield and morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário were evaluated under field conditions in Roraima´s savannas. The effects of defoliation intensities on the GDM yields, leaf area index and leaf elongation rates was adjusted to the quadratic regression model and maximum values recorded with cutting at 35.8; 44.9 and 30.2 cm above soil level, respectively. The tiller population density, number of leaves tiller-1 and leaf appearance rate was inversely proportional to the intensity of defoliation, while the opposite occurred for to average leaf length and leaf senescence rate. Apical meristem removal percentage was higher with increasing defoliation intensity. Vigor regrowth showed close negative correlation with defoliation intensity level. Pastures of M. maximus cv. Centenário managed under 30 to 35 cm residue provides higher forage productivity, larger efficiency of forage utilization, greater tissue renewal and canopy structure more favorable to grazing.El efecto de la intensidad de defoliación (20, 30, 40 y 50 cm por encima del suelo) sobre la producción de forraje y características morfogenéticas y estructurales de Megathyrsus maximus cv. Centenário se evaluó en las sabanas de Roraima. Los efectos de las intensidades de defoliación sobre la producción de materia seca verde, índice de área foliar y tasa de expansión de hojas fueron ajustados al modelo cuadrático de regresión y los máximos valores registrados con cortes a 35,8; 44,9 y 30,2 cm por encima del suelo, respectivamente. La densidad poblacional de macollas, la tasa de aparición de hojas y el número de hojas macolla-1 fueron inversamente proporcional a la intensidad de defoliación, ocurriendo lo contrario en cuanto a la longitud media de las hojas y la tasa de senescencia foliar. La eliminación de meristemos apicales se incrementó con el aumento de la intensidad de defoliación. El vigor de rebrote fue directo y negativamente correlacionado con la intensidad de defoliación. Pastos de M. maximus cv. Centenário manejados bajo residuos de 30 a 35 cm proporcionan mayor productividad y eficiencia de utilización del forraje, mayor renovación de tejidos y estructura del dosel más favorable al pastoreo.O efeito de intensidades de desfolhação (20, 30, 40 e 50 cm acima do solo) sobre a produção de forragem e características morfogênicas e estruturais de Megathyrsus maximus cv. Centenário foi avaliado em condições de campo nos cerrados de Roraima. Os efeitos das intensidades de desfolhação sobre a produção de matéria seca verde, índice de área foliar e taxa de expansão de folhas foram ajustados ao modelo quadrático de regressão e os máximos valores registrados com cortes a 35,8; 44,9 e 30,2 cm acima do solo, respectivamente. A densidade populacional de perfilhos, taxa de aparecimento de folhas e número de folhas perfilho-1 foram inversamente proporcionais à intensidade de desfolhação, ocorrendo o inverso quanto ao comprimento médio de folhas e taxa de senescência foliar. A eliminação de meristemas apicais foi incrementada com o aumento da intensidade de desfolhação. O vigor de rebrota foi direta e negativamente correlacionado com a intensidade de desfolhação. Pastagens de M. maximus cv. Centenário manejadas sob resíduos entre 30 a 35 cm proporcionam maior produtividade e eficiência de utilização da forragem, maior renovação de tecidos e estrutura do dossel mais favorável ao pastejo.Research, Society and Development2020-03-31info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://rsdjournal.org/index.php/rsd/article/view/328410.33448/rsd-v9i5.3284Research, Society and Development; Vol. 9 No. 5; e120953284Research, Society and Development; Vol. 9 Núm. 5; e120953284Research, Society and Development; v. 9 n. 5; e1209532842525-3409reponame:Research, Society and Developmentinstname:Universidade Federal de Itajubá (UNIFEI)instacron:UNIFEIenghttps://rsdjournal.org/index.php/rsd/article/view/3284/4960Copyright (c) 2020 Newton de Lucena Costa, Liana Jank Jank, João Avelar Magalhães, Amaury Bularmaqui Bendahan, Braz Henrique Nunes Rodrigues, Francisco José de Seixas Santosinfo:eu-repo/semantics/openAccessCosta, Newton de LucenaJank, LianaMagalhães, João AvelarBendahan, Amaury BularmaquiRodrigues, Braz Henrique NunesSantos, Francisco José de Seixas2020-08-20T18:06:36Zoai:ojs.pkp.sfu.ca:article/3284Revistahttps://rsdjournal.org/index.php/rsd/indexPUBhttps://rsdjournal.org/index.php/rsd/oairsd.articles@gmail.com2525-34092525-3409opendoar:2024-01-17T09:27:32.235187Research, Society and Development - Universidade Federal de Itajubá (UNIFEI)false
dc.title.none.fl_str_mv Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities
Características morfogenéticas y estructurales de Megathyrsus maximus cv. Centenário bajo intensidades de defoliación
Características morfogênicas e estruturais de Megathyrsus maximus cv. Centenário sob intensidades de desfolhação
title Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities
spellingShingle Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities
Costa, Newton de Lucena
Folhas
matéria seca verde
Perfilhamento
Senescência.
