Investigations on the effects of applications ga3, cluster tipping and girdling on yield and quality in superior seedless (Vitis vinifera L.) grape variety

This study was carried out on own rooted 7 years old Superior Seedless (Vitis vinifera L.) table grape variety in a vegetation season of 2015 in Ahmetli district. The experiment was completely randomized block design with 7 treatment combinations replicated in four blocks. While all treatments was used at fruit set, GA3 as 10 ppm dosage used for elongate cluster (when cluster length reached 7-8 cm). In Control (C) only water was sprayed. The aim of this study was revealed effects of applications on grape yield and some quality characteristics of Cluster Tipping (CT), Girdling (G), CT+G, GA3+CT, GA3+G, GA3+G+CT, applications on grape yield and some quality characteristics. It was found that all applications generally had statistically (P<0.05) significant effects on grape yield, cluster weight, cluster width, berry length, berry width, berry length/berry width, soluble solid and titratable acidity in Superior Seedless. The highest grape yield, cluster weight, cluster length were obtained in GA3+G, the highest berry weight, the longest berry length were obtained in G, the highest soluble solid value were obtained in GA3 + CT+ G and GA3+G respectively. As results of this study, general recommendation is made of GA3+G the most suitable application for growing Superior Seedless table grape variety.