Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa)
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Semina. Ciências Agrárias (Online) |
Texto Completo: | https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/46184 |
Resumo: | : Leptochloa chinensis (L.) Nees (Chinese sprangletop) is a weed that is becoming a serious threat in upland and lowland rice. A field study was conducted at the Agronomic Research Farm, University of Sargodha, Punjab, Pakistan, during the summer seasons of 2018 and 2019 to evaluate the effect of L. chinensis density on the yield of direct-seeded fine rice. Treatments comprised of L. chinensis densities of 0, 5, 10, 15, 20 and 25 plants m-2, and the experiment was laid out in a randomized complete block design with four replications of each treatment. The results suggest that the presence of L. chinensis significantly hampered the grain yield of direct-seeded rice. Weed infestation caused 63% and 69% yield losses where 25 L. chinensis plants m-2 were sustained in 2018 and 2019, respectively. Yield reduction was due to the reduction in 1000-grain weight (22.9 and 29.1%), number of tillers m-2 (65.8 and 60.0%), and number of grains panicle-1 (53.3 and 60%) in 2018 and 2019, respectively. The highest weed infestation (25 plants m-2) produced the highest weed dry biomass (687 and 669 g m-2), N uptake (19.3 and 19.3 kg ha-1), P uptake (1.92 and 2.32 kg ha-1), and K uptake (20.53 and 20.27 kg ha-1) in 2018 and 2019, respectively. The lowest weed infestation (5 plants m-2) produced minimum weed dry biomass (47 and 85 g m-2), N uptake (1.6 and 2.9), P uptake (0.3 and 0.5), and K uptake (1.7 and 30 kg ha-1) in 2018 and 2019, respectively. The economic threshold of L. chinensis as estimated to cause 6.73% and 6.08% yield loss by the prediction model was 1.70 and 1.73 plants m-2 during 2018 and 2019, respectively. It can be concluded that L. chinensis is a serious weed in direct-seeded rice and it should be controlled when its density reaches 1.70-1.73 plants m-2 to avoid significant yield losses. |
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Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) Estimativa do limiar econômico de Leptochloa chinensis (chinese sprangletop) em arroz de grão fino (Oryza sativa) em semeadura diretaEconomic thresholdDensitiesMachine designweedCompetition.Limite econômicoDensidadesDesign IErvaCompetição.: Leptochloa chinensis (L.) Nees (Chinese sprangletop) is a weed that is becoming a serious threat in upland and lowland rice. A field study was conducted at the Agronomic Research Farm, University of Sargodha, Punjab, Pakistan, during the summer seasons of 2018 and 2019 to evaluate the effect of L. chinensis density on the yield of direct-seeded fine rice. Treatments comprised of L. chinensis densities of 0, 5, 10, 15, 20 and 25 plants m-2, and the experiment was laid out in a randomized complete block design with four replications of each treatment. The results suggest that the presence of L. chinensis significantly hampered the grain yield of direct-seeded rice. Weed infestation caused 63% and 69% yield losses where 25 L. chinensis plants m-2 were sustained in 2018 and 2019, respectively. Yield reduction was due to the reduction in 1000-grain weight (22.9 and 29.1%), number of tillers m-2 (65.8 and 60.0%), and number of grains panicle-1 (53.3 and 60%) in 2018 and 2019, respectively. The highest weed infestation (25 plants m-2) produced the highest weed dry biomass (687 and 669 g m-2), N uptake (19.3 and 19.3 kg ha-1), P uptake (1.92 and 2.32 kg ha-1), and K uptake (20.53 and 20.27 kg ha-1) in 2018 and 2019, respectively. The lowest weed infestation (5 plants m-2) produced minimum weed dry biomass (47 and 85 g m-2), N uptake (1.6 and 2.9), P uptake (0.3 and 0.5), and K uptake (1.7 and 30 kg ha-1) in 2018 and 2019, respectively. The economic threshold of L. chinensis as estimated to cause 