Abstract

The experiment was conducted during 2017–18 in Kombetlar village of Kirkuk Province, Iraq. The aim of this study was to evaluate the effect of phosphorus and gibberellic acid on growth and yield of grape (Vitis vinifera L.). The first factor in this experiment was phosphorus in the form of P2O5 with three levels (0, 5 and 10 g/l) supplied through phosphatic fertilizer containing 46% phosphorus. The second factor was three levels (0, 100 and 200 ml/l) of gibberellic acid concentrations. The experiment was laid out in completely randomized block design with three replications and one grapevine was assumed as one plot. The results of this study showed significant effects of phosphorus and gibberellic acid on leaf area, chlorophyll content, carbohydrates, cluster number, cluster weight, fruit number, juice intensity, total soluble solids and total acidity of grape.