Alterações nas características químicas da madeira com a substituição do K por Na em plantações de eucalipto
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Data
2014
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Resumo
With the purpose of partial substitution of potassium by sodium in the forest plantations fertilization,
the effect of the isolated performance of these nutrients on the chemical properties of young wood in Eucalyptus
grandis trees was evaluated. Trees were planted at a 2mx3m spacing and 116 kg.ha -1 of K and 68.5 kg.ha -1 of
Na were applied to them. Eucalypt trees were cut down from the 1st to the 4th year after planting in each
fertilization treatment, being sectioned disks of wood in different positions of the trunk and marked the annual
growth rings, estimated by a stem profile model. Representative samples of each annual ring, longitudinal
position and treatment were obtained for determining the lignin, holocellulose and extractives. Eucalyptus
trees that received application of potassium and sodium did not change significantly in chemical properties,
indicating that the substitution of K by Na in fertilization of Eucalyptus plantations can be adopted without
the alteration of the chemical properties in the young wood in the young trees. Annual evaluations indicated
a significant reduction in average content of lignin and total extractives and an increase in average contents
of holocellulose with increasing age of the trees. Consistent changes in the levels of chemical properties of
wood for the longitudinal and ring growth were observed.
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Fertilização, Modelo de perfil do tronco, Qualidade da madeira, Fertilização, Qualidade da madeira, Modelo de perfil do tronco, Fertilization, Stem profile model, Wood quality
Citação
SETTE JR., Carlos Roberto; TOMAZELLO FILHO, Mario; SILVA JR., Francides Gomes da; LACLAU, Jean Paul. Alterações nas características químicas da madeira com a substituição do K por Na em plantações de eucalipto. Revista Árvore, Viçosa, v. 38, n. 3, p. 569-578, 2014.