Improvement of Beauty Seedless Grape with Plant Regulators

Gibberellic acid (GA) and para-chlorophenoxy acetic acid (4-CPA) were sprayed on Beauty Seedless vines of 4 years of age. GA was applied at the concentrations of 50,100 and 150 ppm and 4-CPA at 5 and 10 ppm at full bloom and post bloom stage. There was a progressive increase in berry weight with the increase in concentrations from 50 to 150 ppm when GA was applied at full bloom stage. The maximum average berry weight (62.40 per cent) was recorded with GA (150 ppm) when applied at full bloom. 4-CPA (10 ppm) also increased the berry weight by 31.97 per cent when applied at full bloom. Maximum berry increase (37.4 per cent) in length was recorded with GA (150 ppm) at full bloom followed by its 100 ppm post bloom concentration. Maximum berry breadth increase (14.70 per cent) however, was recorded with GA (100 ppm) at full bloom. There was no effect on the acidity of the juice although total soluble solids were increased with the treatments.