Repeatability of agronomic characters in Brachiaria brizantha cultivars.

Detalhes bibliográficos
Autor(a) principal: MARTUSCELLO, J. A.
Data de Publicação: 2013
Outros Autores: BRAZ, T. G. dos S., JANK, L., CUNHA, D. de N. F. V. da, SOUZA, M. W. M., BRITO, G. F. de, OLIVEIRA, L. P. de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1088045
Resumo: This experiment was carried out with the objectives of determining repeatability coefficients, the number of harvests necessary to increase accuracy and the genotypic stability of yield characteristics in Brachiaria brizantha cultivars in the northeast region of Brazil in the period from July 2009 to March 2011. The experimental design used was completely randomized with three treatments (Brachiaria brizantha var. Marandu, Xaraés and Piatã) and three replications. Each plot was harvested seven times: five in the rainy season and two in the dry season. Immediately after each harvest, the forage was weighed and dried to obtain total, stem, leaf and dead dry matter yields. For the estimation of the repeatability coefficient, analysis of variance, principal components (correlation and covariance matrices) and structural analyses were used. The repeatability coefficients (r) obtained by the different methods, for all characteristics evaluated, varied from 0.009 to 0.837. The estimates of the repeatability coefficients obtained for all characteristics evaluated by the method of analyses of variance were almost always lower than those obtained by the other methods. By the principal components method (based on the covariance matrix), the estimates were always higher than those from other methods. Considering that levels of 80 or 90% confidence are satisfactory in the evaluation of the relative superiority of the cultivars for all the evaluated characteristics, with the exception of dead matter yield, the seven harvests are sufficient for the choice of the best cultivar to be used in the northeast region of Brazil.
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spelling Repeatability of agronomic characters in Brachiaria brizantha cultivars.SelectionForage breedingCriação forrageiraProdução forrageiraSeleçãoForragemMateria secaForage productionThis experiment was carried out with the objectives of determining repeatability coefficients, the number of harvests necessary to increase accuracy and the genotypic stability of yield characteristics in Brachiaria brizantha cultivars in the northeast region of Brazil in the period from July 2009 to March 2011. The experimental design used was completely randomized with three treatments (Brachiaria brizantha var. Marandu, Xaraés and Piatã) and three replications. Each plot was harvested seven times: five in the rainy season and two in the dry season. Immediately after each harvest, the forage was weighed and dried to obtain total, stem, leaf and dead dry matter yields. For the estimation of the repeatability coefficient, analysis of variance, principal components (correlation and covariance matrices) and structural analyses were used. The repeatability coefficients (r) obtained by the different methods, for all characteristics evaluated, varied from 0.009 to 0.837. The estimates of the repeatability coefficients obtained for all characteristics evaluated by the method of analyses of variance were almost always lower than those obtained by the other methods. By the principal components method (based on the covariance matrix), the estimates were always higher than those from other methods. Considering that levels of 80 or 90% confidence are satisfactory in the evaluation of the relative superiority of the cultivars for all the evaluated characteristics, with the exception of dead matter yield, the seven harvests are sufficient for the choice of the best cultivar to be used in the northeast region of Brazil.Janaina Azevedo Martuscello, Universidade Federal de São João Del Rei; Thiago Gomes dos Santos Braz, Universidade Federal de Viçosa; LIANA JANK, CNPGC; Daniel de Noronha Figueiredo Vieira da Cunha, Universidade Federal de São João Del Rei; Madson Williame Melo Souza, Universidade Federal de Viçosa; Gerlane Ferreira de Brito, Universidade Federal de Alagoas; Leandro Pereira de Oliveira, Universidade Federal de Alagoas.MARTUSCELLO, J. A.BRAZ, T. G. dos S.JANK, L.CUNHA, D. de N. F. V. daSOUZA, M. W. M.BRITO, G. F. deOLIVEIRA, L. P. de2018-02-23T00:31:44Z2018-02-23T00:31:44Z2018-02-2220132018-02-23T00:31:44Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleRevista Brasileira de Zootecnia, v. 42, n. 1, p. 30-35, 2013http://www.alice.cnptia.embrapa.br/alice/handle/doc/1088045enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2018-02-23T00:31:51Zoai:www.alice.cnptia.embrapa.br:doc/1088045Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542018-02-23T00:31:51falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542018-02-23T00:31:51Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Repeatability of agronomic characters in Brachiaria brizantha cultivars.
title Repeatability of agronomic characters in Brachiaria brizantha cultivars.
spellingShingle Repeatability of agronomic characters in Brachiaria brizantha cultivars.
