Crescimento e Produção de Eucalipto na Região do Médio Paraíba do Sul, RJ

Ataíde

et al. 2019

Pesq. agropec. bras.

The objective of this work was to evaluate the effect of forest rotation on the technical and economic feasibility of eucalyptus wood production for charcoal, in different productivity classes. Data came from Eucalyptus stands whose area was stratified into three classes of productivity: high, medium, and low. To each class, a different criterion of forest rotation was applied, as follows: age of maximum productivity, economic rotation age, single harvest age, and no technical parameter. Analyses of economic feasibility and production were performed for a 21-year planning horizon. For rotation without a technical parameter, a simulation by the Monte Carlo method was performed. For all rotation criteria, feasibility was observed for high- and medium-productivity classes, and unfeasibility for the low-productivity class. For rotation without a technical parameter, there is no chance for the project to be unfeasible. Wood production viability for charcoal under the studied conditions depends on the productivity class, for any rotation criterion adopted. Rotation criterion influences profitability, whose definition, according to productivity class, contributes to forest production maximization and to the economic return of the project, under the studied conditions.

Section: Resultsmentioning

confidence: 99%

Feasibility of wood production according to productivity class and rotation criteria

Ataíde

et al. 2019

Pesq. agropec. bras.

“…The Urograndis hybrid, in addition to better quality of wood, presents higher yields in volume and biomass and adaptability to several locations (FERREIRA et al, 2017). For Silva et al (2004), the adaptation of species to the effects of climate can help in the management of water under different humidity conditions, which is why water use reflects the complexity of factors involved in plant/environment interaction.…”

Section: Discussionmentioning

confidence: 99%

The Influence of Initial Irrigation on the Growth of Two Hybrids of Eucalyptus

Costa¹,

Lopes²,

Brito³

et al. 2018

In order to maximize the productivity of forest species, techniques such as irrigation have been used. The objective of this study was to evaluate the water use efficiency and the influence of the irrigation located in the growth of the hybrids of eucalyptus Grancam and Urograndis at 65 months. The study was carried out in the experimental area of the State University of Mato Grosso do Sul (UEMS), in Aquidauana (state of Mato Grosso do Sul, Brazil). The experimental design was randomized blocks with subdivided plots. The treatments used in the plots were two irrigation systems (microsprinkler and drip) and one control treatment with no irrigation (dryland), and in the subplots, the two hybrids of eucalyptus: Grancam (Eucalyptus grandis x Eucalyptus camaldulensis) and Urograndis (Eucalyptus urophylla x Eucalyptus grandis), submitted to irrigation up to the 53° month after planting (MAP). The results were submitted to the analysis of variance and the Tukey test for means comparisons at 5% of probability. The use of irrigation in eucalyptus influences the productivity, providing increased wood volume, height of plants and diameter at breast height (DBH). The hybrid Grancam showed greater increase in height, and Urograndis increased in DBH. The higher efficiency of water use for the volumetric production of wood was observed in drip irrigation for the hybrid Grancam. The hybrid Urograndis is more efficient in the use of water for the volumetric production of wood regardless of the treatment.

“…O crescimento volumétrico do híbrido E. urograndis e de E. grandis foi superior ao das demais espécies (Tabela 4). Esse desempenho era esperado, pois E. grandis caracteriza-se por apresentar alta produtividade, quando comparado à outras espécies do gênero (Barreiros et al, 2007;Souza & Fiorentin, 2013;Ferreira et al, 2017).…”

Section: Discussionunclassified

Desempenho de espécies de Eucalyptus para uso em sistemas de integração floresta-pecuária no bioma Pampa

Ribaski

2018

Pesq. flor. bras.

Objetivou-se avaliar o desempenho de Eucalyptus grandis, E. dunnii, E. benthamii, E. badjensis e do híbrido E. urograndis, em relação à sobrevivência e produtividade florestal em uma área experimental implantada no município de Alegrete, RS. Os sistemas de integração Floresta-Pecuária foram compostos por linhas triplas de árvores, plantadas no espaçamento 3 m x 2 m e distanciadas entre si em 30 m, resultando numa densidade inicial de 417 árvores ha-1, o que corresponde a 22,2% de área ocupada pelas faixas dos renques das árvores, ficando o restante da área destinada à atividade pecuária (77,8%). As medições de diâmetro a 1,3 m acima do nível do solo (DAP) e das alturas das árvores foram feitas anualmente, até os sete anos de idade. O delineamento experimental foi inteiramente casualizado, com seis repetições por tratamento, e o software Assistat foi utilizado nas análises estatísticas. O desempenho de Eucalyptus grandis e E. urograndis tiveram destaque, em relação à sobrevivência, crescimento e produtividade, diferente de E. dunnii e E. benthamii que não apresentaram bom desempenho. E. badjensis não deve ser recomendado para plantios em condições ambientes análogas à dessa pesquisa.