Use of crop canopy cover to estimate lettuce Etc in a greenhouse

Detalhes bibliográficos
Autor(a) principal: Shahidian, Shakib
Data de Publicação: 2014
Outros Autores: Serrano, João, Vieira, Fabiana, Coelho, Renato
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/12613
Resumo: FAO PM Reference evapotranspiration, as described by Allen et al. (1998) is used extensively to calculate crop water needs, in the form of Crop evapotranspiration, ETc. The main challenge to its everyday use is the estimation of the correct crop coefficient (Kc). Although this can be done using crop growth stages, the farmer is left with a lot of guesswork. The objective of this work was to estimate the possibility of using canopy cover (Cc) measured by a standard camera to establish the Kc values of lettuce crop grown in a greenhouse. In a greenhouse in southern Europe, 0.3m diameter weighing mini-lysimeter were planted with lettuce. The Kc was calculated as a ratio of daily crop water use from the lysimeter and grass reference evapotranspiration (ETo). Canopy cover ratio (%Cc) was determined using the area of green in the lysimeter that was visible in the images. The results were plotted as a relation between Kc and Cc and an exponential approximation was made.The results were very positive showing a significant correlation between the calculated Kc and %Cc in the mini-lysimeters. The methodology proved to be highly effective in the early stages of the crop development, until the crop completely covers the soil. After that, the %Cc continued to increase until harvest, while the Kc indicator did not change.It can be concluded that this simple methodology can be used successfully to obtain good estimates of ETc, and thus optimize the water use in greenhouses.
id RCAP_93ac7eac1811178dfa647d586d14148f
oai_identifier_str oai:dspace.uevora.pt:10174/12613
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling Use of crop canopy cover to estimate lettuce Etc in a greenhouselettucegreenhouseevapotranspirationcrop coefficientFAO PM Reference evapotranspiration, as described by Allen et al. (1998) is used extensively to calculate crop water needs, in the form of Crop evapotranspiration, ETc. The main challenge to its everyday use is the estimation of the correct crop coefficient (Kc). Although this can be done using crop growth stages, the farmer is left with a lot of guesswork. The objective of this work was to estimate the possibility of using canopy cover (Cc) measured by a standard camera to establish the Kc values of lettuce crop grown in a greenhouse. In a greenhouse in southern Europe, 0.3m diameter weighing mini-lysimeter were planted with lettuce. The Kc was calculated as a ratio of daily crop water use from the lysimeter and grass reference evapotranspiration (ETo). Canopy cover ratio (%Cc) was determined using the area of green in the lysimeter that was visible in the images. The results were plotted as a relation between Kc and Cc and an exponential approximation was made.The results were very positive showing a significant correlation between the calculated Kc and %Cc in the mini-lysimeters. The methodology proved to be highly effective in the early stages of the crop development, until the crop completely covers the soil. After that, the %Cc continued to increase until harvest, while the Kc indicator did not change.It can be concluded that this simple methodology can be used successfully to obtain good estimates of ETc, and thus optimize the water use in greenhouses.Proceedings of the International Conference of Agricultural Engineering (AgEng2014)2015-02-18T15:49:20Z2015-02-182014-07-06T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/12613http://hdl.handle.net/10174/12613engShahidian, S., Serrano, J., Vieira, F., Coelho, R.(2014). Use of crop canopy cover to estimate lettuce Etc in a greenhouse. In: Proceedings of the International Conference of Agricultural Engineering (AgEng2014), Zurique, Suiça, 6-10 de julho, 6 p978-0-9930236-0-6http://www.geyseco.es/geystiona/adjs/comunicaciones/304/C05260001.pdfsimnaonaoERUshakib@uevora.ptjmrs@uevora.ptndrcoelho@uevora.pt214Shahidian, ShakibSerrano, JoãoVieira, FabianaCoelho, Renatoinfo: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:RCAAP2024-01-03T18:56:47Zoai:dspace.uevora.pt:10174/12613Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:05:53.437068Repositório 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 crop canopy cover to estimate lettuce Etc in a greenhouse
title Use of crop canopy cover to estimate lettuce Etc in a greenhouse
spellingShingle Use of crop canopy cover to estimate lettuce Etc in a greenhouse
Shahidian, Shakib
lettuce
greenhouse
evapotranspiration
crop coefficient
title_short Use of crop canopy cover to estimate lettuce Etc in a greenhouse
title_full Use of crop canopy cover to estimate lettuce Etc in a greenhouse
title_fullStr Use of crop canopy cover to estimate lettuce Etc in a greenhouse
title_full_unstemmed Use of crop canopy cover to estimate lettuce Etc in a greenhouse
title_sort Use of crop canopy cover to estimate lettuce Etc in a greenhouse
author Shahidian, Shakib
author_facet Shahidian, Shakib
Serrano, João
Vieira, Fabiana
Coelho, Renato
author_role author
author2 Serrano, João
Vieira, Fabiana
Coelho, Renato
author2_role author
author
author
dc.contributor.author.fl_str_mv Shahidian, Shakib
Serrano, João
Vieira, Fabiana
Coelho, Renato
dc.subject.por.fl_str_mv lettuce
greenhouse
evapotranspiration
crop coefficient
topic lettuce
greenhouse
evapotranspiration
crop coefficient
description FAO PM Reference evapotranspiration, as described by Allen et al. (1998) is used extensively to calculate crop water needs, in the form of Crop evapotranspiration, ETc. The main challenge to its everyday use is the estimation of the correct crop coefficient (Kc). Although this can be done using crop growth stages, the farmer is left with a lot of guesswork. The objective of this work was to estimate the possibility of using canopy cover (Cc) measured by a standard camera to establish the Kc values of lettuce crop grown in a greenhouse. In a greenhouse in southern Europe, 0.3m diameter weighing mini-lysimeter were planted with lettuce. The Kc was calculated as a ratio of daily crop water use from the lysimeter and grass reference evapotranspiration (ETo). Canopy cover ratio (%Cc) was determined using the area of green in the lysimeter that was visible in the images. The results were plotted as a relation between Kc and Cc and an exponential approximation was made.The results were very positive showing a significant correlation between the calculated Kc and %Cc in the mini-lysimeters. The methodology proved to be highly effective in the early stages of the crop development, until the crop completely covers the soil. After that, the %Cc continued to increase until harvest, while the Kc indicator did not change.It can be concluded that this simple methodology can be used successfully to obtain good estimates of ETc, and thus optimize the water use in greenhouses.
publishDate 2014
dc.date.none.fl_str_mv 2014-07-06T00:00:00Z
2015-02-18T15:49:20Z
2015-02-18
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/conferenceObject
format conferenceObject
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10174/12613
http://hdl.handle.net/10174/12613
url http://hdl.handle.net/10174/12613
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Shahidian, S., Serrano, J., Vieira, F., Coelho, R.(2014). Use of crop canopy cover to estimate lettuce Etc in a greenhouse. In: Proceedings of the International Conference of Agricultural Engineering (AgEng2014), Zurique, Suiça, 6-10 de julho, 6 p
978-0-9930236-0-6
http://www.geyseco.es/geystiona/adjs/comunicaciones/304/C05260001.pdf
sim
nao
nao
ERU
shakib@uevora.pt
jmrs@uevora.pt
nd
rcoelho@uevora.pt
214
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Proceedings of the International Conference of Agricultural Engineering (AgEng2014)
publisher.none.fl_str_mv Proceedings of the International Conference of Agricultural Engineering (AgEng2014)
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
repository.mail.fl_str_mv
_version_ 1799136543961513984