FRUIT QUALITY IMPROVEMENT IN 'THOMPSON SEEDLESS' GRAPES

S. Singh, S.S. Bindra, W.S. Dhillon, S.S. Sandhu
Studies on fruit quality improvement were conducted through the application of gibberellic acid (30,40 50,60 ppm) and mechanical berry thinning (25, 50, 75, 80, 90 per cent removal) seven days after fruit-set on vines treated with 2.0 per cent Dormex solution for early ripening. Treatment of 30 ppm GA3 was found to be the most effective in increasing the bunch weight (394 g) and berry weight (1.46 g) over all other treatments. The unsprayed and unthinned vines had minimum bunch and berry weight of 319 g and 0.76 g respectively. Fruit quality in terms of total soluble solids and acidity was found better under 60 ppm GA3. From amongst the mechanical thinning treatments, 25 per cent berry removal produced the heaviest bunches (385 g) as compared to the control but the bunch weight decreased drastically with the increase of berry thinning. The berry weight, however, increased significantly with the successive increase of berry removal. Maximum berry weight (1.48 g) was recorded under 90 per cent berry thinning treatment. The total soluble solids showed a similar pattern as was the case of berry weight but the fruit acidity was found to be minimum under 50, 75 and 80 per cent berry thinning treatments. In nutshell GA3 @ 30 ppm and 25 per cent berry thinning were found to be the best treatments for improving the fruit quality of cv. Thompson Seedless.
Singh, S., Bindra, S.S., Dhillon, W.S. and Sandhu, S.S. (1992). FRUIT QUALITY IMPROVEMENT IN 'THOMPSON SEEDLESS' GRAPES. Acta Hortic. 321, 672-676
DOI: 10.17660/ActaHortic.1992.321.82
https://doi.org/10.17660/ActaHortic.1992.321.82

Acta Horticulturae