Investigation of Salicylic acid effect in different growth stages on quality and quantity of Grape varieties rish baba in Shahrood

Salicylic acid is one of growth regulator that has important role in regulation physiologic process in plants. Current investigation for studying effect of salicylic acid spraying on qualitative and quantitative characteristics in Rishbaba grape at grape orchard in 2013- 2014, performing in randomized complete block design with 4 repelication. The treatment in experiment was 150 mg/lit concentration of salicylic acid in 4 growth stages includes: vegetative growth, 50% of flowering, complete sour grapes, and three weeks before harvest. The results shows that applying salicylic acid increased cluster number in tree, cluster length, berries number in cluster, length and width of berries, average weight in 100 berries, juice volume, total sugar in fruit, titratable acidity and single seed weight in Rishbaba cultivar than control. Percentage of total soluble solids did not increase than control. In general, results of this research show that 150 mg/lit concentration of salicylic acid spraying has positive effect on improved growth stages and grape production.