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Seed Dormancy:
                         Main problem has been potato where freshly harvested tubers fail to sprout before the termination of rest period.
Ø Chemical which have been reported to break the rest period  are GA, ethylene cholorhydrin and thiourea.
Ø The treatment which has been used for breaking of dormancy in potato comprise the vapour treatment with ethylene chlorhydrin ( 1 liter per 20 q) followed by dipping in thiourea (1% sol.) for 1h finally in GA (1 mg/l) for 2 seconds.
Ø Lettuce is another vegetable in which treatment with GA has been reported to break seed dormancy induced by high temperatures

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