Shortening dormancy of seed potatoes by a haulm application of gibberellic acid and storage temperature regimes

Abstract

In three experiments with cvs Diamant (short dormancy) and Desiree (long dormancy), the effect of a haulm application of gibberellic acid (GA) on the dormancy of seed potatoes harvested immature was investigated. Several storage temperature regimes were imposed to examine the interaction between GA and storage temperature. The storage regimes included 18 and 28 C continuously, hot pre-treatments of different duration (different periods at 28 C and subsequently 18 C) and a cold pre-treatment (20 days at 2 C and subsequently 18 C).