Seca de ponteiros e crescimento de clones de eucalipto em diferentes doses de adubação

• Ano de defesa: 2011
• Autor(a) principal: Alves, Frederico de Freitas
• Orientador(a): Reis, Geraldo Gonçalves dos
• Banca de defesa: Leite, Hélio Garcia , Lima, Paulo César de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Ciência Florestal
• Departamento: Manejo Florestal; Meio Ambiente e Conservação da Natureza; Silvicultura; Tecnologia e Utilização de
• País: BR
• Palavras-chave em Português: Índice de área foliar; Fertilização de eucalipto; Clones de eucalipto
• Palavras-chave em Inglês: Leaf area index; Fertilization of eucalyptus; Eucalypt clones
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::SILVICULTURA
• Link de acesso: http://locus.ufv.br/handle/123456789/3089

The Cerrado biome has been widely used for the establishment of eucalypt plantations. This work aimed to evaluate the growth of eucalypt clones and susceptibility to die-back when subjected to different doses of fertilizer, in the cerrado region. The die-back was evaluated based on the proportion of plants and crown height with die-back at 13 months, leaf area index (LAI) at 13 and 21 months and volume at 11 and 19 months of age. The diameter and height were assessed up to 44 months to estimate the growth in volume per hectare. It was determined the dose of 10-28-06 NPK fertilizer to obtain the maximum production per clone. Clones 36, 02, 62, 10, and 280 presented high occurrence of die-back and very low production. The E2 clone showed reduced die-back, but its production was relatively low. It was observed low die-back in the control plants (phosphate application only).The die-back was negatively correlated to LAI, at 13 months. LAI, on the other hand, was positively correlated with the periodic monthly increment at 11 months. There was significant difference (p ≤ 0.05) in volume per hectare between the treatments that received doses of NPK 10-28-06 fertilizer and the control. The production was higher for the clones GG100, 3487 and 02, with optimal doses of fertilizer for maximum productivity of 110, 141 and 82 g plant-1, respectively. The application of fertilizer doses greater than that recommended by NUTRICALC did not result in increased production, producing a quadratic behavior with the application of increasing doses of fertilizer. Clone E1 presented the highest production up to 25 months of age and was little affected by the die-back, being recommended for short rotations. Clones GG100, 3487, 02, E2, I042, E5, E4 and 157 are recommended for longer rotations due to the increased production after the third year.