Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis

Detalhes bibliográficos
Autor(a) principal: Oliveira, Izabela Regina C. de
Data de Publicação: 2013
Outros Autores: Rezende, Marcelo T., Dias, Carlos Tadeu dos S., Gomes, Daniela de S., Botrel, Élberis P., Gomes, Luiz Antônio A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/28658
Resumo: In many agricultural experiments the variables are biologically correlated and it is inappropriate to study them only under univariate analysis. Therefore, we evaluated commercial characteristics of crisphead lettuce cultivars and covers under a multivariate approach, using canonical discriminant analysis. We used a split plot design and we tested the cover crop, cultivar and interaction effects by using MANOVA (α= 5%). Means and its standard errors were obtained for average total weight, weight of the head, volume and density of plants. Canonical discriminant analyses were performed using PROC CANDISC procedure in SAS (SAS Institute, 2008) system. Canonical plots were obtained using JMP 9.0 (SAS Institute, 2010) linked to SAS database. With these plots it was possible to note the differences among factors levels. When polyethylene film was used as cover the plants had inferior commercial characteristics than plants in which cover crops were used. Thus, the cover with polyethylene film can be discouraged in the cultivation of crisphead lettuce, promoting environmental sustainability. We suggest these multivariate techniques in horticulture studies.
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spelling Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysisAvaliação de cultivares de alface americana em diferentes coberturas por manova e análise discriminanteAlface - Características comerciaisCobertura vegetalAnálise discriminante canônicaLettuce - Commercial featuresCover cropDiscriminant canonical analysisIn many agricultural experiments the variables are biologically correlated and it is inappropriate to study them only under univariate analysis. Therefore, we evaluated commercial characteristics of crisphead lettuce cultivars and covers under a multivariate approach, using canonical discriminant analysis. We used a split plot design and we tested the cover crop, cultivar and interaction effects by using MANOVA (α= 5%). Means and its standard errors were obtained for average total weight, weight of the head, volume and density of plants. Canonical discriminant analyses were performed using PROC CANDISC procedure in SAS (SAS Institute, 2008) system. Canonical plots were obtained using JMP 9.0 (SAS Institute, 2010) linked to SAS database. With these plots it was possible to note the differences among factors levels. When polyethylene film was used as cover the plants had inferior commercial characteristics than plants in which cover crops were used. Thus, the cover with polyethylene film can be discouraged in the cultivation of crisphead lettuce, promoting environmental sustainability. We suggest these multivariate techniques in horticulture studies.Em muitos experimentos agrícolas as variáveis respostas são biologicamente correlacionadas e torna-se inadequado analisá-las apenas sob a ótica univariada. Dessa forma, características comerciais de diferentes cultivares de alface americana e diferentes coberturas foram analisadas por uma abordagem multivariada, utilizando a técnica de análise discriminante canônica. O experimento foi realizado em esquema de parcelas subdividas e foram realizados testes de hipóteses para efeitos de cobertura, cultivar e interação entre os fatores, utilizando MANOVA (α= 5%). As médias e respectivos erros padrão foram obtidos para peso médio total, peso médio da cabeça, volume e densidade média das plantas. Análises discriminantes canônicas foram implementadas pelo comando PROC CANDISC do sistema computacional SAS 9.2 (SAS Institute, 2008) para os dois fatores. Figuras relacionando às duas primeiras variáveis canônicas foram obtidas usando o sistema computacional JMP 9.0 (SAS Institute, 2010) associado à base de dados do SAS. Esse procedimento possibilitou uma fácil visualização do comportamento dos fatores em estudo. O uso do plástico resultou em plantas com características comerciais inferiores se comparadas às resultantes de coberturas vegetais. Dessa forma, seu uso pode ser desencorajado no cultivo da alface do tipo americana, favorecendo a conservação ambiental. Recomenda-se o uso dessas técnicas multivariadas em estudos de olericultura.Associação Brasileira de Horticultura2018-02-23T12:32:37Z2018-02-23T12:32:37Z2013-07info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfOLIVEIRA, I. R. C. de et al. Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis. Horticultura Brasileira, Vitória da Conquista, v. 31, n. 3, p. 439-444, jul./set. 2013.http://repositorio.ufla.br/jspui/handle/1/28658Horticultura Brasileirareponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccessOliveira, Izabela Regina C. deRezende, Marcelo T.Dias, Carlos Tadeu dos S.Gomes, Daniela de S.Botrel, Élberis P.Gomes, Luiz Antônio A.eng2023-05-26T18:42:56Zoai:localhost:1/28658Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-05-26T18:42:56Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
Avaliação de cultivares de alface americana em diferentes coberturas por manova e análise discriminante
title Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
spellingShingle Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
Oliveira, Izabela Regina C. de
Alface - Características comerciais
Cobertura vegetal
Análise discriminante canônica
Lettuce - Commercial features
Cover crop
Discriminant canonical analysis
title_short Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
title_full Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
title_fullStr Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
title_full_unstemmed Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
title_sort Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis
author Oliveira, Izabela Regina C. de
author_facet Oliveira, Izabela Regina C. de
Rezende, Marcelo T.
