Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice
Autor(a) principal: | |
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Data de Publicação: | 2005 |
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/6913 |
Resumo: | The economic thresholds (ET) for weedy rice infestations in rice fields allow to decide the management of the rice crop, rationalizing herbicide use. The aim of this research was to estimate ET for red rice and for EEA 406 rice cultivar, mimicking red rice, when competing with flooded rice. Three field experiments were carried out, during the 1999/2000 and 2000/2001 growing seasons. The investigated factors were populations of the concurrents genotypes on the three experiments and red rice relative emergence times (first study), EEA 406 rice cultivar (second study) and rice cultivars and row widths (third experiment). ET values for red rice were lower than those for EEA 406 genotype. The ET values estimated for EEA 406 varied widely, according to environment (seasons), emergence time, rice cultivar and row width variables. Earlier emergence of concurrent genotypes in relation to the crop, increase in row width, and use of very early maturity cultivars decreased the ET values. Increases in grain yield, selling rice price and in control efficiency, and control cost reduction, decreased ET levels, making cost effective the adoption of management practices under lower concurrent genotype populations. |
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Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded riceDano econômico como critério na decisão sobre manejo de genótipos de arroz concorrentes em arroz irrigadoOryza sativa; interference; economic analysis; mathematical modelsOryza sativa; interferência; análise econômica; modelagem matemáticaThe economic thresholds (ET) for weedy rice infestations in rice fields allow to decide the management of the rice crop, rationalizing herbicide use. The aim of this research was to estimate ET for red rice and for EEA 406 rice cultivar, mimicking red rice, when competing with flooded rice. Three field experiments were carried out, during the 1999/2000 and 2000/2001 growing seasons. The investigated factors were populations of the concurrents genotypes on the three experiments and red rice relative emergence times (first study), EEA 406 rice cultivar (second study) and rice cultivars and row widths (third experiment). ET values for red rice were lower than those for EEA 406 genotype. The ET values estimated for EEA 406 varied widely, according to environment (seasons), emergence time, rice cultivar and row width variables. Earlier emergence of concurrent genotypes in relation to the crop, increase in row width, and use of very early maturity cultivars decreased the ET values. Increases in grain yield, selling rice price and in control efficiency, and control cost reduction, decreased ET levels, making cost effective the adoption of management practices under lower concurrent genotype populations.Os níveis de dano econômico (NDE) em infestações de arroz daninho ou concorrente em lavouras de arroz cultivado permitem decidir o manejo na cultura e racionalizar o uso de herbicidas. O objetivo deste trabalho foi estimar NDE no arroz-vermelho e na cultivar de arroz EEA 406, usada como simuladora de arroz-vermelho, quando concorrem com arroz irrigado. Foram realizados três experimentos no campo, nas estações de crescimento 1999/2000 e 2000/2001. Avaliaram-se as populações dos genótipos competidores nos três experimentos e épocas relativas de emergência do arroz-vermelho (primeiro experimento), da cultivar simuladora (segundo experimento) e cultivares de arroz e espaçamentos entre linhas (terceiro experimento). Os NDE do arroz-vermelho foram inferiores aos da cultivar EEA 406. Os NDE estimados na cultivar EEA 406 variam amplamente, de acordo com as variáveis ambiente (ano), época de emergência, cultivar de arroz e espaçamento entre linhas da cultura. A emergência antecipada dos genótipos competidores em relação à cultura, o aumento do espaçamento entre linhas e a utilização de cultivares de ciclo curto diminuem os valores de níveis de dano econômico. Aumentos na produtividade de grãos, no preço de comercialização do arroz e na eficiência do controle e redução no custo do controle diminuem os NDE, tornando econômica a adoção de práticas de manejo sob menores populações dos genótipos competidores.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraAgostinetto, DirceuFleck, Nilson GilbertoRizzardi, Mauro AntonioJunior, Alvadi Antonio Balbinot2005-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/6913Pesquisa Agropecuaria Brasileira; v.40, n.1, jan. 2005; 1-9Pesquisa Agropecuária Brasileira; v.40, n.1, jan. 2005; 1-91678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/6913/3962info:eu-repo/semantics/openAccess2014-09-23T17:12:49Zoai:ojs.seer.sct.embrapa.br:article/6913Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-09-23T17:12:49Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice Dano econômico como critério na decisão sobre manejo de genótipos de arroz concorrentes em arroz irrigado |
title |
Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice |
spellingShingle |
Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice Agostinetto, Dirceu Oryza sativa; interference; economic analysis; mathematical models Oryza sativa; interferência; análise econômica; modelagem matemática |
title_short |
Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice |
title_full |
Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice |
title_fullStr |
Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice |
title_full_unstemmed |
Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice |
title_sort |
Economic threshold as a criterion for management decision of concurrent rice genotypes in flooded rice |
author |
Agostinetto, Dirceu |
author_facet |
Agostinetto, Dirceu Fleck, Nilson Gilberto Rizzardi, Mauro Antonio Junior, Alvadi Antonio Balbinot |
author_role |
author |
author2 |
Fleck, Nilson Gilberto Rizzardi, Mauro Antonio Junior, Alvadi Antonio Balbinot |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Agostinetto, Dirceu Fleck, Nilson Gilberto Rizzardi, Mauro Antonio Junior, Alvadi Antonio Balbinot |
dc.subject.por.fl_str_mv |
Oryza sativa; interference; economic analysis; mathematical models Oryza sativa; interferência; análise econômica; modelagem matemática |
topic |
Oryza sativa; interference; economic analysis; mathematical models Oryza sativa; interferência; análise econômica; modelagem matemática |
description |
The economic thresholds (ET) for weedy rice infestations in rice fields allow to decide the management of the rice crop, rationalizing herbicide use. The aim of this research was to estimate ET for red rice and for EEA 406 rice cultivar, mimicking red rice, when competing with flooded rice. Three field experiments were carried out, during the 1999/2000 and 2000/2001 growing seasons. The investigated factors were populations of the concurrents genotypes on the three experiments and red rice relative emergence times (first study), EEA 406 rice cultivar (second study) and rice cultivars and row widths (third experiment). ET values for red rice were lower than those for EEA 406 genotype. The ET values estimated for EEA 406 varied widely, according to environment (seasons), emergence time, rice cultivar and row width variables. Earlier emergence of concurrent genotypes in relation to the crop, increase in row width, and use of very early maturity cultivars decreased the ET values. Increases in grain yield, selling rice price and in control efficiency, and control cost reduction, decreased ET levels, making cost effective the adoption of management practices under lower concurrent genotype populations. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005-01-01 |
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/6913 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/6913 |
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/6913/3962 |
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.40, n.1, jan. 2005; 1-9 Pesquisa Agropecuária Brasileira; v.40, n.1, jan. 2005; 1-9 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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1793416652239405056 |