Hoeing number and time for weed control in sunflower
Autor(a) principal: | |
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Data de Publicação: | 1991 |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/3492 |
Resumo: | Two field experiments were conducted in the Depressão Central region of Rio Grande do Sul State, Brazil, in order to establish correct time and hoeing number that would best fit the need of maintaining (Helianthus annuus L.) crop free of weed interference. The treatments tested were one, two, or three hoeings, 15 days apart, applied during a 30-day period in the first half of the crop cycle. Results showed that in the first year one hoeing, performed 20 or 35 days after sunflower emergence, was sufficient to maintain the crop free of weed interference, whilst in the second year two hoeings were needed to attain the same effect, the first one applied 15 days after emergence and the second 15 or 30 days later. One hoeing applied 45-50 days after emergence was not effective, since the sunflower plants did not recover from the initial effects of weed interference, resulting in grain yield decrease. |
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Hoeing number and time for weed control in sunflowerÉpoca e número de capinas para controle de plantas daninhas em girassolHelianthus annuus; mechanical control; weed interference; critical period of competitionHelianthus annuus; controle mecânico; interferência de plantas daninhas; período crítico de competiçãoTwo field experiments were conducted in the Depressão Central region of Rio Grande do Sul State, Brazil, in order to establish correct time and hoeing number that would best fit the need of maintaining (Helianthus annuus L.) crop free of weed interference. The treatments tested were one, two, or three hoeings, 15 days apart, applied during a 30-day period in the first half of the crop cycle. Results showed that in the first year one hoeing, performed 20 or 35 days after sunflower emergence, was sufficient to maintain the crop free of weed interference, whilst in the second year two hoeings were needed to attain the same effect, the first one applied 15 days after emergence and the second 15 or 30 days later. One hoeing applied 45-50 days after emergence was not effective, since the sunflower plants did not recover from the initial effects of weed interference, resulting in grain yield decrease.Foram realizados dois experimentos de campo na região da Depressão Central do Rio Grande do Sul com o objetivo de determinar a época adequada e o número de capinas que melhor atendessem a necessidade de manter a cultura do girassol (Helianthus annuus L.) livre da interferência de plantas daninhas com o mínimo de operações. Os tratamentos constaram de uma, duas ou três capinas, a intervalos de 15 dias, realizadas dentro de um período de 30 dias na primeira metade do ciclo da cultura. Os resultados mostraram que no primeiro ano apenas uma capina aos 20 ou 35 dias após emergência do girassol foi suficiente para manter a cultura livre dos efeitos de interferência das plantas daninhas. Já no segundo ano foram necessárias duas capinas para conseguir o mesmo efeito: a primeira, aplicada aos 15 dias e complementada com a segunda aos 30 ou 45 dias. Nos dois anos, a realização da capina aos 45-50 dias da emergência foi muito tardia, e o girassol não se recuperou dos danos iniciais da interferência, apresentando redução no rendimento de grãos.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraFleck, Nilson Gilberto1991-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/3492Pesquisa Agropecuaria Brasileira; v.26, n.9, set. 1991; 1509-1516Pesquisa Agropecuária Brasileira; v.26, n.9, set. 1991; 1509-15161678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/3492/825info:eu-repo/semantics/openAccess2009-12-23T15:17:44Zoai:ojs.seer.sct.embrapa.br:article/3492Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2009-12-23T15:17:44Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Hoeing number and time for weed control in sunflower Época e número de capinas para controle de plantas daninhas em girassol |
title |
Hoeing number and time for weed control in sunflower |
spellingShingle |
Hoeing number and time for weed control in sunflower Fleck, Nilson Gilberto Helianthus annuus; mechanical control; weed interference; critical period of competition Helianthus annuus; controle mecânico; interferência de plantas daninhas; período crítico de competição |
title_short |
Hoeing number and time for weed control in sunflower |
title_full |
Hoeing number and time for weed control in sunflower |
title_fullStr |
Hoeing number and time for weed control in sunflower |
title_full_unstemmed |
Hoeing number and time for weed control in sunflower |
title_sort |
Hoeing number and time for weed control in sunflower |
author |
Fleck, Nilson Gilberto |
author_facet |
Fleck, Nilson Gilberto |
author_role |
author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Fleck, Nilson Gilberto |
dc.subject.por.fl_str_mv |
Helianthus annuus; mechanical control; weed interference; critical period of competition Helianthus annuus; controle mecânico; interferência de plantas daninhas; período crítico de competição |
topic |
Helianthus annuus; mechanical control; weed interference; critical period of competition Helianthus annuus; controle mecânico; interferência de plantas daninhas; período crítico de competição |
description |
Two field experiments were conducted in the Depressão Central region of Rio Grande do Sul State, Brazil, in order to establish correct time and hoeing number that would best fit the need of maintaining (Helianthus annuus L.) crop free of weed interference. The treatments tested were one, two, or three hoeings, 15 days apart, applied during a 30-day period in the first half of the crop cycle. Results showed that in the first year one hoeing, performed 20 or 35 days after sunflower emergence, was sufficient to maintain the crop free of weed interference, whilst in the second year two hoeings were needed to attain the same effect, the first one applied 15 days after emergence and the second 15 or 30 days later. One hoeing applied 45-50 days after emergence was not effective, since the sunflower plants did not recover from the initial effects of weed interference, resulting in grain yield decrease. |
publishDate |
1991 |
dc.date.none.fl_str_mv |
1991-09-01 |
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/3492 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/3492 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/3492/825 |
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.26, n.9, set. 1991; 1509-1516 Pesquisa Agropecuária Brasileira; v.26, n.9, set. 1991; 1509-1516 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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1793416696778719232 |