Dias, Carlos Tadeu dos S.
Gomes, Daniela de S.
Botrel, Élberis P.
Gomes, Luiz Antônio A.
author_role author
author2 Rezende, Marcelo T.
Dias, Carlos Tadeu dos S.
Gomes, Daniela de S.
Botrel, Élberis P.
Gomes, Luiz Antônio A.
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Oliveira, Izabela Regina C. de
Rezende, Marcelo T.
Dias, Carlos Tadeu dos S.
Gomes, Daniela de S.
Botrel, Élberis P.
Gomes, Luiz Antônio A.
dc.subject.por.fl_str_mv Alface - Características comerciais
Cobertura vegetal
Análise discriminante canônica
Lettuce - Commercial features
Cover crop
Discriminant canonical analysis
topic Alface - Características comerciais
Cobertura vegetal
Análise discriminante canônica
Lettuce - Commercial features
Cover crop
Discriminant canonical analysis
description In many agricultural experiments the variables are biologically correlated and it is inappropriate to study them only under univariate analysis. Therefore, we evaluated commercial characteristics of crisphead lettuce cultivars and covers under a multivariate approach, using canonical discriminant analysis. We used a split plot design and we tested the cover crop, cultivar and interaction effects by using MANOVA (α= 5%). Means and its standard errors were obtained for average total weight, weight of the head, volume and density of plants. Canonical discriminant analyses were performed using PROC CANDISC procedure in SAS (SAS Institute, 2008) system. Canonical plots were obtained using JMP 9.0 (SAS Institute, 2010) linked to SAS database. With these plots it was possible to note the differences among factors levels. When polyethylene film was used as cover the plants had inferior commercial characteristics than plants in which cover crops were used. Thus, the cover with polyethylene film can be discouraged in the cultivation of crisphead lettuce, promoting environmental sustainability. We suggest these multivariate techniques in horticulture studies.
publishDate 2013
dc.date.none.fl_str_mv 2013-07
2018-02-23T12:32:37Z
2018-02-23T12:32:37Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv OLIVEIRA, I. R. C. de et al. Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis. Horticultura Brasileira, Vitória da Conquista, v. 31, n. 3, p. 439-444, jul./set. 2013.
http://repositorio.ufla.br/jspui/handle/1/28658
identifier_str_mv OLIVEIRA, I. R. C. de et al. Evaluation of crisphead lettuce cultivars in different cover types by manova and discriminant analysis. Horticultura Brasileira, Vitória da Conquista, v. 31, n. 3, p. 439-444, jul./set. 2013.
url http://repositorio.ufla.br/jspui/handle/1/28658
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv Attribution-NonCommercial 4.0 International
http://creativecommons.org/licenses/by-nc/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial 4.0 International
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 Associação Brasileira de Horticultura
publisher.none.fl_str_mv Associação Brasileira de Horticultura
dc.source.none.fl_str_mv Horticultura Brasileira
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
_version_ 1807835196417900544

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