Repeatability of agronomic characters in Brachiaria brizantha cultivars

Autor: 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
Přispěvatelé: 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.
Jazyk: angličtina
Rok vydání: 2013
Předmět:
Zdroj: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice)
Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
Popis: 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. Made available in DSpace on 2018-02-23T00:31:44Z (GMT). No. of bitstreams: 1 46RepeatabilityofagronomiccharactersinBrachiariabrizanthacultivars2013.pdf: 322049 bytes, checksum: 2a2969945ae1898faeae823b4f673faa (MD5) Previous issue date: 2018-02-22
Databáze: OpenAIRE
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