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Optimal Germination Temperature Assessed by Indices and Models in Field Bean (Vicia faba L. var. minor)

Author(s): Khalil Khamassi | Kalthoum Harbaoui | Jaime A. Teixeira da Silva | Fayçal Ben Jeddi

Journal: Agriculturae Conspectus Scientificus (ACS)
ISSN 1331-7768

Volume: 78;
Issue: 2;
Start page: 131;
Date: 2013;
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Keywords: field bean | Vicia faba L. var minor | germination | temperature | root elongation | modeling

This paper seeks to shed light on the effect of temperature on field bean (Vicia faba L. var. minor) germination and root elongation. Accordingly, the results were as follows: germination was faster at 20°C than at 5, 10, 15, 25 or 30°C. However, temperature had no effect on total germination percentage between 10 and 30°C, although it was reduced by approximately 4% at 5°C and delayed at other temperatures. 50% germination required nine days at 5°C but only three days at 20°C. Seeds required a mean germination time of 12 days for total germination at 5°C but only four days at 20°C. The coefficient of the velocity or rate of germination index reached the highest (23.71%) and lowest (8.24%) value at 20°C and 5°C, respectively. Maximum germination speed (43.26), as assessed by the speed of germination index, was at 20°C. The speed of accumulated germination grew in proportion to the increase in incubation temperature. Th e main root axis length index and root elongation speed peaked at 20°C (five days and 0.72 cm/day, respectively). Prediction of optimal temperature for germination (To) by using the equation D = [a-(b×T) +(c×T2)] showed that 20°C is the optimum To, indicating that the theoretical model was robust. Hence, it could confidently be used to calculate all parameters related to the effect of temperature on faba bean germination.

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