Abstract
Tectona grandis L.f. (teak), though considered a paragon among timber species, raises several questions on quality parameters when grown on farmlands. The growth characteristics and important wood quality parameters such as equilibrium moisture content, density, shrinkage, static bending strength and stiffness, compressive strength parallel and perpendicular to grain, hardness, nail and screw holding powers of 24–25-year-old teak from intensively managed block (Bim), partially managed line (Lpm) and unmanaged block (Bum) plantations grown under agroforestry practices (AFP) were studied. Overall growth rate of teak trees of Bim was greater than Lpm and Bum. Few wood quality parameters of Bum were comparatively better than Bim and Lpm. However, teak from three AFP exhibited lower wood quality parameters compared to average values of forest teak. Superiority of Bum is reflected mainly in density and bending strength compared to Bim and Lpm. Other properties like compressive strength, hardness and nail and screw holding powers were almost comparable among three AFP. Flexural strength, compression parallel to grain and hardness of Bim and Lpm were found to be comparable. Average wood properties of both managed plantations were lower than Bum. There was no significant effect observed in specific gravity of wood when age of trees increased from 12 to 24 years. Although, Bum exhibited better or comparable properties to Bim and Lpm, average growth was significantly lower than managed plantations. Selective harvesting of Bum at pole stage may support optimal resource utilization, reduce inter-tree competition and provide an option to further delay felling of unharvested residual trees. Delayed harvesting of teak may provide more optimal economic utilisation as strength parameters are predicted to improve with increased maturity. If a decision to enhance financial returns is warranted, commercial felling could be initiated for Bim among the three options, due to its higher growth rate and moderate wood properties which can translate into higher returns. The outcome of the present study may be useful to stakeholders for taking appropriate management decisions for optimal utilization of the farm grown teak bioresource.
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Acknowledgements
Authors are thankful to the Director, IWST for keen interest in the research work. We are also grateful to different members of project support group for the technical help in data collection.
Funding
This work was supported by the Karnataka Forest Department, Bengaluru under the research project titled “Comparative study on growth, wood quality and financial returns of teak managed under different agroforestry practices in Karnataka” (IWST/WPEW/KFD/100).
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Shukla, S.R., Viswanath, S. Comparison of growth and few wood quality parameters of 24–25-year-old Tectona grandis (teak) trees raised under three agroforestry practices. Agroforest Syst 97, 631–645 (2023). https://doi.org/10.1007/s10457-023-00815-5
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DOI: https://doi.org/10.1007/s10457-023-00815-5