RESEARCH INFLUENCEABILITY OF FOREST COVER AND SUBSTRATUMS ON GROWTH AND DEVELOPMENT OFHOMALIUM HAINANENSE AT PERIOD OF NURSERY GARDEN IN QUANG BINH UNIVERSITY

Abstract

Homalium hainanenseis is not only a native species which is valuable for timber but used to for afforestation and reforestation. Currently, forestry programs and projects for afforestation and reforestation by native mixed-species plantings which are suitable with local site conditions are being implemented in QuangBinh Province. With study result obtained, the influence ability afforest cover and substratum on species growth at period of nursery garden were initially indentified. The study has shown that forest cover does not have influence on growth and development of Homalium hainanenseis at period of nursery garden while substratums do. The influence are as follow: superphosphate fertilizer at the rate of 3-4% give the highest growth and best original diameter; manure at the rate of 10% or 20% will have an impact on height, manure at the rate of 20% or 30% give the best original diameter of Homalium hainanenseis. This is a scientific foundation for proposing technique measures to Homalium hainanense seedling production models, serving afforestation and reforestation in Quang Binh province.