GROWTH AND STEM QUALITY CHARACTER OF ACCIA HYBRID (ACACIA MANGIUM × ACACIA AURICULIFORMIS) CLONES IN EXTENDED TRIAL AT DINH QUAN, DONG NAI

Abstract

The objective of the research is to select acacia hybrid clones with fast growth and good stem quality character for afforestation in Dinh Quan, Dong Nai areas in particular and the Southeast region in general. The study was conducted in an extensive trial at Dinh Quan district, Dong Nai provine, including 7 acacia hybrid (BV586, BV376, BB055, BV584, BV523, BV434, BV350) that were recognized, 2 promising acacia hybrid varieties were BV355, BB028 and national variety AH1 as control. Evaluation results at 36 months of age showed that there were significant differences in growth indicators as well as stem quality characters, but there was no significant differences survival percentage between clones in the trial. Based on the results of growth assessment, survival rate and stem quality, four clones namely BV523, BB028, BV376 and BV434 were selected with the mean annual increment ranged from 20.97 to 22.75 m³/ha/year, high survival rate from 74.50 to 83.70 % and the overall quality index ranged from 4.16 to 4.44 points, which were as promising clones for Dinh Quan district, Dong Nai province and similar site conditions.