Chemical control of signalgrass in alfalfa crops
Autor(a) principal: | |
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Data de Publicação: | 2017 |
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/23498 |
Resumo: | The use of herbicides to control grass in Medicago sativa (alfalfa) pastures is still incipient. Therefore, the objective of this study was to evaluate the efficiency of fluazifop-p-butyl in the control of Brachiaria decumbens (signalgrass) in alfalfa. Thus, randomized block design was used, with seven doses of fluazifop-p-butyl (0, 25, 50, 100, 200, 300, 400 g ha-1), and four replications. Herbicide application was performed when the plants had about 20 cm height. Chlorophyll fluorescence, control of signalgrass and alfalfa toxicity were evaluated at 7, 15 e 30 days after application (DAA) and, at 45 DAA and 45 days after cut (DAC), both species were cut and tiller density, as well as branches and dry matter of forage species, were determined. Fluazifop-p-butyl does not affect the integrity of the photosynthetic apparatus of alfalfa plants, due to high tolerance to this mechanism of action presented by dicotyledonous species. However, signalgrass had physiological variables negatively affected by the herbicide, indicating the presence of physiological stress, even at the lowest doses of the product. The dose of 50 g ha-1 of fluazifop-p-butyl is effective in controlling signalgrass, without causing physiological and growth damage in alfalfa plants. |
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Semina. Ciências Agrárias (Online) |
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Chemical control of signalgrass in alfalfa cropsControle químico do capim-braquiária em cultivo de alfafaPhotosynthesisChlorophyll a fluorescenceFluazifop-p-butylMedicago sativaElectron transport rate.FotossínteseFluorescência da clorofila aFluazifop p-butilMedicago sativaTaxa de transporte de elétrons.The use of herbicides to control grass in Medicago sativa (alfalfa) pastures is still incipient. Therefore, the objective of this study was to evaluate the efficiency of fluazifop-p-butyl in the control of Brachiaria decumbens (signalgrass) in alfalfa. Thus, randomized block design was used, with seven doses of fluazifop-p-butyl (0, 25, 50, 100, 200, 300, 400 g ha-1), and four replications. Herbicide application was performed when the plants had about 20 cm height. Chlorophyll fluorescence, control of signalgrass and alfalfa toxicity were evaluated at 7, 15 e 30 days after application (DAA) and, at 45 DAA and 45 days after cut (DAC), both species were cut and tiller density, as well as branches and dry matter of forage species, were determined. Fluazifop-p-butyl does not affect the integrity of the photosynthetic apparatus of alfalfa plants, due to high tolerance to this mechanism of action presented by dicotyledonous species. However, signalgrass had physiological variables negatively affected by the herbicide, indicating the presence of physiological stress, even at the lowest doses of the product. The dose of 50 g ha-1 of fluazifop-p-butyl is effective in controlling signalgrass, without causing physiological and growth damage in alfalfa plants.O uso de herbicidas no controle de gramíneas em pastagens de Medicago sativa (alfafa) ainda é incipiente, desse modo objetivou-se avaliar a eficiência do fluazifop-p-butil no controle de Brachiaria decumbens (capim-braquiária) em alfafa. Para tal utilizou-se o delineamento em blocos casualisados, com sete doses de fluazifop-p-butil (0, 25, 50, 100, 200, 300, 400 g ha-1), e quatro repetições. A aplicação do herbicida foi realizada quando as plantas apresentavam cerca de 20 cm de altura. Foram realizadas avaliações de fluorescência da clorofila, controle do capim-braquiária e intoxicação da alfafa aos 7, 15 e 30 dias após aplicação (DAA) e aos 45 DAA e 45 dias após o corte (DAC) ambas as espécies foram cortadas e determinadas a densidade de perfilhos e ramificações e a massa seca das espécies forrageiras. O fluazifop-p-butil não afeta a integridade do aparato fotossintético de plantas da alfafa, devido à grande tolerância a esse mecanismo de ação apresentado por espécies dicotiledôneas. O capim-braquiária teve as variáveis fisiológicas afetadas negativamente pelo herbicida, indicando a presença de estresse fisiológico, mesmo nas menores doses do produto. A dose de 50 g ha-1 de fluazifop-p-butil é eficiente no controle de capim-braquiária, sem causar danos fisiológicos e no crescimento de plantas de alfafa.UEL2017-11-23info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionPesquisa de campoapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/2349810.5433/1679-0359.2017v38n6p3695Semina: Ciências Agrárias; Vol. 38 No. 6 (2017); 3695-3704Semina: Ciências Agrárias; v. 38 n. 6 (2017); 3695-37041679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/23498/22315Copyright (c) 2017 Semina: Ciências Agráriashttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessDias, Renan CoelhoSantos, Márcia VitóriaOliveira, Fabiana Lopes Ramos deFerreira, Evander AlvesSantos, José Barbosa dosRodrigues, Bárbara MartinsMartins, Cézar Augusto2022-10-21T13:04:22Zoai:ojs.pkp.sfu.ca:article/23498Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2022-10-21T13:04:22Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false |
