O objetivo desse trabalho foi selecionar as melhores progênies e indivíduos de um teste de progênies de irmãos completos de eucalipto com base no tamanho efetivo populacional, endogamia e ganho genético. O delineamento experimental foi de blocos incompletos, contendo 18 progênies, 75 repetições com uma planta por parcela. No mesmo experimento, 388 clones comerciais de E. urophylla × E. grandis foram utilizados como controle. Aos 6 anos de idade, os caracteres avaliados foram diâmetro à altura do peito, altura total, volume, incremento médio anual (IMA) e sobrevivência. As análises foram realizadas com base no procedimento genético-estatístico de modelos mistos via REML/BLUP. Para otimização de seleção foi feita simulação de 30 diferentes cenários, com diferentes tamanhos efetivos populacionais, taxas de endogamia e ganhos acumulados das populações selecionadas corrigidos pela endogamia. As herdabilidades individuais e de média de progênies apresentaram valores de alta magnitude (h 2 a > 0.50 e h 2 mp > 0.80), indicando alto controle genético para os caracteres avaliados. O coeficiente de determinação dos efeitos da parcela (² c parc) apresentou valores baixos para todos os caracteres e a acurácia foi acima de 90%, o que demonstra baixa influência ambiental. A progênie que apresentou o maior valor genético predito foi um híbrido triplo (E. dunni × E. grandis) × E. urophylla que apresentou segregação com indivíduos transgressivos potenciais para clonagem ou cruzamentos direcionados. O cenário simulado mais indicado para seleção alcançou um ganho genético de 114,53% para a variável IMA, com uma taxa de endogamia de 3,92%. Tais resultados possibilitarão a redução do cruzamento de indivíduos aparentados, maximização dos ganhos genéticos e a transformação do experimento em pomares de sementes por mudas.

Wood is the most expensive fraction in the pulp production costs. Therefore, strategies for increasing wood quality such as faster growth, higher wood basic density and lower lignin content are drivers to pulp mills. The cultivation site as well as the eucalypt clones influence the wood quality, which, in turn, affects the pulp production performance. Thus, this work aims to evaluate the effect of the site on the wood quality for the pulp production. Three eucalypt clones from five different sites in Brazil were used in this study. These samples were selected aiming to represent a gradient of environmental stress. It was possible to observe a reduction in the content of extractives and lignin and an increase in the content of glucans in the sites with less environmental stress, reflecting in the production of pulp with less effective alkali demanded (reduction of 13.5 %) and an increase of 10.5 % in the kraft pulp screened yield. MAIP values of 22.7 ton/ha/year were obtained in the sites with less environmental stress, presenting a lower specific wood consumption. Through the production indicators, it was observed that the C1 clone is more adaptable to the regions of greater environmental stress than the other clones analyzed.

The search for novel biomasses for uses as alternative fiber sources, similar to Eucalyptus spp. biomass, holds great value and potential for commercial-scale application. This study aims to present the hybrid clones of Corymbia spp. developed by Aperam BioEnergia as potential substitutes for Eucalyptus wood in the market pulp industry. By performing modified kraft pulping and chemical characterization analyses, it was possible to compare the biomass of Eucalyptus spp. with that of Corymbia spp. Comparisons were made by analyzing their respective pulp average growth rate (PAGR) and specific wood consumption (SWC), estimated using a kappa number of 19 ± 1. The results showed that one of the hybrid clones (Corymbia citriodora × Corymbia torelliana - ID 4) had highest PAGR#k19, and lowest SWC than other samples. Clone ID 4 showed lowest value of SWC since, simultaneously presented a higher value of wood basic density and screened yield. Consequently, in agreement with its best results, clone ID 4 had the highest-ranking score, calculated as the PAGR/SWC ratio. This genetic material also showed one of the lowest total lignin content, consequently the highest screening yield. Besides Clone ID 4 showed significantly highest xylan content, among wood samples assessed in this work. For that reason, the ID 4 was the highest-ranked, proving to be an excellent high-performance alternative for forest-industry interface parameters.