INFLUENCE OF CCC AND DARK PERIOD ON THE LENGTH OF THE STEM OF CHRYSANTHEMUM

This work describes the floral stem development of "Graceland" and "Yellow Graceland" Chrysanthemums, grown as potted plants, treated:

1. with CCC(2500 ppm) in one dose

2. with CCC(2500 ppm) in two doses with a 15-day interval

3. with an increase of dark period to 12,5 h by using black plastic.

The plants which were given a longer dark period showed an increase in the length of the stem in comparison with the untreated plants,and a decrease of length in those treated with CCC; one dose being more effective than two.

Neither a significant advance of the date of flowering nor a modification in the quality or quantity of the bloom was observed.

Symposium on Cultivation of Flowers under Protection in the Mediterranean Regions

J. Miranda de Larra

https://doi.org/10.17660/ActaHortic.1974.43.39