Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira'
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S1806-66902010000300019 http://hdl.handle.net/11449/213125 |
Resumo: | This study aimed to determine the late-season presence of weeds in reddish brown cotton (cultivar BRS Safira) and the critical times for removing weeds. The experiment was carried out in the area of Embrapa in Missão Velha-CE, Brazil, located at 7º42'07 S latitude and 39º24'18 WGr. longitude, during the 2007/2008 season. The treatments consisted of two control groups: weed-free crop during the initial period after crop emergency, and crop kept with weeds during initial period after plant emergency. Both consisted, 0; 20; 40; 60; 80 e 120 days after crop emergency (DAE), the weed community was evaluated by two phytosociological indices (relative dominance and relative importance). Regression analysis was performed as the model of sigmoidal Boltzman, using data from productivity separately within each type of competition, to identify the critical periods of competition, considering 2; 5 and 10% reduction in yield. The community of weeds was composed by 21 species, standing out among them: Richardia grandiflora, Amaranthus deflexus, Eleusine indica, Merremia aegyptia, Eragrotis pilosa, Cenchrus echinatus and Waltheria indica. Considering 2; 5 and 10% reduction in yield fiber as acceptable, the critical period before weed interference were, respectively, 8; 14 and 20 DAE. The critical period of weed interference, for those same levels of losses, were respectively, 100; 82 and 60 days. |
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Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira'Weeds interference periods in naturally colored cotton 'BRS Safira'Gossypium hirsutum LRace latifoliumNaturally colored cottonsCompetitionGossypium hirsutum LRaça latifoliumFibra coloridaErvas daninhasCompetiçãoThis study aimed to determine the late-season presence of weeds in reddish brown cotton (cultivar BRS Safira) and the critical times for removing weeds. The experiment was carried out in the area of Embrapa in Missão Velha-CE, Brazil, located at 7º42'07 S latitude and 39º24'18 WGr. longitude, during the 2007/2008 season. The treatments consisted of two control groups: weed-free crop during the initial period after crop emergency, and crop kept with weeds during initial period after plant emergency. Both consisted, 0; 20; 40; 60; 80 e 120 days after crop emergency (DAE), the weed community was evaluated by two phytosociological indices (relative dominance and relative importance). Regression analysis was performed as the model of sigmoidal Boltzman, using data from productivity separately within each type of competition, to identify the critical periods of competition, considering 2; 5 and 10% reduction in yield. The community of weeds was composed by 21 species, standing out among them: Richardia grandiflora, Amaranthus deflexus, Eleusine indica, Merremia aegyptia, Eragrotis pilosa, Cenchrus echinatus and Waltheria indica. Considering 2; 5 and 10% reduction in yield fiber as acceptable, the critical period before weed interference were, respectively, 8; 14 and 20 DAE. The critical period of weed interference, for those same levels of losses, were respectively, 100; 82 and 60 days.Objetivou-se com esse trabalho, identificar os períodos de interferência das plantas daninhas no algodoeiro de fibra colorida (BRS Safira), bem como avaliar a comunidade infestante nesta cultura. O experimento foi realizado no município de Missão Velha, CE, região do Cariri, na safra 2007/2008. Utilizou-se o delineamento experimental em blocos ao acaso, com quatro repetições, em esquema fatorial 2 x 5, sendo os fatores: modalidades de competição (com e sem competição de plantas daninhas) e período de interferência das plantas daninhas. A comunidade infestante foi avaliada por meio de dois índices fitossociológicos (Dominância relativa e Importância relativa). Os períodos iniciais de controle ou de convivência após a emergência da cultura foram 0-20; 0-40; 0-60; 0-80 dias após a emergência (DAE) e 0-colheita. Os períodos de interferência foram determinados considerando-se perdas na produtividade de 2; 5 e 10%; realizando-se análise de regressão pelo modelo sigmoidal de Boltzman, utilizando-se os dados de produtividade para cada modalidade de competição. Dentre as 21 espécies observadas na comunidade infestante, destacaram-se: Richardia grandiflora, Amaranthus deflexus, Eleusine indica, Merremia aegyptia, Eragrotis pilosa, Cenchrus echinatus e Waltheria indica. Os períodos críticos anteriores à interferência foram, respectivamente, 8; 14 e 20 DAE, para perdas na produtividade de 2; 5 e 10%; e os períodos críticos de prevenção a interferências, foram, respectivamente, 100; 82 e 60 dias.Embrapa AlgodãoUniversidade Federal da Paraíba, CCAUniversidade Estadual Paulista, FCAVUniversidade Estadual Paulista, FCAVUniversidade Federal do CearáEmbrapa AlgodãoUniversidade Federal da ParaíbaUniversidade Estadual Paulista (Unesp)Cardoso, Gleibson DionízioAlves, Pedro Luís Da Costa Aguiar [UNESP]Beltrão, Napoleão Esberard De MacêdoVale, Leandro Silva Do2021-07-14T10:50:26Z2021-07-14T10:50:26Z2010-09info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article456-462application/pdfhttp://dx.doi.org/10.1590/S1806-66902010000300019Revista Ciência Agronômica. Fortaleza, CE, Brazil: Universidade Federal do Ceará, v. 41, n. 3, p. 456-462, 2010.0045-68881806-6690http://hdl.handle.net/11449/21312510.1590/S1806-66902010000300019S1806-66902010000300019S1806-66902010000300019.pdfSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporRevista Ciência Agronômicainfo:eu-repo/semantics/openAccess2023-10-02T06:03:34Zoai:repositorio.unesp.br:11449/213125Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-10-02T06:03:34Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira' Weeds interference periods in naturally colored cotton 'BRS Safira' |
title |
Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira' |
spellingShingle |
Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira' Cardoso, Gleibson Dionízio Gossypium hirsutum L Race latifolium Naturally colored cottons Competition Gossypium hirsutum L Raça latifolium Fibra colorida Ervas daninhas Competição |
title_short |
Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira' |
title_full |
Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira' |
title_fullStr |
Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira' |
title_full_unstemmed |
Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira' |
title_sort |
Períodos de interferência das plantas daninhas em algodoeiro de fibra colorida 'BRS Safira' |
author |
Cardoso, Gleibson Dionízio |
author_facet |
Cardoso, Gleibson Dionízio Alves, Pedro Luís Da Costa Aguiar [UNESP] Beltrão, Napoleão Esberard De Macêdo Vale, Leandro Silva Do |
author_role |
author |
author2 |
Alves, Pedro Luís Da Costa Aguiar [UNESP] Beltrão, Napoleão Esberard De Macêdo Vale, Leandro Silva Do |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Embrapa Algodão Universidade Federal da Paraíba Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Cardoso, Gleibson Dionízio Alves, Pedro Luís Da Costa Aguiar [UNESP] Beltrão, Napoleão Esberard De Macêdo Vale, Leandro Silva Do |
dc.subject.por.fl_str_mv |
Gossypium hirsutum L Race latifolium Naturally colored cottons Competition Gossypium hirsutum L Raça latifolium Fibra colorida Ervas daninhas Competição |
topic |
Gossypium hirsutum L Race latifolium Naturally colored cottons Competition Gossypium hirsutum L Raça latifolium Fibra colorida Ervas daninhas Competição |
description |
This study aimed to determine the late-season presence of weeds in reddish brown cotton (cultivar BRS Safira) and the critical times for removing weeds. The experiment was carried out in the area of Embrapa in Missão Velha-CE, Brazil, located at 7º42'07 S latitude and 39º24'18 WGr. longitude, during the 2007/2008 season. The treatments consisted of two control groups: weed-free crop during the initial period after crop emergency, and crop kept with weeds during initial period after plant emergency. Both consisted, 0; 20; 40; 60; 80 e 120 days after crop emergency (DAE), the weed community was evaluated by two phytosociological indices (relative dominance and relative importance). Regression analysis was performed as the model of sigmoidal Boltzman, using data from productivity separately within each type of competition, to identify the critical periods of competition, considering 2; 5 and 10% reduction in yield. The community of weeds was composed by 21 species, standing out among them: Richardia grandiflora, Amaranthus deflexus, Eleusine indica, Merremia aegyptia, Eragrotis pilosa, Cenchrus echinatus and Waltheria indica. Considering 2; 5 and 10% reduction in yield fiber as acceptable, the critical period before weed interference were, respectively, 8; 14 and 20 DAE. The critical period of weed interference, for those same levels of losses, were respectively, 100; 82 and 60 days. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-09 2021-07-14T10:50:26Z 2021-07-14T10:50:26Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S1806-66902010000300019 Revista Ciência Agronômica. Fortaleza, CE, Brazil: Universidade Federal do Ceará, v. 41, n. 3, p. 456-462, 2010. 0045-6888 1806-6690 http://hdl.handle.net/11449/213125 10.1590/S1806-66902010000300019 S1806-66902010000300019 S1806-66902010000300019.pdf |
url |
http://dx.doi.org/10.1590/S1806-66902010000300019 http://hdl.handle.net/11449/213125 |
identifier_str_mv |
Revista Ciência Agronômica. Fortaleza, CE, Brazil: Universidade Federal do Ceará, v. 41, n. 3, p. 456-462, 2010. 0045-6888 1806-6690 10.1590/S1806-66902010000300019 S1806-66902010000300019 S1806-66902010000300019.pdf |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Revista Ciência Agronômica |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
456-462 application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal do Ceará |
publisher.none.fl_str_mv |
Universidade Federal do Ceará |
dc.source.none.fl_str_mv |
SciELO reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1799964401691787264 |