Yield loss and economic thresholds of yellow nutsedge in irrigated rice as a function of the onset of flood irrigation
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
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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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 |
_version_ |
1754193303861985280 |