dc.title.none.fl_str_mv |
Chemical control of signalgrass in alfalfa crops Controle químico do capim-braquiária em cultivo de alfafa |
title |
Chemical control of signalgrass in alfalfa crops |
spellingShingle |
Chemical control of signalgrass in alfalfa crops Dias, Renan Coelho Photosynthesis Chlorophyll a fluorescence Fluazifop-p-butyl Medicago sativa Electron transport rate. Fotossíntese Fluorescência da clorofila a Fluazifop p-butil Medicago sativa Taxa de transporte de elétrons. |
title_short |
Chemical control of signalgrass in alfalfa crops |
title_full |
Chemical control of signalgrass in alfalfa crops |
title_fullStr |
Chemical control of signalgrass in alfalfa crops |
title_full_unstemmed |
Chemical control of signalgrass in alfalfa crops |
title_sort |
Chemical control of signalgrass in alfalfa crops |
author |
Dias, Renan Coelho |
author_facet |
Dias, Renan Coelho Santos, Márcia Vitória Oliveira, Fabiana Lopes Ramos de Ferreira, Evander Alves Santos, José Barbosa dos Rodrigues, Bárbara Martins Martins, Cézar Augusto |
author_role |
author |
author2 |
Santos, Márcia Vitória Oliveira, Fabiana Lopes Ramos de Ferreira, Evander Alves Santos, José Barbosa dos Rodrigues, Bárbara Martins Martins, Cézar Augusto |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Dias, Renan Coelho Santos, Márcia Vitória Oliveira, Fabiana Lopes Ramos de Ferreira, Evander Alves Santos, José Barbosa dos Rodrigues, Bárbara Martins Martins, Cézar Augusto |
dc.subject.por.fl_str_mv |
Photosynthesis Chlorophyll a fluorescence Fluazifop-p-butyl Medicago sativa Electron transport rate. Fotossíntese Fluorescência da clorofila a Fluazifop p-butil Medicago sativa Taxa de transporte de elétrons. |
topic |
Photosynthesis Chlorophyll a fluorescence Fluazifop-p-butyl Medicago sativa Electron transport rate. Fotossíntese Fluorescência da clorofila a Fluazifop p-butil Medicago sativa Taxa de transporte de elétrons. |
description |
The use of herbicides to control grass in Medicago sativa (alfalfa) pastures is still incipient. Therefore, the objective of this study was to evaluate the efficiency of fluazifop-p-butyl in the control of Brachiaria decumbens (signalgrass) in alfalfa. Thus, randomized block design was used, with seven doses of fluazifop-p-butyl (0, 25, 50, 100, 200, 300, 400 g ha-1), and four replications. Herbicide application was performed when the plants had about 20 cm height. Chlorophyll fluorescence, control of signalgrass and alfalfa toxicity were evaluated at 7, 15 e 30 days after application (DAA) and, at 45 DAA and 45 days after cut (DAC), both species were cut and tiller density, as well as branches and dry matter of forage species, were determined. Fluazifop-p-butyl does not affect the integrity of the photosynthetic apparatus of alfalfa plants, due to high tolerance to this mechanism of action presented by dicotyledonous species. However, signalgrass had physiological variables negatively affected by the herbicide, indicating the presence of physiological stress, even at the lowest doses of the product. The dose of 50 g ha-1 of fluazifop-p-butyl is effective in controlling signalgrass, without causing physiological and growth damage in alfalfa plants. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-11-23 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Pesquisa de campo |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/23498 10.5433/1679-0359.2017v38n6p3695 |
url |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/23498 |
identifier_str_mv |
10.5433/1679-0359.2017v38n6p3695 |
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/23498/22315 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2017 Semina: Ciências Agrárias http://creativecommons.org/licenses/by-nc/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2017 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. 38 No. 6 (2017); 3695-3704 Semina: Ciências Agrárias; v. 38 n. 6 (2017); 3695-3704 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_ |
1799306075066859520 |