Performances of some sweet cherry cultivars (Prunus avium L.) under the subtropical climatic conditions and researches to the solution of multiple pistil

This study was carried out at the experimental areas of Pozantı Agricultural Research and Application Center both in Adana and Pozantı during 2006 and 2008. The performances of (Na-1, Early Van Compact, Bing Spur, Lapins and Cristobalina) cherry cultivars grown in subtropical regions were investigated and reducing of double fruit formation usually seen in subtropical regions, was aimed. The same cultivars in Pozantı except Cristobalina were tested for performance comparison. Among the factors that affecting the performances of the cultivars such as dormancy (chilling requirement, growing degree hours, growth regulators (ABA and GA3), fertilization biology (In vitro pollen viability, germination ability, pollen production and percentage of normal pollen), phenological and pomological characteristics were determined. Cultivars showed significant differences depending on the years, regions and the climatic changesFlower bud differantation in Adana was determined by stereo microscope and photografted. Morphological differentiation period in cherries initiate June and continued until the end of July, beginning of August.Shading system with 55% of light transmission decreased the temperature 1.9 on 3.1oC degrees. As a result of reduction in temperature double pistil formation was decreased for about 60.89%- 27.81%. Also, the temperatures over 30°C increased double fruit formation during the differentiation period.