Wood quality variation in Tectona grandis (teak) clones from CSO raised at Maredumilli (Rajahmundry), Andhra Pradesh

Abstract

Core samples collected from 30–31 year old Tectona grandis (teak) clones from CSO raised in 1974 at Maredumilli, Rajahmundry, Andhra Pradesh were evaluated for different wood quality parameters. Based on mean annual increment (MAI) computed from tree growth and volume of wood, the trees were categorized in three groups—best (B), average (A) and poor (P) performing clones. Variation in fibre length, fibre diameter, wall thickness; increment growth rate, moisture content and specific gravity were studied using core samples taken from two opposite sides at breast height of stem of each clone. Comparisons were made between these categories based on the wood quality parameters. The objective of study was to generate base line information on wood quality of teak clones which are source material for plantations and further research programs. This will also help the tree breeders and forest managers in selecting best quality planting stock based on the inherent wood quality traits for further propagation. The results of the study indicated that different wood quality parameters such as anatomical structure, growth rates, percentage of moisture content and specific gravity varied within as well as between the categories and exhibited to have greater relevance as reference information for quality improvement and value addition than MAI alone. Some of clones having average MAI exhibited comparatively better wood quality parameters. Similarly, some of best clones showed slightly inferior values to certain wood quality parameters. It is thus suggested that in any large scale species improvement programs taken up by the plantation industries including Forest Departments, more emphasis should be given to wood quality parameters during progeny trials of such commercially important species for different end use applications as value addition.