Determination of the critical period of weed control in corn using a thermal basis
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | , |
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/5158 |
Resumo: | Field studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period of weed control in maize (Zea mays L.). The treatments consisted of two different periods of weed interference, a critical weed-free period, and a critical time of weed removal. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free and the critical time of weed removal, respectively. Accumulated thermal units were used to describe each period of weed-free or weed removal. The critical weed-free period and the critical time of weed removal ranged from 222 to 416 and 128 to 261 accumulated thermal units respectively, to prevent yield losses of 2.5%. Weed biomass proved to be inverse to the crop yield for all the years studied. When weeds competed with the crop from emergence, a large increase in weed biomass was achieved 10 days after crop emergence. However, few weed seedlings emerged and prospered after the 5-6 leaf maize stage (10-20 days after emergence). |
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Determination of the critical period of weed control in corn using a thermal basisDeterminação do período crítico de controle de plantas daninhas em milho utilizando uma base térmicaweed interference; weed management; accumulated thermal units; nonlinear regressioninterferência de plantas daninhas; manejo de plantas daninhas; unidades térmicas acumuladas; regressão não-linearField studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period of weed control in maize (Zea mays L.). The treatments consisted of two different periods of weed interference, a critical weed-free period, and a critical time of weed removal. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free and the critical time of weed removal, respectively. Accumulated thermal units were used to describe each period of weed-free or weed removal. The critical weed-free period and the critical time of weed removal ranged from 222 to 416 and 128 to 261 accumulated thermal units respectively, to prevent yield losses of 2.5%. Weed biomass proved to be inverse to the crop yield for all the years studied. When weeds competed with the crop from emergence, a large increase in weed biomass was achieved 10 days after crop emergence. However, few weed seedlings emerged and prospered after the 5-6 leaf maize stage (10-20 days after emergence).Conduziram-se estudos no campo durante três anos no sudeste da Província de Buenos Aires, Argentina, para determinar o período crítico de controle de plantas daninhas no milho. Os tratamentos consistiram de dois períodos diferentes de interferência das plantas daninhas: um período crítico livre de plantas daninhas, e um período crítico de remoção de plantas daninhas. O período crítico livre de plantas daninhas foi ajustado por meio da equação Gompertz, enquanto o período crítico de remoção de plantas daninhas foi ajustado mediante a equação logística. Foram utilizadas as unidades térmicas para descrever cada período de interferência de plantas daninhas. O período crítico livre e o período crítico de remoção de plantas daninhas variaram de 222 a 416 e de 128 a 261 unidades térmicas acumuladas, respectivamente, para impedir uma perda de rendimento de 2,5%. A biomassa das plantas daninhas variou ao contrário do rendimento do cultivo, em todos os anos estudados. Quando as plantas daninhas competiram com o cultivo desde a emergência, foi alcançado um grande incremento de biomassa aos dez dias após a emergência do cultivo. Porém, poucas plântulas de plantas daninhas emergiram e prosperaram depois do estádio de 5-6 folhas de milho (10-20 dias após a emergência).Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraBedmar, FranciscoManetti, PabloMonterubbianesi, Gloria1999-02-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/5158Pesquisa Agropecuaria Brasileira; v.34, n.2, fev. 1999; 187-193Pesquisa Agropecuária Brasileira; v.34, n.2, fev. 1999; 187-1931678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/5158/2350info:eu-repo/semantics/openAccess2010-07-13T16:35:00Zoai:ojs.seer.sct.embrapa.br:article/5158Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2010-07-13T16:35Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Determination of the critical period of weed control in corn using a thermal basis Determinação do período crítico de controle de plantas daninhas em milho utilizando uma base térmica |
title |
Determination of the critical period of weed control in corn using a thermal basis |
spellingShingle |
Determination of the critical period of weed control in corn using a thermal basis Bedmar, Francisco weed interference; weed management; accumulated thermal units; nonlinear regression interferência de plantas daninhas; manejo de plantas daninhas; unidades térmicas acumuladas; regressão não-linear |
title_short |
Determination of the critical period of weed control in corn using a thermal basis |
title_full |
Determination of the critical period of weed control in corn using a thermal basis |
title_fullStr |
Determination of the critical period of weed control in corn using a thermal basis |
title_full_unstemmed |
Determination of the critical period of weed control in corn using a thermal basis |
title_sort |
Determination of the critical period of weed control in corn using a thermal basis |
author |
Bedmar, Francisco |
author_facet |
Bedmar, Francisco Manetti, Pablo Monterubbianesi, Gloria |
author_role |
author |
author2 |
Manetti, Pablo Monterubbianesi, Gloria |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Bedmar, Francisco Manetti, Pablo Monterubbianesi, Gloria |
dc.subject.por.fl_str_mv |
weed interference; weed management; accumulated thermal units; nonlinear regression interferência de plantas daninhas; manejo de plantas daninhas; unidades térmicas acumuladas; regressão não-linear |
topic |
weed interference; weed management; accumulated thermal units; nonlinear regression interferência de plantas daninhas; manejo de plantas daninhas; unidades térmicas acumuladas; regressão não-linear |
description |
Field studies were conducted over 3 years in southeast Buenos Aires, Argentina, to determine the critical period of weed control in maize (Zea mays L.). The treatments consisted of two different periods of weed interference, a critical weed-free period, and a critical time of weed removal. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free and the critical time of weed removal, respectively. Accumulated thermal units were used to describe each period of weed-free or weed removal. The critical weed-free period and the critical time of weed removal ranged from 222 to 416 and 128 to 261 accumulated thermal units respectively, to prevent yield losses of 2.5%. Weed biomass proved to be inverse to the crop yield for all the years studied. When weeds competed with the crop from emergence, a large increase in weed biomass was achieved 10 days after crop emergence. However, few weed seedlings emerged and prospered after the 5-6 leaf maize stage (10-20 days after emergence). |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-02-01 |
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/5158 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/5158 |
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/5158/2350 |
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.34, n.2, fev. 1999; 187-193 Pesquisa Agropecuária Brasileira; v.34, n.2, fev. 1999; 187-193 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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1793416706187591680 |