Faculdade de Engenharia Agronômica - FEA/CALTA
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/6601
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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.Item Acesso aberto (Open Access) Biomass yield and calorific value of six clonal stands of Eucalyptus urophylla S. T. Blake cultivated in Northeastern Brazil(Universidade Federal de Lavras, 2013-09) ANDRADE, Thiago Cavalcante Gomes Ribeiro de; BARROS, Nairam Félix de; DIAS, Luiz Eduardo; AZEVEDO, Maria Inês RamosThe worldwide demand for clean, sustainable energy has increased in recent years. A potential alternative energy source is biomass from nonnative forests, particularly from the genus Eucalyptus spp. in the specific case of Brazil, currently with several selected clonal stands for energy production. Because each stand adapts differently to different environments, specific studies are required in order to evaluate energy production in a given region. The objective of this study is to determine, from among six clonal stands of Eucalyptus urophylla S. T. Blake, which have greater potential for production of biomass and energy in the South Central region of Maranhão (Grajaú). Clonal stands planted at a spacing of 4 x 3 m apart were evaluated at age 41 months, distributed in a completely randomized design with five replicates. Each experimental plot consisted of 100 trees. Analysis included determining biomass yield and distribution in each tree portion as well as calorific value of bark and wood components. Out of the six clonal stands, two outdid the others both in biomass yield and in energy generation, surpassing the least yielding stand by up to 27%.