Effects of Ethephon Sprayed in Different Stages on the Florescence of Chrysanthemum

In the seedling stage, photoperiodic induction period, the green bud development stage and green bud stage of chrysanthemum, 2, 10, 20 and 50 mg/L ethephon(ETP) were sprayed to study the effects on the florescence of chrysanthemum. Results showed that the effects of ETP sprayed in different stage on the florescence of chrysanthemum were different, and the effects were strengthened along with the content of ETP increase. Sprayed in the seedling stage, photoperiodic induction period and the green bud stage development stage, ETP postponed the florescence of chrysanthemum. The effects of ETP sprayed in photoperiodic induction period were the strongest, especially the treatment of 50 mg/L postponed the florescence 19 d. Sprayed in green bud stage, ETP led to the florescence earlier than the control, the florenscence under 50 mg/L ETP treatment was 6 d earlier than the control.