Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation

Detalhes bibliográficos
Autor(a) principal: Westendorff,Nixon da Rosa
Data de Publicação: 2014
Outros Autores: Agostinetto,Dirceu, Ulguim,André da Rosa, Perboni,Lais Tessari, Silva,Bruno Moncks da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Bragantia
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000100005
Resumo: Yellow nutsedge (Cyperus esculentus) is adapted to flooding and reduces yield in irrigated rice. Information on the competitive ability of this weed with the crop and the size of the economic damage caused is lacking. Mathematical models quantify the damage to crops and support control decision-making. This study aimed to determine yield losses and economic thresholds (ET) of this weed in the culture according to weed population and time of onset of irrigation of the crop. The field study was conducted in the agricultural year of 2010/2011 in Pelotas/RS to evaluate the competitive ability of BRS Querência in competition with different population levels of yellow nutsedge and two periods of onset of flood irrigation (14 and 21 days after emergence). The hyperbolic model satisfactorily estimated yield losses caused by yellow nutsedge. Population of yellow nutsedge was the variable most fitted to the model. The delay of seven days for the beginning of rice irrigation causes decrease in competitive ability of BRS Querência, and based on the ET calculated to the price paid for rice, it is necessary between two and thirteen plants m-2 weed to justify the control in the first and second period of irrigation, respectively. Increases in yield, price paid for rice and control efficiency of the herbicide, besides reduction of costs of controlling promote reduction of ET of yellow nutsedge in rice crops, justifying the adoption of control measures even at smaller weed population.
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spelling Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigationCyperus esculentusOryza sativarectangular hyperboleYellow nutsedge (Cyperus esculentus) is adapted to flooding and reduces yield in irrigated rice. Information on the competitive ability of this weed with the crop and the size of the economic damage caused is lacking. Mathematical models quantify the damage to crops and support control decision-making. This study aimed to determine yield losses and economic thresholds (ET) of this weed in the culture according to weed population and time of onset of irrigation of the crop. The field study was conducted in the agricultural year of 2010/2011 in Pelotas/RS to evaluate the competitive ability of BRS Querência in competition with different population levels of yellow nutsedge and two periods of onset of flood irrigation (14 and 21 days after emergence). The hyperbolic model satisfactorily estimated yield losses caused by yellow nutsedge. Population of yellow nutsedge was the variable most fitted to the model. The delay of seven days for the beginning of rice irrigation causes decrease in competitive ability of BRS Querência, and based on the ET calculated to the price paid for rice, it is necessary between two and thirteen plants m-2 weed to justify the control in the first and second period of irrigation, respectively. Increases in yield, price paid for rice and control efficiency of the herbicide, besides reduction of costs of controlling promote reduction of ET of yellow nutsedge in rice crops, justifying the adoption of control measures even at smaller weed population.Instituto Agronômico de Campinas2014-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000100005Bragantia v.73 n.1 2014reponame:Bragantiainstname:Instituto Agronômico de Campinas (IAC)instacron:IAC10.1590/brag.2014.001info:eu-repo/semantics/openAccessWestendorff,Nixon da RosaAgostinetto,DirceuUlguim,André da RosaPerboni,Lais TessariSilva,Bruno Moncks daeng2014-04-28T00:00:00Zoai:scielo:S0006-87052014000100005Revistahttps://www.scielo.br/j/brag/https://old.scielo.br/oai/scielo-oai.phpbragantia@iac.sp.gov.br||bragantia@iac.sp.gov.br1678-44990006-8705opendoar:2014-04-28T00:00Bragantia - Instituto Agronômico de Campinas (IAC)false
dc.title.none.fl_str_mv Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
title Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
spellingShingle Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
Westendorff,Nixon da Rosa
Cyperus esculentus
Oryza sativa
rectangular hyperbole
title_short Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
title_full Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
title_fullStr Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
title_full_unstemmed Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
title_sort Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
author Westendorff,Nixon da Rosa
author_facet Westendorff,Nixon da Rosa
Agostinetto,Dirceu
Ulguim,André da Rosa
Perboni,Lais Tessari
Silva,Bruno Moncks da
author_role author
author2 Agostinetto,Dirceu
Ulguim,André da Rosa
Perboni,Lais Tessari
Silva,Bruno Moncks da
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Westendorff,Nixon da Rosa
Agostinetto,Dirceu
Ulguim,André da Rosa
Perboni,Lais Tessari
Silva,Bruno Moncks da
dc.subject.por.fl_str_mv Cyperus esculentus
Oryza sativa
rectangular hyperbole
topic Cyperus esculentus
Oryza sativa
rectangular hyperbole
description Yellow nutsedge (Cyperus esculentus) is adapted to flooding and reduces yield in irrigated rice. Information on the competitive ability of this weed with the crop and the size of the economic damage caused is lacking. Mathematical models quantify the damage to crops and support control decision-making. This study aimed to determine yield losses and economic thresholds (ET) of this weed in the culture according to weed population and time of onset of irrigation of the crop. The field study was conducted in the agricultural year of 2010/2011 in Pelotas/RS to evaluate the competitive ability of BRS Querência in competition with different population levels of yellow nutsedge and two periods of onset of flood irrigation (14 and 21 days after emergence). The hyperbolic model satisfactorily estimated yield losses caused by yellow nutsedge. Population of yellow nutsedge was the variable most fitted to the model. The delay of seven days for the beginning of rice irrigation causes decrease in competitive ability of BRS Querência, and based on the ET calculated to the price paid for rice, it is necessary between two and thirteen plants m-2 weed to justify the control in the first and second period of irrigation, respectively. Increases in yield, price paid for rice and control efficiency of the herbicide, besides reduction of costs of controlling promote reduction of ET of yellow nutsedge in rice crops, justifying the adoption of control measures even at smaller weed population.
publishDate 2014
dc.date.none.fl_str_mv 2014-03-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000100005
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000100005
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/brag.2014.001
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Instituto Agronômico de Campinas
publisher.none.fl_str_mv Instituto Agronômico de Campinas
dc.source.none.fl_str_mv Bragantia v.73 n.1 2014
reponame:Bragantia
instname:Instituto Agronômico de Campinas (IAC)
instacron:IAC
instname_str Instituto Agronômico de Campinas (IAC)
instacron_str IAC
institution IAC
reponame_str Bragantia
collection Bragantia
repository.name.fl_str_mv Bragantia - Instituto Agronômico de Campinas (IAC)
repository.mail.fl_str_mv bragantia@iac.sp.gov.br||bragantia@iac.sp.gov.br
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