ISHS Acta Horticulturae 785: International Symposium on Grape Production and Processing
INFLUENCE OF PRUNING TIMES AND VARIOUS CHEMICALS ON YIELD AND QUALITY OF THOMPSON SEEDLESS GRAPES |
| Authors: | N.M. Salunkhe, T.B. Tambe, J.H. Kadam |
| Abstract:
Grape (Vitis vinifera L.) is an important commercial fruit crop of Maharashtra having vast export potential. The pruning is an important practice to increase the yield and quality of the grapes. Hence, the experiment was carried out to study the effect of pruning and various chemicals on pigmentation of Thompson Seedless grapes at Ahmednagar (M.S.). The experiment was comprised of treatments having three dates of pruning, viz.: 16th September, 3rd and 22nd October and seven chemicals, viz.: control (recommended schedule of plant growth regulators), 6-BA at 10 ppm at 3 to 4 mm berry diameter stage, CPPU at 2 ppm at 3–4 mm berry diameter stage, ascorbic acid at 500 ppm at version stage, SDDTC at 100 ppm at 10 days before and after veraison stage and at veraison stage which was laid out in a factorial completely randomized design (FRBD). Altogether there were twenty one treatments replicated by four times and each treatment comprised of five vines. The results of time of pruning revealed that significantly maximum number of bunches per vine (34.05), maximum bunch weight (454.33 g), 100 berry weight (294.28 g), length of berry (19.80 mm), diameter of berry (16.50 mm), yield (34.01 MT/ha) and TSS (22.7°C) were observed in vines pruned on 22nd October with application of CPPU at 2 ppm at 3–4 mm berry diameter stage with recommended schedule of plant growth regulators. The highest total number of bunches affected due to pink berry per vine (20.16), percentage of infected berries per bunch (40.52%) and total anthocyanin content (0.317 mg/100 g), total sugars (21.58%) and reducing sugar (19.51%) were recorded in the vines pruned on 16th September, while lowest in the vines pruned on 22nd October. The study also showed the negative correlation of pigmentation with maximum and minimum temperature while positive correlation with morning as well as evening relative humidity. Overall, the pruning for fruiting should be done in third week of October with application of CPPU at 2 ppm at 3–4 mm berry diameter along with application of recommended plant growth regulators. | |
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