This research was conducted at the Faculty of Agricultural Engineering at Idlib University (northwestern Syria), during the academic year 2023-2024, to test the effect of treatment with the rooting hormone IBA (indole butyric acid) on the rooting rate and speed of some ornamental plants (Aglaonemamodestum, Euonymus japonica, and Jasminum humile), and determine the optimal concentration of IBA hormone for rooting cuttings of the ornamental plants. Three concentrations of the hormone were used, namely 250, 500, and 1000 ppm, in addition to the control (treatment with distilled and sterile water only).
The results showed that the tested plants varied in their response to treatment with the rooting hormone. All cuttings of the Aglaonema modestum plant were able to form roots even without treatment with the IBA hormone (control), and the rooting rate in all treatments was 100%. However, the use of the hormone led to a significant increase in the number of roots formed (10.2 roots) and their length (3.44 cm) and the length of the treated plants (11.70 cm), and increasing the hormone concentration did not achieve any significant increase in the studied traits.
In contrast, the cuttings of the Euonymus japonica plants did not root until after treatment with the hormone, and the treatment with the hormone (the lowest concentration of 250 ppm) achieved a significant increase in all studied traits, rooting percentage (90%), number of roots (7.3 roots), length (2.3 cm), and plant length (8.05 cm), compared to the control. Increasing the hormone concentration also achieved a significant increase in the number of roots formed on the cutting, a non-significant increase in the rooting percentage, and a non-significant decrease in root length and plant length.
Finally, 20% of the cuttings of the Jasminum humile plant were rooted without treatment with the rooting hormone, but the treatment with the hormone achieved a significant increase in the rooting percentage, number of roots (3.4 roots), length (1.82 cm), and plant length (6.40 cm), compared to the control. Increasing the concentration of rooting hormones also achieved a significant increase in the rooting percentage and the number of roots formed on the cutting, and a non-significant increase in the length of the roots and the length of the plants. The concentration of 1000 ppm achieved the best results (rooting percentage 60%, number of roots 7.1 roots/cutting, root length 4.04 cm, and plant length 10.64 cm).
Barakat, Hafsa & Draie, Rida. (2024). Effect of Indole Butyric Acid (IBA) Concentration on Rooting of Some Ornamental Plants. International Research Journal of Innovations in Engineering and Technology. 8. 173-180. DOI:10.47001/IRJIET/2024.811019.
Source: Research Gate