Use of crop canopy cover to estimate lettuce Etc in a greenhouse
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , |
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. |
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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 |
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1799136543961513984 |