Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Semina. Ciências Agrárias (Online) |
Texto Completo: | https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/30734 |
Resumo: | The goal of this study was to evaluate the morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization. The experimental design was a completely randomized 4 × 2 split-plot design with four blocks. The treatments consisted of combinations of two rest periods (28 days - RPFixed - and height of 40 cm - RPVar) and four nitrogen doses (0, 150, 300, and 450 kg N ha-1 year-1) applied as ammonium sulfate. The following variables were analyzed: leaf appearance rate (LAR), phyllochron, leaf elongation rate (LER), stem elongation rate (SER), leaf senescence rate (LSR), leaf life span (LLS), average length of leaf blade (ALLB), sheath length (SL), number of live and dead leaves (NLL and NDL), and tiller population density (TPD). The variables LAR, LER, SER, ALLB and SL presented positive linear relationships with RPFixed and a quadratic relationship with RPVar, considering the application of the N doses. As for phyllochron and LLS, a negative linear relationship was observed with RPFixed and a quadratic relationship with RPVar. The N doses caused an effect on LSR, following the quadratic model for both rest periods studied. NLL and NDL exhibited linear effects on RPVar. The best indexes for the rest period variable were obtained when nitrogen was applied in the range of 280 to 333 kg ha-1, whereas the dose of 450 kg ha-1 of N provided desired results when using a fixed rest period. The rest period alleviated the process of senescence, especially given the application of higher nitrogen doses. |
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Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilizationCaracterísticas morfogênicas e estruturais do capim Marandu sob estratégias de manejo de pastejo e adubação nitrogenadaUrochloa brizantha ‘MaranduIntermittent stockingFixed and variable rest periods.Urochloa brizantha cvMaranduLotação intermitentePeríodo de descanso fixo e variável.The goal of this study was to evaluate the morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization. The experimental design was a completely randomized 4 × 2 split-plot design with four blocks. The treatments consisted of combinations of two rest periods (28 days - RPFixed - and height of 40 cm - RPVar) and four nitrogen doses (0, 150, 300, and 450 kg N ha-1 year-1) applied as ammonium sulfate. The following variables were analyzed: leaf appearance rate (LAR), phyllochron, leaf elongation rate (LER), stem elongation rate (SER), leaf senescence rate (LSR), leaf life span (LLS), average length of leaf blade (ALLB), sheath length (SL), number of live and dead leaves (NLL and NDL), and tiller population density (TPD). The variables LAR, LER, SER, ALLB and SL presented positive linear relationships with RPFixed and a quadratic relationship with RPVar, considering the application of the N doses. As for phyllochron and LLS, a negative linear relationship was observed with RPFixed and a quadratic relationship with RPVar. The N doses caused an effect on LSR, following the quadratic model for both rest periods studied. NLL and NDL exhibited linear effects on RPVar. The best indexes for the rest period variable were obtained when nitrogen was applied in the range of 280 to 333 kg ha-1, whereas the dose of 450 kg ha-1 of N provided desired results when using a fixed rest period. The rest period alleviated the process of senescence, especially given the application of higher nitrogen doses.Objetivou-se avaliar as características morfogênicas e estruturais do capim Marandu submetido a estratégias de pastejo e adubação nitrogenada. Realizou-se o experimento em delineamento em blocos casualizados com parcelas subdivididas 4x2 com 4 blocos. Os tratamentos foram combinações entre dois períodos de descanso (28 dias - PDFixo - e altura de 40 cm - PDVar) e quatro doses de nitrogênio (0, 150, 300 e 450 kg N ha-1 ano-1), sendo o N aplicado na forma de sulfato de amônio. As variáveis analisadas foram: taxa de aparecimento foliar (TApF), filocrono, taxa de alongamento foliar (TAlF), taxa de alongamento de colmo (TAlC), taxa de senescência foliar (TSF), duração de vida foliar (DVF), comprimento médio de lâmina foliar (CMLF), comprimento de bainha (CB), número de folhas vivas e mortas (NFV e NFM) e densidade populacional de perfilhos (DPP). As variáveis TApF, TAlF, TAlC, CMLF e CB apresentaram comportamento linear positivo para PDFixo e quadrático para PDVar com aplicação das doses de N. Filocrono e DVF apresentaram comportamento linear negativo para PDFixo e quadrático para PDVar. A TSF apresentou efeito com as doses de N, enquadrando-se no modelo quadrático para ambas as formas de período de descanso. NFV e NFM apresentaram efeito linear para PDVar. Os melhores índices para período de descanso variável foram obtidos quando houve aplicação de nitrogênio na faixa de 280 a 333 kg ha-1, enquanto a dose de 450 kg de N ha-1 obteve resultados desejados quando se utiliza período de descanso fixo. O uso de período de descanso variável amenizou o processo de senescência, que fora impulsionado com a aplicação de maiores doses de nitrogênio.UEL2019-08-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/3073410.5433/1679-0359.2019v40n5Supl1p2331Semina: Ciências Agrárias; Vol. 40 No. 5Supl1 (2019); 2331-2340Semina: Ciências Agrárias; v. 40 n. 5Supl1 (2019); 2331-23401679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/30734/25853Copyright (c) 2019 Semina: Ciências Agráriashttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessRodrigues, Luan FernandesSantos, Antonio Clementino dosSilveira Junior, OtacílioSantos, José Geraldo Donizetti dosFaria, Ana Flávia Gouveia deCoelho, Bárbara Pércya Lopes2022-10-18T16:37:06Zoai:ojs.pkp.sfu.ca:article/30734Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2022-10-18T16:37:06Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false |
