Two field trials were carried out to study the effect of 16 treatments represented the combination
between four concentrations of kinetin (0.0, 25, 50 and 75 ppm.) and four levels of mineral fertilization (0.0, 2, 4 and 6 g/plant) on the growth, flowering, and chemical composition of Hemerocallus aurantiaca plant. Results showed that the three concentrations of kinetin increased vegetative growth parameters i.e., number of leaves/plant, fresh and dry weights of leaves/plant and number of offshoots/clumb for the flowering growth parameters i.e., number of days required from planting to start flowering, number of flower, flower stalk length, diameter, fresh and dry weights of flower stalk, duration of flower on plant and flower vase life positively were affected, as the same as chemical composition parameters i.e., leaf total carbohydrates , N, P and K contents with superior to the medium and high rates. Also, all levels of NPK fertilizer significantly improved all the abovementioned parameters, especially using the medium and high levels. Additionally, most of the combinations between kinetin concentrations and levels of NPK fertilizer improved all the studied parameters, particularly using the combinations between kinetin at 50 or75 ppm and NPK fertilizer at 4 or 6 g/L in both seasons. Conclusively, from the aforementioned results, it could be recommend that : to obtain the best vegetative and flowering characteristics with high quality of Hemerocallis aurantiaca; the plants should be sprayed with the treatment of kinetin at 75 ppm and combined with NPK at 6 g/plant that is being accompanied with vigorous vegetative and flowering growth and good quality as well.
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