Physiological responses of watercress to brackish waters and different nutrient solution circulation times

Detalhes bibliográficos
Autor(a) principal: Souza, Camila Alves de
Data de Publicação: 2020
Outros Autores: Silva, Alexsandro Oliveira da, Lacerda, Claudivan Feitosa de, Silva, Ênio Farias de França e, Bezerra, Marlos Alves
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/38562
Resumo: Water scarcity and the use of brackish water are the main challenges for agricultural development. In view of this, the present study proposes to examine physiological responses of the broadleaf-cress crop in an NFT hydroponics system according to the use of brackish water and nutrient solution circulation times. The treatments were distributed in a randomized block design with five water salinity levels (ECw: 0.6, 1.6, 2.6, 3.6 and 4.6 dS m-1) and two nutrient solution circulation times (T1 = 10 min and T2 = 15 min), totaling 10 treatments with four replicates, which resulted in 40 experimental plots. The following variables were analyzed: net photosynthetic rate, stomatal conductance, transpiration, leaf proline content, shoot moisture content, stem diameter and root length. The maximum observed photosynthetic rates were 20.9 mmol m-2 s-1 (T1) and 20.0 mmol m-2 s-1 (T2). Maximum stomatal conductance was 0.44 mol m-2 s-1, which decreased by 63.4% at the highest salinity level. The increasing ECw levels in both growing cycles evaluated reduced gas exchanges, stem diameter and root length. The nutrient solution circulation time of 15 min provided the most satisfactory results for the analyzed variables.
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spelling Physiological responses of watercress to brackish waters and different nutrient solution circulation timesRespostas fisiológicas de agrião com águas salobras e diferentes tempos de circulação da solução nutritivaNasturtium officinalisGas exchangeElectrical conductivityHydroponics.Nasturtium officinalisTrocas gasosasCondutividade elétricaHidroponia.Water scarcity and the use of brackish water are the main challenges for agricultural development. In view of this, the present study proposes to examine physiological responses of the broadleaf-cress crop in an NFT hydroponics system according to the use of brackish water and nutrient solution circulation times. The treatments were distributed in a randomized block design with five water salinity levels (ECw: 0.6, 1.6, 2.6, 3.6 and 4.6 dS m-1) and two nutrient solution circulation times (T1 = 10 min and T2 = 15 min), totaling 10 treatments with four replicates, which resulted in 40 experimental plots. The following variables were analyzed: net photosynthetic rate, stomatal conductance, transpiration, leaf proline content, shoot moisture content, stem diameter and root length. The maximum observed photosynthetic rates were 20.9 mmol m-2 s-1 (T1) and 20.0 mmol m-2 s-1 (T2). Maximum stomatal conductance was 0.44 mol m-2 s-1, which decreased by 63.4% at the highest salinity level. The increasing ECw levels in both growing cycles evaluated reduced gas exchanges, stem diameter and root length. The nutrient solution circulation time of 15 min provided the most satisfactory results for the analyzed variables.A escassez hídrica e o uso de água salobras são os principais desafios para o desenvolvimento agrícola. Diante disto o objetivo deste trabalho foi avaliar respostas fisiológicas da cultura do agrião d’ água de folhas larga em sistema hidropônico NFT em função do uso de águas salobras e tempos de circulação da solução nutritiva. Os tratamentos foram distribuídos em delineamento em blocos casualizados, com cinco níveis de salinidade da água (CEa: 0,6; 1,6; 2,6; 3,6 e 4,6 dS m-1) e dois tempos de circulação da solução nutritiva, (T1 =10 e T2=15 min), totalizando 10 tratamentos com 4 repetições, resultando em 40 parcelas experimentais. As variáveis analisadas foram: taxa de fotossíntese líquida, condutância estomática, transpiração, teor foliar de prolina, teor de umidade da parte aérea das plantas, diâmetro do caule e comprimento das raízes. A máxima fotossíntese observada foi de 20,9 mmol m-2 s-1 (T1) e 20,0 mmol m-2 s-1 (T2), para a condutância estomática foi 0,44 mol m-2s-1 provocando decréscimo 63,4%. O aumento dos níveis de CEa, em ambos os ciclos de cultivo avaliados, reduziram os valores de trocas gasosas, diâmetro do caule e comprimento da raiz. O tempo de 15 min promoveu os resultados mais satisfatórios para as variáveis analisadas.UEL2020-09-19info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/3856210.5433/1679-0359.2020v41n6p2555Semina: Ciências Agrárias; Vol. 41 No. 6 (2020); 2555-2570Semina: Ciências Agrárias; v. 41 n. 6 (2020); 2555-25701679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELenghttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/38562/28058Copyright (c) 2020 Semina: Ciências Agráriashttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessSouza, Camila Alves deSilva, Alexsandro Oliveira daLacerda, Claudivan Feitosa deSilva, Ênio Farias de França eBezerra, Marlos Alves2022-10-06T16:52:25Zoai:ojs.pkp.sfu.ca:article/38562Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2022-10-06T16:52:25Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false
dc.title.none.fl_str_mv Physiological responses of watercress to brackish waters and different nutrient solution circulation times
Respostas fisiológicas de agrião com águas salobras e diferentes tempos de circulação da solução nutritiva
title Physiological responses of watercress to brackish waters and different nutrient solution circulation times
spellingShingle Physiological responses of watercress to brackish waters and different nutrient solution circulation times
Souza, Camila Alves de
Nasturtium officinalis
Gas exchange
Electrical conductivity
Hydroponics.