6.73% and 6.08% yield loss by the prediction model was 1.70 and 1.73 plants m-2 during 2018 and 2019, respectively. It can be concluded that L. chinensis is a serious weed in direct-seeded rice and it should be controlled when its density reaches 1.70-1.73 plants m-2 to avoid significant yield losses.Leptochloa chinensis (L.) Nees (Chinese sprangletop) é uma planta daninha que está se tornando uma séria ameaça no arroz de terras altas e baixas. Um estudo de campo foi realizado na Fazenda de Pesquisa Agronômica, Universidade de Sargodha, Punjab, Paquistão, durante as estações de verão de 2018 e 2019 para avaliar o efeito da densidade de L. chinensis na produção de arroz fino de semeadura direta. Os tratamentos foram compostos por densidades de L. chinensis de 0, 5, 10, 15, 20 e 25 plantas m-2, e o experimento foi delineado em blocos casualizados com quatro repetições de cada tratamento. Os resultados sugerem que a presença de L. chinensis prejudicou significativamente a produtividade de grãos do arroz de semeadura direta. A infestação de ervas daninhas causou perdas de rendimento de 63% e 69%, onde 25 plantas de L. chinensis m-2 foram mantidas em 2018 e 2019, respectivamente. A redução da produtividade deveu-se à redução no peso de mil grãos (22,9 e 29,1%), número de perfilhos m-2 (65,8 e 60,0%) e número de panículas-1 (53,3 e 60%) em 2018 e 2019, respectivamente. A maior infestação de plantas daninhas (25 plantas m-2) produziu a maior biomassa seca de plantas daninhas (687 e 669 g m-2), absorção de N (19,3 e 19,3 kg ha-1), absorção de P (1,92 e 2,32 kg ha-1) , e absorção de K (20,53 e 20,27 kg ha-1) em 2018 e 2019, respectivamente. A menor infestação de plantas daninhas (5 plantas m-2) produziu biomassa seca mínima de plantas daninhas (47 e 85 g m-2), absorção de N (1,6 e 2,9), absorção de P (0,3 e 0,5) e absorção de K (1,7 e 30 kg ha-1) em 2018 e 2019, respectivamente. O limiar econômico de L. chinensis estimado para causar perda de rendimento de 6,73% e 6,08% pelo modelo de previsão foi de 1,70 e 1,73 plantas m-2 durante 2018 e 2019, respectivamente. Pode-se concluir que L. chinensis é uma planta daninha importante em arroz de semeadura direta e deve ser controlada quando sua densidade atingir 1,70-1,73 plantas m-2 para evitar perdas significativas de produtividade.UEL2023-06-22info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/4618410.5433/1679-0359.2023v44n2p803Semina: Ciências Agrárias; Vol. 44 No. 2 (2023); 803-822Semina: Ciências Agrárias; v. 44 n. 2 (2023); 803-8221679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/46184/48989Copyright (c) 2023 Semina: Ciências Agráriashttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessHayyat, Muhammad SikanderSafdar, Muhammad EhsanJavaid, Muhammad MansoorUllah, SamiChauhan, Bhagirath Singh2023-07-04T19:57:59Zoai:ojs.pkp.sfu.ca:article/46184Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2023-07-04T19:57:59Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false |
dc.title.none.fl_str_mv |
Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) Estimativa do limiar econômico de Leptochloa chinensis (chinese sprangletop) em arroz de grão fino (Oryza sativa) em semeadura direta |
title |
Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) |
spellingShingle |
Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) Hayyat, Muhammad Sikander Economic threshold Densities Machine design weed Competition. Limite econômico Densidades Design I Erva Competição. |
title_short |
Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) |
title_full |
Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) |
title_fullStr |
Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) |
title_full_unstemmed |
Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) |
title_sort |
Estimation of the economic threshold of Leptochloa chinensis (Chinese sprangletop) in direct-seeded fine grain rice (Oryza sativa) |
author |
