Determination Of Temperature Requirement In Some Commercial Apricot Cultivars In Tabriz

In this experiment the chilling and heating requirements of 5 commercial apricot (Prunus armenica L .) cultivars, Nasiri, Ordobad, Ghorban-e-Maragheh, Ghermez- e- Shahrood and Dorosht-e-Malayer were studied during years 1997-99 to assess their adaptability and time of blooming under different climatic conditions at Sahand Horticultural Research Station. Cut shoots of cultivars were prepared and kept in growth chamber in 15 days intervals, during the dormant period, from mid-summer up to late winter. The results indicated that the cultivars had different phases of dormancy during fall and winter, nevertheless they were blooming at the same time. The cultivar Ghorban-e-Maragheh with a short dormancy period had low chilling and high heating requirements. The cultivars Nasiri and Ordobad had deep and long true dormancy with high chilling requirements.