Effect of Gibberellic Acid and Cycocel on Majorana hortensis Mnch1 I. The Plant Growth

Abstract

Two growth regulators GA and CCC were used in this experiment to study their effect on sweet marjoram plants. The concentrations used were 25,50, and 100 ppm for GA and 500. 1,000, 1,500, 2,000 and 4,000 for CCC. The study of the growth regulators comprised plant height, plant diameter, number of branches and the time of blooming.
The results of the study showed that the plant height was significantly increased due to GA treatments while it was significantly reduced due to CCC treatments in comparison with the control plants. Plant diameter showed a significant increase due to GA treatments and significant decrease due to CCC treatments. The number of branches was more in the GA treatments than the control and the CCC treatments. The time of blooming was not affected by the different treatments.