Abstract
Jerusalem artiohoke (Helianthus tuberosus L. cv. D-19) dormancy is normally broken by a 16-week treatment with 4 °C. A thermoperiod of 2 °C-12 h, 8 °C-12 h allows one to reduce this time to 12 weeks. Anoxy applied at 24 °C is effective after 4 weeks. By coupling anoxy and low températures varying daily between 2 °C - 12 h and 8 °C - 12 h, the breaking of dormancy is obtained after a one-week treatment.