RESULTS OF ASSESSING GROWTH AND STEM QUALITY OF SOME Acacia hybrid VARIETIES IN DONG NAI PROVINCE

Abstract

The extreme impacts of climate change are becoming more severe, and the invasion of fungal diseases has reduced the productivity, quality and economic efficiency of Acacia hybrid plantations in Dong Nai Province. The aim of this study is to select a Acacia hybrid variety with high yield and quality suitable for economic afforestation in Dong Nai Province. The experimental model includes 16 newly selected Acacia hybrid clonal planted in Xuan Loc, Dong Nai. Evaluation results after 42 months showed that there were significant differences among the clones in terms of survival rate, growth indicators, stem quality indicators, as well as infection rate and severity of wilt disease caused by Ceratocystis manginecans. The clones have good growth and stem quality. Out of a total of 16 Acacia hybrid clones tested, there are 3 clones KL-01-VC, KL-05-VC, KL-14-VC with productivity ranging from 28.3 - 31.3 m³/ha/year. These clones have straight trunks, small branches and disease infection rate of only 12.5 - 14.3%, which is in line with the objective of selecting high yielding and high quality Acacia hybrid for economic afforestation in Dongnai Province