STUDIES ON THE CHILLING REQUIREMENTS AND TOTAL GROWING DEGREE HOURS OF THE MAIN TURKISH HAZELNUT VARIETIES

A.B. Küden, C. Çakırmelikoglu, A. Kaya
Çakıldak, Uzunmusa, Sivri, Tombul, Palaz and Fosa hazelnut varieties were experimented to find out the chilling requirements and growing degree hours by Bidabe and chill unit methods. The total effective chilling temperatures to break dormancy of female flower buds of Çakıldak, Uzunmusa and Sivri varieties were determined to be 14 and the others were 15 units, considering the Bidabe method. Fosa gave the highest total warm temperature requirement (530–535 units).

The total chilling temperatures for breaking male flower buds were the least with 12 units for Çakıldak, Sivri and Uzunmusa and was the highest with 15 units for Fosa.

According to the Utah Model, Çakıldak, Uzunmusa, and Sivri female flower buds gave less chilling requirement (95 C.U.) to break dormancy, but higher total growing degree hours to reach full bloom than the others. The highest chilling requirement and the least total growing degree hours were obtained from Fosa variety with 160 C.U. and 1877 GDH, respectively.

The chilling requirements of the vegetative buds to break dormancy were higher than the others. Çakıldak gave the highest chilling requirement with 1064 chill units.

Küden, A.B., Çakırmelikoglu, C. and Kaya, A. (1997). STUDIES ON THE CHILLING REQUIREMENTS AND TOTAL GROWING DEGREE HOURS OF THE MAIN TURKISH HAZELNUT VARIETIES. Acta Hortic. 445, 185-190
DOI: 10.17660/ActaHortic.1997.445.25
https://doi.org/10.17660/ActaHortic.1997.445.25
Hazelnut, Corylus avellana L., Bidabe method, chill unit, total growing degree hours

Acta Horticulturae