The requirement of refrigeration in some apricot varieties determination

In this study, chilling and heat requirements of Özal, İsmailağa, Şekerpare, Tokaloğlu (Erzincan), Çöloğlu and Early gold cv apricot grown in Research and experimental orchard of Malatya Apricot Research Institute were determined. The chilling requirements of cultivars were calculated according to 0-7.2 °C, Utah, Modified Utah, Positive Utah and ve dynamic model. The chilling requirements of Early Gold, which the lowest chilling requirement, were 927 ÜS according to 0-7.2 C, 754 MSB according to Modified Utah, 1084 PSB according to Positive Utah, 754 SB according to Utah and 42 ÜM according to dinamic model. Among the cultivars studied, Şekerpare, İsmailağa and Tokaloğlu were ones having the most chillng requrement. The chilling requirements of these cultivars were 1149 ÜS in 0-7.2 C, 1006 MSB in Modified Utah, 1344 PSB in Positive Utah, 1010 SB in Utah and 54 ÜM in dinamic model. Heat requirements of cultivars ranged from 4948 (Şekerpare) to 5671 (Early Gold) GDH. In addition, relationships among chilling requirement, heat requirement, flowering time, chilling period were determined.