Abstract

Crop regulation is a way to force a tree for its rest and to produce profuse blossom and fruits during flushes. It is as a mean of improving yield and fruit quality and maximize the production as well as profit to the grower. In this regard, an experiment was conducted during 2016-2017 at Mizoram University, Mizoram, India to assess the impact of crop regulation on growth, yield, and quality Grapes cv. Bangalore Blue. The experiment was laid out in randomised block design comprising of nineteen treatments viz Control (T1), Flower thinning (T2), Manual berry thinning (T3), Trunk girdling (T4), GA3 (T5), ethephon (T6), Flower thinning + GA3 (T7), Flower thinning + ethephon (T8), Flower thinning + GA3 + ethephon (T9), Manual berry thinning + GA3 (T10), Manual berry thinning + ethephon (T11), Manual berry thinning + GA3 + ethephon (T12), Trunk girdling + Flower thinning (T13), Trunk girdling + Manual berry thinning (T14), Trunk girdling + GA3 (T15), Trunk girdling + ethephon (T16), Trunk girdling + GA3 + ethephon (T17), Trunk girdling + Flower thinning + GA3 + ethephon (T18), and Trunk girdling + manual berry thinning + GA3 + ethephon (T19). The analysis of data indicated that crop regulation with Trunk girdling + manual berry thinning + GA3 + ethephon resulted in maximum shoot length (119.88 cm), shoot diameter (21.01 mm), internodal length (12.58 cm), cane diameter (6.71 mm), per cent fruitful cane (91.27%) and yield per vine (29.37 kg. Crop regulation with trunk girdling + flower thinning + GA3 + ethephon recorded the minimum crop duration (39.08 days) while, in terms of quality parameters, recorded the lowest moisture (79.16 %) and titratable acidity (0.608%) and highest raisin recovery (25.65%), juice (71.13%), TSS (20.50 and TSS: acid ratio (33.71). From the results of the present experiment, it can be concluded that crop regulation influenced markedly the growth, yield and quality of grapes.