Desenvolvimento vegetativo e índices de clorofila de clones-copa de Bertholletia excelsa Bonpl., em Roraima

Abstract

The objective of this work was to determine the vegetative development and chlorophyll indices of six Amazon nut tree canopy clones, in different periods after grafting by bubbling in plaque, in Mucajaí -RR. The design used was randomized blocks, with four replications, with the treatments arranged in a split-plot scheme in time, with 6 canopy-clones in the plots and 4 evaluation periods (19; 25; 31 and 37 months after grafting) in the subplots. Plants were evaluated for halfyearly average increments in height and stem diameter. Chlorophyll indices and nitrogen content in the leaves were also obtained. The data were subjected to analysis of variance and the means of treatments compared by Tukey's test. Pearson's correlation between variables was also obtained. There were no significant differences in the development of canopy clones in any of the evaluated periods. The increments in height and diameter, as well as chlorophyll indices and nitrogen content in the leaves, were higher at 37 months after grafting, which coincides with one of the evaluated dry seasons. The positive correlation between growth variables and nitrogen content and chlorophyll indices explain the good development of the trees.