Effect of Cycocel on decreasing of bolting in autumn planting of sugar beet in Karaj region

Stem going in sugar beet at first years is call bolting. Bolting is undesirable physiological phenomena that almost occurred in planting of winter sugar beet. Planting of winter sugar beet required to resistance cultivars to bolting for avoidance of flowering in spring harvest time. Aim of this experiment using of cycocel for avoidance of flowering in winter sugar beet. Experiment carry on in form of factorial in base of randomize complete block design with three replication in winter 2009. We have two cycocel factors comprise of foliar application in two levels 0 and 1000 ppm and foliar application time with seven levels comprise of control seed sprayed, 6th November, 6th December, 6th November & 6th December, seed sprayed &6th November & 6th December,6th February, 6th November & 6th December&6th February.Result showed that application of cycocel reduce bolting percentage and caused delay of flowering process but winter cold severe condition in Karaj have been effects dominant on cycocel treatments as at the end of sampling date was not significant different between cycocel and control treatments on bolting. Percent of bolt in control treatment and cycocel was 48.59%,43.38% respectively.The best time for spraying cycocel was 6th february with the lowest percent of bolt (39.2%).