The presented experiment on grape (Vitis vinifera L.), carried out in the growing season of 2022, transpired in the orchard of the Department of Horticulture and Garden Engineering, College of Agriculture, Tikrit University, Tikrit, Iraq. Two factors comprised the study. The first factor was two grape cultivars, i.e., Halwani and Kamali, while the second involved foliar application of sugar alcohol (mannitol) with three levels (0, 4, and 8 ml L-1). The study aimed to evaluate the grape cultivars, impact of sugar alcohol, and their interaction on the yield characteristics and qualitative traits. The vine plants planting had dimensions of 2 m × 4 m, with the experiment having the split-plot design. The trial included six treatments, randomly distributed into three replicates, with two vines per experimental unit, totaling 36 vine plants. The results showed adding sugar alcohol solution (8 ml L-1) led to a significant enhancement in the number of clusters, cluster weight, total suspended solids, total sugars, total acidity, and anthocyanin content. The grape cultivar Halwani outperformed the other cultivar Kamali for cluster weight, total yield, total sugars, and anthocyanin content, while cultivar Kamali excelled in the number of clusters and total acidity.
Grape (Vitis vinifera L.), grape cultivars, sugar alcohol, yield quantity, qualitative traits, sugars and anthocyanin content
Superiority of the sweet grape (Vitis vinifera L.) cultivar Halwani over the non-sweet cultivar Kamali was evident in cluster weight, total sugars, and anthocyanin content. Conversely, the non-sweet cultivar Kamali outperformed the sweet cultivar Halwani for cluster number and total acidity. However, both grape cultivars revealed nonsignificant differences in total suspended solids and yield quantity.