Transpiration of young cocoa trees under soil water restriction

Detalhes bibliográficos
Autor(a) principal: Fraga Junior, Luciano Sobral
Data de Publicação: 2021
Outros Autores: Vellame, Lucas Melo, Oliveira, Aureo Silva de, Paz, Vital Pedro da Silva
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Scientia Agrícola (Online)
Texto Completo: https://www.revistas.usp.br/sa/article/view/183191
Resumo: Cocoa plantations in Brazil have been expanding beyond the borders of traditional regions by implementing a strategy based on irrigation and the establishment of crops exposed to full sunlight. The quantification of transpiration is essential to the establishment and management of crops, and is the main factor in the determination of water demand. This study had as its objective the estimating of transpiration of young cocoa trees as a function of reference evapotranspiration (ETo) and soil matric potential (Ψw). Two experiments were conducted, one in a greenhouse and the other in the field, using clones and seminal plants. Soil water content, plant transpiration and reference evapotranspiration were monitored. Cocoa trees were subjected to soil moisture reduction and their transpiration decreased linearly both in the field and in the greenhouse, due to decreases in the soil matric potential beyond a critical point. In the greenhouse average transpiration could be linearly estimated as a function of ETo when Ψw was higher than –24.89 kP. Drying soil conditions resulted in a reduction in transpiration by approximately a 2 % per unit decrease in Ψw. Under field conditions; clonal plant transpiration decreased linearly beyond the critical matric potential of –65.02 kPa, while in seminal plants this reduction occurred beyond –79.48 kPa. Clonal plants were more sensitive to soil water variations with average transpiration lower than that of seminal cocoa tree plants.
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spelling Transpiration of young cocoa trees under soil water restrictionTheobroma cacao L.sapflowevapotranspirationwater deficitCocoa plantations in Brazil have been expanding beyond the borders of traditional regions by implementing a strategy based on irrigation and the establishment of crops exposed to full sunlight. The quantification of transpiration is essential to the establishment and management of crops, and is the main factor in the determination of water demand. This study had as its objective the estimating of transpiration of young cocoa trees as a function of reference evapotranspiration (ETo) and soil matric potential (Ψw). Two experiments were conducted, one in a greenhouse and the other in the field, using clones and seminal plants. Soil water content, plant transpiration and reference evapotranspiration were monitored. Cocoa trees were subjected to soil moisture reduction and their transpiration decreased linearly both in the field and in the greenhouse, due to decreases in the soil matric potential beyond a critical point. In the greenhouse average transpiration could be linearly estimated as a function of ETo when Ψw was higher than –24.89 kP. Drying soil conditions resulted in a reduction in transpiration by approximately a 2 % per unit decrease in Ψw. Under field conditions; clonal plant transpiration decreased linearly beyond the critical matric potential of –65.02 kPa, while in seminal plants this reduction occurred beyond –79.48 kPa. Clonal plants were more sensitive to soil water variations with average transpiration lower than that of seminal cocoa tree plants.Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz2021-01-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/sa/article/view/18319110.1590/1678-992X-2019-0093Scientia Agricola; v. 78 n. 2 (2021); e20190093Scientia Agricola; Vol. 78 Núm. 2 (2021); e20190093Scientia Agricola; Vol. 78 No. 2 (2021); e201900931678-992X0103-9016reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USPenghttps://www.revistas.usp.br/sa/article/view/183191/169884Copyright (c) 2021 Scientia Agricolahttp://creativecommons.org/licenses/by-nc/4.0info:eu-repo/semantics/openAccessFraga Junior, Luciano Sobral Vellame, Lucas Melo Oliveira, Aureo Silva de Paz, Vital Pedro da Silva 2021-03-18T18:32:19Zoai:revistas.usp.br:article/183191Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2021-03-18T18:32:19Scientia Agrícola (Online) - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Transpiration of young cocoa trees under soil water restriction
title Transpiration of young cocoa trees under soil water restriction
spellingShingle Transpiration of young cocoa trees under soil water restriction
Fraga Junior, Luciano Sobral
Theobroma cacao L.
sapflow
evapotranspiration
water deficit
title_short Transpiration of young cocoa trees under soil water restriction
title_full Transpiration of young cocoa trees under soil water restriction
title_fullStr Transpiration of young cocoa trees under soil water restriction
title_full_unstemmed Transpiration of young cocoa trees under soil water restriction
title_sort Transpiration of young cocoa trees under soil water restriction
author Fraga Junior, Luciano Sobral
author_facet Fraga Junior, Luciano Sobral
Vellame, Lucas Melo
Oliveira, Aureo Silva de
Paz, Vital Pedro da Silva
author_role author
author2 Vellame, Lucas Melo
Oliveira, Aureo Silva de
Paz, Vital Pedro da Silva
author2_role author
author
author
dc.contributor.author.fl_str_mv Fraga Junior, Luciano Sobral
Vellame, Lucas Melo
Oliveira, Aureo Silva de
Paz, Vital Pedro da Silva
dc.subject.por.fl_str_mv Theobroma cacao L.
sapflow
evapotranspiration
water deficit
topic Theobroma cacao L.
sapflow
evapotranspiration
water deficit
description Cocoa plantations in Brazil have been expanding beyond the borders of traditional regions by implementing a strategy based on irrigation and the establishment of crops exposed to full sunlight. The quantification of transpiration is essential to the establishment and management of crops, and is the main factor in the determination of water demand. This study had as its objective the estimating of transpiration of young cocoa trees as a function of reference evapotranspiration (ETo) and soil matric potential (Ψw). Two experiments were conducted, one in a greenhouse and the other in the field, using clones and seminal plants. Soil water content, plant transpiration and reference evapotranspiration were monitored. Cocoa trees were subjected to soil moisture reduction and their transpiration decreased linearly both in the field and in the greenhouse, due to decreases in the soil matric potential beyond a critical point. In the greenhouse average transpiration could be linearly estimated as a function of ETo when Ψw was higher than –24.89 kP. Drying soil conditions resulted in a reduction in transpiration by approximately a 2 % per unit decrease in Ψw. Under field conditions; clonal plant transpiration decreased linearly beyond the critical matric potential of –65.02 kPa, while in seminal plants this reduction occurred beyond –79.48 kPa. Clonal plants were more sensitive to soil water variations with average transpiration lower than that of seminal cocoa tree plants.
publishDate 2021
dc.date.none.fl_str_mv 2021-01-06
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://www.revistas.usp.br/sa/article/view/183191
10.1590/1678-992X-2019-0093
url https://www.revistas.usp.br/sa/article/view/183191
identifier_str_mv 10.1590/1678-992X-2019-0093
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://www.revistas.usp.br/sa/article/view/183191/169884
dc.rights.driver.fl_str_mv Copyright (c) 2021 Scientia Agricola
http://creativecommons.org/licenses/by-nc/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2021 Scientia Agricola
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 Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
publisher.none.fl_str_mv Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
dc.source.none.fl_str_mv Scientia Agricola; v. 78 n. 2 (2021); e20190093
Scientia Agricola; Vol. 78 Núm. 2 (2021); e20190093
Scientia Agricola; Vol. 78 No. 2 (2021); e20190093
1678-992X
0103-9016
reponame:Scientia Agrícola (Online)
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Scientia Agrícola (Online)
collection Scientia Agrícola (Online)
repository.name.fl_str_mv Scientia Agrícola (Online) - Universidade de São Paulo (USP)
repository.mail.fl_str_mv scientia@usp.br||alleoni@usp.br
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