dc.title.none.fl_str_mv |
Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization Características morfogênicas e estruturais do capim Marandu sob estratégias de manejo de pastejo e adubação nitrogenada |
title |
Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization |
spellingShingle |
Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization Rodrigues, Luan Fernandes Urochloa brizantha ‘Marandu Intermittent stocking Fixed and variable rest periods. Urochloa brizantha cv Marandu Lotação intermitente Período de descanso fixo e variável. |
title_short |
Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization |
title_full |
Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization |
title_fullStr |
Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization |
title_full_unstemmed |
Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization |
title_sort |
Morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization |
author |
Rodrigues, Luan Fernandes |
author_facet |
Rodrigues, Luan Fernandes Santos, Antonio Clementino dos Silveira Junior, Otacílio Santos, José Geraldo Donizetti dos Faria, Ana Flávia Gouveia de Coelho, Bárbara Pércya Lopes |
author_role |
author |
author2 |
Santos, Antonio Clementino dos Silveira Junior, Otacílio Santos, José Geraldo Donizetti dos Faria, Ana Flávia Gouveia de Coelho, Bárbara Pércya Lopes |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Rodrigues, Luan Fernandes Santos, Antonio Clementino dos Silveira Junior, Otacílio Santos, José Geraldo Donizetti dos Faria, Ana Flávia Gouveia de Coelho, Bárbara Pércya Lopes |
dc.subject.por.fl_str_mv |
Urochloa brizantha ‘Marandu Intermittent stocking Fixed and variable rest periods. Urochloa brizantha cv Marandu Lotação intermitente Período de descanso fixo e variável. |
topic |
Urochloa brizantha ‘Marandu Intermittent stocking Fixed and variable rest periods. Urochloa brizantha cv Marandu Lotação intermitente Período de descanso fixo e variável. |
description |
The goal of this study was to evaluate the morphogenic and structural characteristics of Marandu grass cultivated under grazing management and nitrogen fertilization. The experimental design was a completely randomized 4 × 2 split-plot design with four blocks. The treatments consisted of combinations of two rest periods (28 days - RPFixed - and height of 40 cm - RPVar) and four nitrogen doses (0, 150, 300, and 450 kg N ha-1 year-1) applied as ammonium sulfate. The following variables were analyzed: leaf appearance rate (LAR), phyllochron, leaf elongation rate (LER), stem elongation rate (SER), leaf senescence rate (LSR), leaf life span (LLS), average length of leaf blade (ALLB), sheath length (SL), number of live and dead leaves (NLL and NDL), and tiller population density (TPD). The variables LAR, LER, SER, ALLB and SL presented positive linear relationships with RPFixed and a quadratic relationship with RPVar, considering the application of the N doses. As for phyllochron and LLS, a negative linear relationship was observed with RPFixed and a quadratic relationship with RPVar. The N doses caused an effect on LSR, following the quadratic model for both rest periods studied. NLL and NDL exhibited linear effects on RPVar. The best indexes for the rest period variable were obtained when nitrogen was applied in the range of 280 to 333 kg ha-1, whereas the dose of 450 kg ha-1 of N provided desired results when using a fixed rest period. The rest period alleviated the process of senescence, especially given the application of higher nitrogen doses. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-08-07 |
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://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/30734 10.5433/1679-0359.2019v40n5Supl1p2331 |
url |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/30734 |
identifier_str_mv |
10.5433/1679-0359.2019v40n5Supl1p2331 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/30734/25853 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2019 Semina: Ciências Agrárias http://creativecommons.org/licenses/by-nc/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2019 Semina: Ciências Agrárias http://creativecommons.org/licenses/by-nc/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
UEL |
publisher.none.fl_str_mv |
UEL |
dc.source.none.fl_str_mv |
Semina: Ciências Agrárias; Vol. 40 No. 5Supl1 (2019); 2331-2340 Semina: Ciências Agrárias; v. 40 n. 5Supl1 (2019); 2331-2340 1679-0359 1676-546X reponame:Semina. Ciências Agrárias (Online) instname:Universidade Estadual de Londrina (UEL) instacron:UEL |
instname_str |
Universidade Estadual de Londrina (UEL) |
instacron_str |
UEL |
institution |
UEL |
reponame_str |
Semina. Ciências Agrárias (Online) |
collection |
Semina. Ciências Agrárias (Online) |
repository.name.fl_str_mv |
Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL) |
repository.mail.fl_str_mv |
semina.agrarias@uel.br |
_version_ |
1799306078483120128 |