MARTUSCELLO, J. A.
Selection
Forage breeding
Criação forrageira
Produção forrageira
Seleção
Forragem
Materia seca
Forage production
title_short Repeatability of agronomic characters in Brachiaria brizantha cultivars.
title_full Repeatability of agronomic characters in Brachiaria brizantha cultivars.
title_fullStr Repeatability of agronomic characters in Brachiaria brizantha cultivars.
title_full_unstemmed Repeatability of agronomic characters in Brachiaria brizantha cultivars.
title_sort Repeatability of agronomic characters in Brachiaria brizantha cultivars.
author MARTUSCELLO, J. A.
author_facet MARTUSCELLO, J. A.
BRAZ, T. G. dos S.
JANK, L.
CUNHA, D. de N. F. V. da
SOUZA, M. W. M.
BRITO, G. F. de
OLIVEIRA, L. P. de
author_role author
author2 BRAZ, T. G. dos S.
JANK, L.
CUNHA, D. de N. F. V. da
SOUZA, M. W. M.
BRITO, G. F. de
OLIVEIRA, L. P. de
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Janaina Azevedo Martuscello, Universidade Federal de São João Del Rei; Thiago Gomes dos Santos Braz, Universidade Federal de Viçosa; LIANA JANK, CNPGC; Daniel de Noronha Figueiredo Vieira da Cunha, Universidade Federal de São João Del Rei; Madson Williame Melo Souza, Universidade Federal de Viçosa; Gerlane Ferreira de Brito, Universidade Federal de Alagoas; Leandro Pereira de Oliveira, Universidade Federal de Alagoas.
dc.contributor.author.fl_str_mv MARTUSCELLO, J. A.
BRAZ, T. G. dos S.
JANK, L.
CUNHA, D. de N. F. V. da
SOUZA, M. W. M.
BRITO, G. F. de
OLIVEIRA, L. P. de
dc.subject.por.fl_str_mv Selection
Forage breeding
Criação forrageira
Produção forrageira
Seleção
Forragem
Materia seca
Forage production
topic Selection
Forage breeding
Criação forrageira
Produção forrageira
Seleção
Forragem
Materia seca
Forage production
description This experiment was carried out with the objectives of determining repeatability coefficients, the number of harvests necessary to increase accuracy and the genotypic stability of yield characteristics in Brachiaria brizantha cultivars in the northeast region of Brazil in the period from July 2009 to March 2011. The experimental design used was completely randomized with three treatments (Brachiaria brizantha var. Marandu, Xaraés and Piatã) and three replications. Each plot was harvested seven times: five in the rainy season and two in the dry season. Immediately after each harvest, the forage was weighed and dried to obtain total, stem, leaf and dead dry matter yields. For the estimation of the repeatability coefficient, analysis of variance, principal components (correlation and covariance matrices) and structural analyses were used. The repeatability coefficients (r) obtained by the different methods, for all characteristics evaluated, varied from 0.009 to 0.837. The estimates of the repeatability coefficients obtained for all characteristics evaluated by the method of analyses of variance were almost always lower than those obtained by the other methods. By the principal components method (based on the covariance matrix), the estimates were always higher than those from other methods. Considering that levels of 80 or 90% confidence are satisfactory in the evaluation of the relative superiority of the cultivars for all the evaluated characteristics, with the exception of dead matter yield, the seven harvests are sufficient for the choice of the best cultivar to be used in the northeast region of Brazil.
publishDate 2013
dc.date.none.fl_str_mv 2013
2018-02-23T00:31:44Z
2018-02-23T00:31:44Z
2018-02-22
2018-02-23T00:31:44Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Revista Brasileira de Zootecnia, v. 42, n. 1, p. 30-35, 2013
http://www.alice.cnptia.embrapa.br/alice/handle/doc/1088045
identifier_str_mv Revista Brasileira de Zootecnia, v. 42, n. 1, p. 30-35, 2013
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/1088045
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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