CALTA - Campus Universitário de Altamira
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/4384
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Navegando CALTA - Campus Universitário de Altamira por Autor "AUGUSTO, Sebastião Geraldo"
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Item Acesso aberto (Open Access) Genetic parameters and simultaneous selection for root yield, adaptability and stability of cassava genotypes(Empresa Brasileira de Pesquisa Agropecuária, 2013-12) FARIAS NETO, João Tomé de; CUNHA, Elisa Ferreira Moura; RESENDE, Marcos Deon Vilela de; CELESTINO FILHO, Pedro; AUGUSTO, Sebastião GeraldoThe objective of this work was to estimate genetic parameters and to evaluate simultaneous selection for root yield and for adaptability and stability of cassava genotypes. The effects of genotypes were assumed as fixed and random, and the mixed model methodology (REML/Blup) was used to estimate genetic parameters and the harmonic mean of the relative performance of genotypic values (HMRPGV), for simultaneous selection purposes. Ten genotypes were analyzed in a complete randomized block design, with four replicates. The experiment was carried out in the municipalities of Altamira, Santarém, and Santa Luzia do Pará in the state of Pará, Brazil, in the growing seasons of 2009/2010, 2010/2011, and 2011/2012. Roots were harvested 12 months after planting, in all tested locations. Root yield had low coefficients of genotypic variation (4.25%) and broad-sense heritability of individual plots (0.0424), which resulted in low genetic gain. Due to the low genotypic correlation (0.15), genotype classification as to root yield varied according to the environment. Genotypes CPATU 060, CPATU 229, and CPATU 404 stood out as to their yield, adaptability, and stability.Item Acesso aberto (Open Access) Período mínimo de colheita para avaliação de cultivares de cacau em Linhares - ES(2003-08) DIAS, Luiz Antônio dos Santos; SOUZA, Carlos Alberto Spaggiari; AUGUSTO, Sebastião Geraldo; MÜLLER, Manfred Willy; SIQUEIRA, Paulo RobertoThe minimum harvest period for evaluating cacao cultivars was investigated. 'Maranhão', 'Pará', 'Parazinho' (non-improved local cultivars) and ehte open-pollinated 'ICS 1' and the commercial hybrid mixture (improved cultivars) were evaluated in a 5 x 5 Latin square design containing 196-plant plots, during 10 years (1984-1993). The number of healthy fruits per plant (NHFP) and the wet seed weight per hectare (WSWH) and per fruit (WSWF) were the yield components evaluated. The combination of the first six and eight years of successive harvests for NHFP and WSWH, respectively, was shown to be necessary for cultivar evaluation, when correlation analyses between annual yields and accumulated yield in the decennium were performed. Extensive variability, superior performance in post-climax (1989-1993) and cultivar trends towards interaction with pre-climax age indicated that evaluation of Linhares cacao cultivars should be conducted only after the 8th year from planting.