Effects of Different Rootstocks and Treatment on Fruit Thinning in Golden Delicious Apple

This study was carried out in two location in 2013; an orchard in isparta-eğirdir fruit research institute and an orchard in the denizli-çıtak. golden delicious apple variety grafted on m9 rootstock in eğirdir location and golden delicious apple variety grafted on mm 106 rootstock in çıtak location were used. in the study, naa (6.25 %) was used as thinning plant growth regulator and (20, 30, 60 ml 100 l^-1 water) doses of naa was applied when fruits were in diameter of 7-8 mm. 750 ml 100 l^-1 water dose of 6 n-benzyladenine was applied when fruits had 10-12 mm diameter and after june drop thinning with hand was also done. study was planned to develop on alternative thinning method for hand thinning. especially 6.25% naa was used in different locations and different rootstocks for this purpose and naa effects on fruit quality were determined. according to study results highest thinning was determined from 20ml 100 l^-1 naa with 60.10% ratio on m9 rootstock in eğirdir location, highest thinning with hand was determined with a ratio of 78.71% on mm106 rootstock in çıtak location. 60 ml 100 l^-1 naa treatment had been evaluated for highest fruit size (fruit weight, width, height) on m9 rootstock in eğirdir location and 6 n-benzyladenine treatment was found for highest fruit size on mm106 rootstock in çıtak location. 20 ml 100 l^-1 naa (%6.25) treatment can be advised as an alternative for hand thinning for both locations and rootstocks