Avalia??o do plantio homogêneo de mogno, Swietenia macrophylla King, em compara??o com o plantio consorciado com Eucalyptus urophylla S. T. Blake, após 40 meses de idade

摘要

In the Amazon, plantations of mahogany have been limited by attacks of Hypsiphylla grandella Zeller. On the other hand, urban plantings in Brasília have developed well. The objective of this work was to observe the development of mahogany in homogenous or in mixed stands with eucalypts planted in the água Limpa farm at the University of Brasilia - Federal District. The variables height, at 7, 12, 15, 24, 28, 36 and 40 months of age, and diameter, at 7, 24, 28, 36 and 40 months were measured. A split-plot entirely randomized design was used, the treatments being the plot and time the sub-plot. The average height of mahogan 40 months after planting in the mixed stands was of 2.28 m, whereas in homogenous stands it was 3.45 m and the maximum heights recorded were 4.15 m and 5.17 m respectively. The average diameter was also larger in the homogenous stand, with 6.92 cm compared to 4.08 cm for the mixed stands. Mortality was around 20% under both conditions. Attacks by H. grandella larvae was less in mixed stands, indicating that the eucalypts may function as a barrier, reducing the attack.