Green dry matter
leaves
Tiller
Senescence.
Hojas
materia seca verde
Macollamiento
Senescencia
title_short Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities
title_full Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities
title_fullStr Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities
title_full_unstemmed Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities
title_sort Morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário under defoliation intensities
author Costa, Newton de Lucena
author_facet Costa, Newton de Lucena
Jank, Liana
Magalhães, João Avelar
Bendahan, Amaury Bularmaqui
Rodrigues, Braz Henrique Nunes
Santos, Francisco José de Seixas
author_role author
author2 Jank, Liana
Magalhães, João Avelar
Bendahan, Amaury Bularmaqui
Rodrigues, Braz Henrique Nunes
Santos, Francisco José de Seixas
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Costa, Newton de Lucena
Jank, Liana
Magalhães, João Avelar
Bendahan, Amaury Bularmaqui
Rodrigues, Braz Henrique Nunes
Santos, Francisco José de Seixas
dc.subject.por.fl_str_mv Folhas
matéria seca verde
Perfilhamento
Senescência.
Green dry matter
leaves
Tiller
Senescence.
Hojas
materia seca verde
Macollamiento
Senescencia
topic Folhas
matéria seca verde
Perfilhamento
Senescência.
Green dry matter
leaves
Tiller
Senescence.
Hojas
materia seca verde
Macollamiento
Senescencia
description The effect of defoliation intensities (20, 30, 40 and 50 cm above soil level) on green dry matter (GDM) yield and morphogenetic and structural characteristics of Megathyrsus maximus cv. Centenário were evaluated under field conditions in Roraima´s savannas. The effects of defoliation intensities on the GDM yields, leaf area index and leaf elongation rates was adjusted to the quadratic regression model and maximum values recorded with cutting at 35.8; 44.9 and 30.2 cm above soil level, respectively. The tiller population density, number of leaves tiller-1 and leaf appearance rate was inversely proportional to the intensity of defoliation, while the opposite occurred for to average leaf length and leaf senescence rate. Apical meristem removal percentage was higher with increasing defoliation intensity. Vigor regrowth showed close negative correlation with defoliation intensity level. Pastures of M. maximus cv. Centenário managed under 30 to 35 cm residue provides higher forage productivity, larger efficiency of forage utilization, greater tissue renewal and canopy structure more favorable to grazing.
publishDate 2020
dc.date.none.fl_str_mv 2020-03-31
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://rsdjournal.org/index.php/rsd/article/view/3284
10.33448/rsd-v9i5.3284
url https://rsdjournal.org/index.php/rsd/article/view/3284
identifier_str_mv 10.33448/rsd-v9i5.3284
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://rsdjournal.org/index.php/rsd/article/view/3284/4960
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 Research, Society and Development
publisher.none.fl_str_mv Research, Society and Development
dc.source.none.fl_str_mv Research, Society and Development; Vol. 9 No. 5; e120953284
Research, Society and Development; Vol. 9 Núm. 5; e120953284
Research, Society and Development; v. 9 n. 5; e120953284
2525-3409
reponame:Research, Society and Development
instname:Universidade Federal de Itajubá (UNIFEI)
instacron:UNIFEI
instname_str Universidade Federal de Itajubá (UNIFEI)
instacron_str UNIFEI
institution UNIFEI
reponame_str Research, Society and Development
collection Research, Society and Development
repository.name.fl_str_mv Research, Society and Development - Universidade Federal de Itajubá (UNIFEI)
repository.mail.fl_str_mv rsd.articles@gmail.com
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