The effect of prune breeding and spraying active yeast suspension on the growth and production of flowers in two rose Rosa spp. cultivars

An experiment was conducted during the 2019-2020 growing season to study the effect of breeding pruning and spraying with active yeast suspension on the growth and production of cut flowers for two cultivars of roses. Legend cultivar was significantly excelled to the Damascene cultivar in leaf area, total chlorophyll content of leaves and number of days to flowering (575.46cm².plant^-1, 76.70mg.100 gm^-1 fresh weight, and 49.7 days, respectively). In contrast, the Damascus cultivar excelled in the height of the plant and flower diameter (116.10 and 9.05cm, respectively). Pruning on two flowering branches led to a significant increase in the average plant height trait, leaf content of nutrients (N, P, and K). The flower stalk length and flower diameter were recorded 115.80cm, 3.38%, 0.459%, 3.47%, 57.90cm and 9.31cm, respectively. The spraying with active yeast suspension had the best significant values for the rates of all studied traits, represented by plant height, leaf area, and leaf content of chlorophyll and the content of the leaves of nutrients (N, P, K) and the number of days to flowering and the diameter of the flower.