Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal

Detalhes bibliográficos
Autor(a) principal: Gonçalves, Júlia Alves Roque
Data de Publicação: 2019
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/21289
Resumo: Mestrado em Engenharia Agronómica / Instituto Superior de Agronomia. Universidade de Lisboa
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spelling Yield gap explaining factors and solutions to improve yields in a maize farm in Portugalmaizeyield variabilitysowing datesreducing factorsyield gap analysisMestrado em Engenharia Agronómica / Instituto Superior de Agronomia. Universidade de LisboaOver the decades, it has been found that agricultural intensification, that is, the increase in production per hectare, is substantially urgent and necessary, justified by the observed and expected population increase and the impossibility of agricultural expansion. One of the methods for achieving this goal is the study and investigation of yield gaps, which may be explained by unfavorable soil and climate conditions, or less adequate input management. Given the socio-economic importance of maize crop in Portugal and the need for case studies that exemplify agricultural intensification methods, this dissertation aims to discover which are the reducing factors that justify the gap between the maximum and actual yields, known as yield gaps, which were analyzed between plots and years, and how large was the yield gap over the 10 years. Through a database of irrigation appropriations, nitrogen applications, sowing dates and climate data, collected over 10 years and provided by Milho Amarelo company, located in the Santarem region, other variables were calculated, such as degree-day accumulation, cultural evapotranspiration and intercepted radiation. These data were analyzed annually according to the whole cycle and according to different phenological phases (vegetative and reproductive). Once all variables were obtained and organized, statistical methods of bivariate and multivariate analysis were performed. The magnitude of yield gap was calculated according to the Approach 2 indicated by FAO 41. The results show that interaction of sowing dates with climatic conditions are in the nature of this deviation, with gap’s magnitude ranging from 5% to 20%, depending on the climatic conditions of the yearISAVan Evert, FritsCoelho, José Paulo Pimentel de CastroRepositório da Universidade de LisboaGonçalves, Júlia Alves Roque2021-05-14T09:16:32Z20192019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/21289engGonçalves, J.A.R. - Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal. Lisboa: ISA, 2019, 55 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:RCAAP2023-03-06T14:50:43Zoai:www.repository.utl.pt:10400.5/21289Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:05:54.192081Repositório 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 Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal
title Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal
spellingShingle Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal
Gonçalves, Júlia Alves Roque
maize
yield variability
sowing dates
reducing factors
yield gap analysis
title_short Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal
title_full Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal
title_fullStr Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal
title_full_unstemmed Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal
title_sort Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal
author Gonçalves, Júlia Alves Roque
author_facet Gonçalves, Júlia Alves Roque
author_role author
dc.contributor.none.fl_str_mv Van Evert, Frits
Coelho, José Paulo Pimentel de Castro
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Gonçalves, Júlia Alves Roque
dc.subject.por.fl_str_mv maize
yield variability
sowing dates
reducing factors
yield gap analysis
topic maize
yield variability
sowing dates
reducing factors
yield gap analysis
description Mestrado em Engenharia Agronómica / Instituto Superior de Agronomia. Universidade de Lisboa
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-01-01T00:00:00Z
2021-05-14T09:16:32Z
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/10400.5/21289
url http://hdl.handle.net/10400.5/21289
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Gonçalves, J.A.R. - Yield gap explaining factors and solutions to improve yields in a maize farm in Portugal. Lisboa: ISA, 2019, 55 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
publisher.none.fl_str_mv ISA
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_ 1799131151300820992

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