The effects of hydrogen cyanamide (H2CN2) treatment on earliness and yield of plum and apricot varieties grown in greenhouse

This study was planned in attempt to define the effects of hydrogen cyanamide on earliness and yield in order to provide early bud break and depending upon to this to ensure early maturation by means of removing dormancy in plum and apricot varieties. In the treatment, 7 years old Papaz and Bekiroğlu plum varieties grafted on Pixy plum rootstock and Precoce de Tyrinthe and Ninfa apricot varieties were used as materials. The study was carried out on 120 trees, inside 200 m2 greenhouse with 60 trees set up with the distance as 2x1.5 m (333 trees/da) and on the mixed fruit orchard with 60 trees set up with the distance as 4x4 m (62 trees/da). The preparate, which is called Domino including with a dose of 2% and 4% hydrogen cyanamide ingredient in conjunction with control application, was applied on the 9th of January 2015 when the soil temperature reached 10oC. In the treatment, in order to define the effects of hydrogen cyanamid applications inside the greenhouse and in the open field, the phenological observations and pomological measurements were carried out and the data about parameters related to yield were obtained. According to the overall evaluation of the results, inside the greenhouse and in the open field, especially the bud break and blooming dates of plum and apricot varieties occured earlier with the hydrogen cyanamide application. However, within the scope of the treatment, there were not sufficient yield on plum varieties whether inside the greenhouse or in the open field. On apricot varieties, more yield was obtained with the trees applied 4% hydrogen cyanamid inside the greenhouse and with the trees of the control group in the open field.