PROPAGATION OF SOME IMPORTANT TURKISH HAZELNUT VARIETIES BY CUTTINGS
For hardwood cuttings the best cutting collection time was found out as February and March and the most suitable IBA concentrations as 5000, and 3000 ppm. It was observed that a rooting period of two months is unsufficient for hardwood cuttings. The bottom heat didn't induce the rooting capacity sufficiently but affected the callus formation and root weight per cutting. The highest rooting percentages of hardwood cuttings obtained from Palaz, Sivri and Tombul varieties were 95.0 % (March-5000 ppm), 53.3 % (March-3000 ppm) and 40.0 % (February-1000 ppm), respectively.
During summer, cuttings taken in June and July rooted better than cuttings taken in August. The IBA treatments were beneficial for rooting of soft- and semi-woody cuttings depending on the year at different concentrations. No difference of rooting was found out between two different cutting lengths by the semi-woody cuttings taken in July. The highest rooting percentages of green cuttings obtained from Palaz, Sivri and Tombul varieties were 70.0 % (June 1000 ppm), 41.7 % (August-3000 ppm) and 25.0 % (July-5000 ppm), respectively.
Also no correlation between rooting and callusing was detected generally.