Influence of a single foliar application of growth regulators on the height and number of inflorescence shoots of the chrysanthemum cultivar ‚Revert‘ was investigated during two growing seasons (2000, 2001). Two growth regulators were used, daminozide (Alar 85) and chlormequat (Cycocel). Daminozide was applied in concentrations of 1000, 2000 and 3000 mg l–1 and a control (without treatment) while chlormequat was used in concentrations of 2000, 3000, 4000 mg l–1 and a control (without treatment). The concentrations used differed significantly in their effects on plant height in both years whereas their effects on the number of inflorescence shoots were not significantly different. Daminozide concentration of 3000 mg l–1 was the most efficient concentration in the first year and that of 2000 mg l–1 in the second year. However, as no statistically significant differences between these two concentrations were recorded in either year, the use of the lower daminozide concentration in height regulation of ‘Revert’ chrysanthemum is recommended for environmental reasons. In the second trial year daminozide concentrations were more efficient in regulating the upward growth than chlormequat concentrations while this was not the case in the first year.

cut chrysanthemum; ‘Revert’; daminozide; chlormequat

Published by University of Zagreb, Faculty of Agriculture, Zagreb, CROATIA
Sponsored by Ministry Science and Education of the Republic of Croatia