Influence of IBA Concentrations on the Success and Growth Characteristics of Grape Rooting Cuttings (Vitis vinifera L.)

Grape is one of the most important economical fruits in the world. The propagation of grapevines is an important consideration in commercial viticulture. This study was carried out on grapes cuttings, the grape variety named (Black magic) at Al-Jabal Al-akhdar region from El – Bayda city, Libya during 2022 and 2023. The study aimed at to determine the effect of various concentrations of Indole-3-butyric acid (IBA), and two different dates for collecting and preparing cuttings on the rooting ability and success of grape cuttings. Three different concentrations (control water, 1000 and 2000 ppm) were applied on to Black magic variety ( Vitis vinifera L.) in clay soil. After two months of planting the cuttings, the different rooting characteristics were measured such as number of roots per cutting, dry weight of the roots, and vegetative growth measurements such as percentage of successful cuttings, number of leaves per cutting, leaf area (cm 2 ) per cutting, and dry weight of the leaves per cutting. The results showed that the highest percentage of successful cuttings and number of the roots was achieved when using the synthetic hormone (IBA) at a concentration of 2000 ppm. These results were significantly and higher than those of the other treatments in terms of number of leaves, leaf area, and dry weight of the leaves for cuttings that were collected and planted in January.