Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon

Detalhes bibliográficos
Autor(a) principal: Cole, Jason
Data de Publicação: 2012
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/8598
Resumo: Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia
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spelling Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregonvitis viniferawater stressSouthern OregonMestrado Vinifera EuroMaster - Instituto Superior de AgronomiaA study was conducted to investigate the practical use of four methods for measuring plant water potential (!) of Vitis vinifera L. cv. Tempranillo (syn. Tinta Roriz, Aragónez) under field conditions within the Southern Oregon American Viticultural Area. Predawn leaf water potential (!pd), midday leaf water potential (!l-md), midday stem water potential (!s-md) and early morning stem water potential measured between 07:00h and 08:00h solar time (!s-em) were each measured on vines before and after the initiation of irrigation. Measurements were conducted on the same vines and on the same dates both before and after veraison. Irrigation was applied based on an estimation of vineyard evapotranspiration (ETc) and consisted of four treatments: 70% of ETc continuously (70-70), 35% of ETc continuously (35-35), 70% ETc before veraison and 35% ETc after veraison (70-35) and 35% before veraison and 75% ETc after veraison (35- 70). Irrigation was initiated based on !l-md. When assessing vineyard variability before the initiation of irrigation, with !pd ranging between -0.05 and -0.53, all four measurement types were able to distinguish between high vigor (HV) and low vigor (LV) zones and able to categorize vines under previously established thresholds. However, !l-md showed a tendency to underestimate vine water status at levels greater than -0.9 Mpa. When comparing !s-em, !s-md and !l-md, early morning measurements showed significant differences between irrigation treatments on 3 of 4 measurement dates while midday measurements were able to distinguish significant differences on only 1 of 4 dates. !s-em measurements were generally able to distinguish differences between vine water status even when morning cloud cover was present. Linear regression analysis of !pd versus !s-em, !s-md and !l-md at one site resulted in significant r2 values of 0.62, 0.69 and 0.58, respectively. Linear regression analysis of !s-md versus !l-md using data from both sites resulted in r2 values of 0.88. Overall, !s-em seemed to provide a better option for differentiating plant water status of Tempranillo grapevines in Southern Oregon compared to !s-md and !l-md within the range of water deficit levels studied here. !s-em was able to show differences between the water status of vines before the initiation of irrigation as well as differentiate between irrigation treatments later in the year. However, questions remain about the environmental and physiological factors that might impact the results of this method before water deficit threshold levels can be clearly definedISA/ULBalint, GabrielLopes, Carlos Manuel AntunesRepositório da Universidade de LisboaCole, Jason2015-12-31T01:30:11Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/8598engCole, J. - Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon. Lisboa: ISA, 2012, 54 p.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-12-24T01:32:23Zoai:www.repository.utl.pt:10400.5/8598Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:55:33.961778Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon
title Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon
spellingShingle Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon
Cole, Jason
vitis vinifera
water stress
Southern Oregon
title_short Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon
title_full Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon
title_fullStr Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon
title_full_unstemmed Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon
title_sort Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon
author Cole, Jason
author_facet Cole, Jason
author_role author
dc.contributor.none.fl_str_mv Balint, Gabriel
Lopes, Carlos Manuel Antunes
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Cole, Jason
dc.subject.por.fl_str_mv vitis vinifera
water stress
Southern Oregon
topic vitis vinifera
water stress
Southern Oregon
description Mestrado Vinifera EuroMaster - Instituto Superior de Agronomia
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-01-01T00:00:00Z
2015-12-31T01:30:11Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/8598
url http://hdl.handle.net/10400.5/8598
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Cole, J. - Use of water potential measurements for assessing water stress in Vitis vinifera L. cv. Tempranillo grown in Southern Oregon. Lisboa: ISA, 2012, 54 p.
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 ISA/UL
publisher.none.fl_str_mv ISA/UL
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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