Nut and kernel characteristics of hazelnut cultivars in an area outside the commercial production region in Turkey
Ankara province is located in Central Anatolia where a continental ecology dominates. Winters are cold, summers are hot and dry, humidity is low, and soil has high pH. In this study, performance of 46 hazelnut cultivars and selections were investigated in Ankara in 2015 and 2016. The continental ecology of Ankara had strong negative effects on nut and kernel traits. The average nut and kernel weights were 29.4 and 31.4% lower, respectively, for Turkish cultivars compared to the Black Sea region. Similarly, nut weights of Barcelona, Ennis, Halls Giant, Gem, Willamette, TGDL, Tonda di Giffoni, Mortarella, Casina and Segorbe were 37.0% lower on average. However, percent kernel was 6.2% higher in the Turkish cultivars, possibly due to better fill of the small nuts by the kernels. In Turkish cultivars grown near the Black Sea, the pellicle is easily removed from the kernels by dry heat (85-94% blanching), but in Ankara the range was 0.0-47%. Tombul and Foşa had a very low yield (<0.05 kg plant-1), but interestingly Willamette had the highest yield (3.12 kg plant-1) followed by Pauetet (1.92 kg), OSU 720.093 (1.74 kg) and Tonda di Giffoni (1.55 kg). These genotypes have short and open husks and could be grown in Ankara since their kernels may have value for processed hazelnut products or oil production but not for the blanched kernel market. The Spanish Negret was the most sensitive to this harsh ecology, as the trees did not survive although they were planted several times.
Erdogan, V. and Özdemir, B. (2018). Nut and kernel characteristics of hazelnut cultivars in an area outside the commercial production region in Turkey. Acta Hortic. 1226, 205-212
Corylus avellana, continental ecology, cultivar performance, yield, size, blanching, percent kernel