This experiment was carried out to determine heat accumulation requirements of stone fruits. 7 o C for stone fruits was considered as critical temperature (base temperature) to calculate effective heat summation in degree-days or heat units. The length of growth periods in Ankara were 258 days in 1992 and 267 days in 1993. Effective heat summations in Ankara were 2307 (1992) and 2428 (1993) degree-days above 7 o C. It can be said that the effective heat summation of Ankara is enough of for commercial growing of stone fruit cultivars studied in this experiment.

This experiment was carried out to determine heat accumulation requirements of stone fruits. 7 o C for stone fruits was considered as critical temperature (base temperature) to calculate effective heat summation in degree-days or heat units. The length of growth periods in Ankara were 258 days in 1992 and 267 days in 1993. Effective heat summations in Ankara were 2307 (1992) and 2428 (1993) degree-days above 7 o C. It can be said that the effective heat summation of Ankara is enough of for commercial growing of stone fruit cultivars studied in this experiment.