Effect of Planting Dates And Different Concentrations of Iba on Rooting And Vegetative Growth of Hardwood Stem Cutting of Three Species of Mulberry (morus Spp.)

Abstract

This study was conducted during the growing season 2020 in the nursery of the Horticulture Department, College of Agricultural Engineering Sciences, University of Duhok, Kurdistan region, Iraq. Stem cuttings of three species of mulberry are taken from gardens of University of Duhok located at Malta. This study include three factors. First factor was the effect of three different planting dates (22nd January, 5th February and 19th February). The second factor was the effect of three species of mulberry (black mulberry (Morus nigra), white mulberry (Morus alba) and red mulberry (Morus rubra)). And the third factor was the effect of three concentrations of IBA (0, 1500 and 3000 mg.L-1). The results as the following; the first planting date on 22nd January gave the higher value of rooting percentage (61.19%). The cuttings of the black mulberry gave the higher rooting percentage (60.59%), and as IBA treatment had significant value of rooting percentage (45.70%) in (3000 mg. IBA L-1) treatment. There were significant effect caused in species of mulberry and in concentration of IBA on vegetative growth (length of stem, diameter of stem and number of leaves) were in the black mulberry and in (3000 mg. IBA L-1) treatment. While no significant effect of planting dates of three types of mulberry on the vegetative growth was recorded. The best result for rooting percentage (95.33%) was showed in triple interaction among (22nd January + (3000 mg.L-1) IBA + type of black mulberry).