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Fig. 7


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Simulated frost stress index as a function of both frost resistance (−13 °C, −18 °C and −23 °C) levels and acclimation rates (35, 42 and 49 days) for 2011–2012 and 2015–2016 winters. The computation is conducted for Dijon place. The winter Tmin and Tmax showed contrasted fluctuations during January and February 2012 with an intense cold period of three consecutive weeks (observed minimal Tmin of −15.7 °C the 5th of February) subsequent to a relative long warm period. Winter 2015–2016 experimented a minimal Tmin of −9 °C the 24th of November 2015 with less fluctuations than winter 2011–2012. Note that the date of sowing is fixed the 25th of October.

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