International Journal of Agriculture Extension and Social Development

A stem cuttings of Thymus vulgaris, Thymus citriodorus and Thymus serpyllum were collected and treated with different concentrations of IBA (0, 250, 500, 750 and 1000 ppm) then they were planted under controlled conditions at the greenhouse. The root traits (rooting%, number of roots and length of roots), and shoot traits (length of main stem cm, number of shoots and length of shoots) were measured after two months of planting. The results were analyzed according to Randomized Completely Block Design with three replicates.

The treatments of IBA showed positive effect on all the studied trait as compared with the control, according to the concentration of IBA and the species studied. The concentration 500 ppm showed the best results over the studied species of thyme in terms of rooting percentage (83.67%), number of roots (141.86) and number of shoots (8.97), while the concentration of 250 ppm gave the highest root length (18.83 cm) and the main stem length (11.5 cm).

In general, these concentrations significantly surpassed the other concentrations. T. serpyllum showed the best root characteristics, while T. vulgaris had better shoot characteristics whereas T. citriodourus showed intermediate values between the two previous species.