Nasturtium officinalis
Trocas gasosas
Condutividade elétrica
Hidroponia.
title_short Physiological responses of watercress to brackish waters and different nutrient solution circulation times
title_full Physiological responses of watercress to brackish waters and different nutrient solution circulation times
title_fullStr Physiological responses of watercress to brackish waters and different nutrient solution circulation times
title_full_unstemmed Physiological responses of watercress to brackish waters and different nutrient solution circulation times
title_sort Physiological responses of watercress to brackish waters and different nutrient solution circulation times
author Souza, Camila Alves de
author_facet Souza, Camila Alves de
Silva, Alexsandro Oliveira da
Lacerda, Claudivan Feitosa de
Silva, Ênio Farias de França e
Bezerra, Marlos Alves
author_role author
author2 Silva, Alexsandro Oliveira da
Lacerda, Claudivan Feitosa de
Silva, Ênio Farias de França e
Bezerra, Marlos Alves
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Souza, Camila Alves de
Silva, Alexsandro Oliveira da
Lacerda, Claudivan Feitosa de
Silva, Ênio Farias de França e
Bezerra, Marlos Alves
dc.subject.por.fl_str_mv Nasturtium officinalis
Gas exchange
Electrical conductivity
Hydroponics.
Nasturtium officinalis
Trocas gasosas
Condutividade elétrica
Hidroponia.
topic Nasturtium officinalis
Gas exchange
Electrical conductivity
Hydroponics.
Nasturtium officinalis
Trocas gasosas
Condutividade elétrica
Hidroponia.
description Water scarcity and the use of brackish water are the main challenges for agricultural development. In view of this, the present study proposes to examine physiological responses of the broadleaf-cress crop in an NFT hydroponics system according to the use of brackish water and nutrient solution circulation times. The treatments were distributed in a randomized block design with five water salinity levels (ECw: 0.6, 1.6, 2.6, 3.6 and 4.6 dS m-1) and two nutrient solution circulation times (T1 = 10 min and T2 = 15 min), totaling 10 treatments with four replicates, which resulted in 40 experimental plots. The following variables were analyzed: net photosynthetic rate, stomatal conductance, transpiration, leaf proline content, shoot moisture content, stem diameter and root length. The maximum observed photosynthetic rates were 20.9 mmol m-2 s-1 (T1) and 20.0 mmol m-2 s-1 (T2). Maximum stomatal conductance was 0.44 mol m-2 s-1, which decreased by 63.4% at the highest salinity level. The increasing ECw levels in both growing cycles evaluated reduced gas exchanges, stem diameter and root length. The nutrient solution circulation time of 15 min provided the most satisfactory results for the analyzed variables.
publishDate 2020
dc.date.none.fl_str_mv 2020-09-19
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/38562
10.5433/1679-0359.2020v41n6p2555
url https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/38562
identifier_str_mv 10.5433/1679-0359.2020v41n6p2555
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/38562/28058
dc.rights.driver.fl_str_mv Copyright (c) 2020 Semina: Ciências Agrárias
http://creativecommons.org/licenses/by-nc/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2020 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. 41 No. 6 (2020); 2555-2570
Semina: Ciências Agrárias; v. 41 n. 6 (2020); 2555-2570
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_ 1799306082639675392

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