Relation between leaf area and dimensions of selected medicinal plants

https://doi.org/10.17221/4896-RAECitation:Çırak C., S Odabaş M., Sağlam B., K Ayan A. (2005): Relation between leaf area and dimensions of selected medicinal plants. Res. Agr. Eng., 51: 13-19.
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In this research, leaf area prediction models were developed for some leaf-used medicinal plants namely Calamintha nepeta, Datura stromonium, Melissa officinalis, Mentha piperita, Nerium oleander, Origanum onites and Urtica dioica growing wild in Black Sea region of Turkey. Lamina width, length and leaf area were measured non-destructively to develop the models. The actual leaf areas of the plants were measured by PLACOM Digital Planimeter, and multiple regression analysis with Excel 7.0 computer package program was performed for the plants separately. The produced leaf area prediction models in the present study were formulized as LA = (a) + (b1 × L) + [(b2 × (L × W)]  + (b3 × L2) + (b4 × W2) + [b5 × (L × W2)] + [b6 × (L2 × W)] + [b7 × (L2 × W2)] where LA is leaf area, W is leaf width, L is leaf length and a, b1, b2, b3, b4, b5, b6, and b7 are coefficients. R2 values for medicinal plants tested varied with species from 0.82 in Origanum onites to 0.98 in Urtica dioica. All R² values and standard errors were found to be significant at the P < 0.001 level.
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