Hayyat, Muhammad Sikander |
author_facet |
Hayyat, Muhammad Sikander Safdar, Muhammad Ehsan Javaid, Muhammad Mansoor Ullah, Sami Chauhan, Bhagirath Singh |
author_role |
author |
author2 |
Safdar, Muhammad Ehsan Javaid, Muhammad Mansoor Ullah, Sami Chauhan, Bhagirath Singh |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Hayyat, Muhammad Sikander Safdar, Muhammad Ehsan Javaid, Muhammad Mansoor Ullah, Sami Chauhan, Bhagirath Singh |
dc.subject.por.fl_str_mv |
Economic threshold Densities Machine design weed Competition. Limite econômico Densidades Design I Erva Competição. |
topic |
Economic threshold Densities Machine design weed Competition. Limite econômico Densidades Design I Erva Competição. |
description |
: Leptochloa chinensis (L.) Nees (Chinese sprangletop) is a weed that is becoming a serious threat in upland and lowland rice. A field study was conducted at the Agronomic Research Farm, University of Sargodha, Punjab, Pakistan, during the summer seasons of 2018 and 2019 to evaluate the effect of L. chinensis density on the yield of direct-seeded fine rice. Treatments comprised of L. chinensis densities of 0, 5, 10, 15, 20 and 25 plants m-2, and the experiment was laid out in a randomized complete block design with four replications of each treatment. The results suggest that the presence of L. chinensis significantly hampered the grain yield of direct-seeded rice. Weed infestation caused 63% and 69% yield losses where 25 L. chinensis plants m-2 were sustained in 2018 and 2019, respectively. Yield reduction was due to the reduction in 1000-grain weight (22.9 and 29.1%), number of tillers m-2 (65.8 and 60.0%), and number of grains panicle-1 (53.3 and 60%) in 2018 and 2019, respectively. The highest weed infestation (25 plants m-2) produced the highest weed dry biomass (687 and 669 g m-2), N uptake (19.3 and 19.3 kg ha-1), P uptake (1.92 and 2.32 kg ha-1), and K uptake (20.53 and 20.27 kg ha-1) in 2018 and 2019, respectively. The lowest weed infestation (5 plants m-2) produced minimum weed dry biomass (47 and 85 g m-2), N uptake (1.6 and 2.9), P uptake (0.3 and 0.5), and K uptake (1.7 and 30 kg ha-1) in 2018 and 2019, respectively. The economic threshold of L. chinensis as estimated to cause 6.73% and 6.08% yield loss by the prediction model was 1.70 and 1.73 plants m-2 during 2018 and 2019, respectively. It can be concluded that L. chinensis is a serious weed in direct-seeded rice and it should be controlled when its density reaches 1.70-1.73 plants m-2 to avoid significant yield losses. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-06-22 |
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://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/46184 10.5433/1679-0359.2023v44n2p803 |
url |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/46184 |
identifier_str_mv |
10.5433/1679-0359.2023v44n2p803 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/46184/48989 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2023 Semina: Ciências Agrárias http://creativecommons.org/licenses/by-nc/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2023 Semina: Ciências Agrárias http://creativecommons.org/licenses/by-nc/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
UEL |
publisher.none.fl_str_mv |
UEL |
dc.source.none.fl_str_mv |
Semina: Ciências Agrárias; Vol. 44 No. 2 (2023); 803-822 Semina: Ciências Agrárias; v. 44 n. 2 (2023); 803-822 1679-0359 1676-546X reponame:Semina. Ciências Agrárias (Online) instname:Universidade Estadual de Londrina (UEL) instacron:UEL |
instname_str |
Universidade Estadual de Londrina (UEL) |
instacron_str |
UEL |
institution |
UEL |
reponame_str |
Semina. Ciências Agrárias (Online) |
collection |
Semina. Ciências Agrárias (Online) |
repository.name.fl_str_mv |
Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL) |
repository.mail.fl_str_mv |
semina.agrarias@uel.br |
_version_ |
1799306086790987776 |