Yield model and yield table construction in farm grown teak (Tectona grandis, Linn. F) under different agroclimatic zones of Tamil Nadu, India
2025
Krishnan, S N | Balasubramanian, A | Sivaprakash , M | Ravi , R | Sivakumar, B | Prasath , C N H | Swathiga, G | Manimaran , V | Anjali , K S
The market value of Tectona grandis has significantly increased due to the growing demand for its high quality wood. Known for its versatile applications, Tectona grandis is commonly cultivated in block and boundary formations across communal lands. A field study was conducted across four agro-climatic zones of Tamil Nadu, namely the North Eastern Zone (NEZ), North Western Zone (NWZ), Cauvery Delta Zone (CDZ) and Western Zone (WZ), covering three different age classes across 120 farm-grown plantations. Biometric parameters of the trees, including height and diameter at 2-m intervals, were recorded using a tree telescope. The collected data was processed and Multiple Linear Regression (MLR) analysis was applied to develop a yield model, enabling the construction of accurate yield tables for Tectona grandis without relying on a form factor. The following yield models were developed for the respective zones: NEZ as Y1= -0.291 + (0.002*Age) + (0.026**Mid diameter) + (0.010**Height), NWZ as Y2= -0.163 - (0.012** Age) + (0.028** Mid diameter) + (0.009** Height), CDZ as Y3= -0.343 - (0.001 Age) + (0.023** Mid diameter) + (0.024** Height) and WZ as Y4= -0.187 - (0.002 Age) + (0.051** Mid diameter) - (0.036** Height). The key finding of this study is that the growth of Tectona grandis varies significantly across different agro-climatic zones. This variation can be effectively monitored using statistically constructed yield tables, which provides a valuable tool for the sustainable management of Tectona grandis plantations.
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