Abstract

This research was carried out to determine the Heat Summation Requirments (HSR) of four wine grape cultivars (Cinsaut, Kalecik Karası, Sémillon, Yapıncak). In two year of the vegetation period, by paying to attention to four phenological period of the cultivars such as from the bud bursting to full flowering (I), from the full flowering to véraison (II), from the vérasion to harvest (III) and from the bud bursting to harvest (IV); values of the HS were calculated. From the bud bursting to full flowering, HS values of the two year average (1998-199) in cultivars were found as 379.9 d-d in Cinsaut cv., 378.6 d-d in Kalecik Karası cv., 328.6 d-d in Sémillon cv. and 362.4 d-d Yapıncak cv. By paying to attention to cultivars rank, this values for the other periods were found as 817.1 d-d, 678.7 d-d, 705.6 d-d, 840 d-d (for II. period); 573.4 d-d, 688.3 d-d, 655.4 d-d, 674.1 d-d (for III. period); 1770.4 d-d, 1745.6 d-d, 1721.3 d-d, 1876.4 d-d (for IV. period), respectively. From the bud bursting to harvest, the highest HS values was obtained from the Yapıncak cv. as 1876.4 d-d and it was followed by cv. Cinsaut (1770.4 d-d), cv. Kalecik Karası (1745 d-d) and cv. Sémillon (1721.3 d-d), respectively.