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This study was carried out to determine the effect of growing conditions under different altitudes on seed production in different potato crosses in Tokat Province of Turkey in 2015. Plants were grown and crosses were made in open field or net house in Tokat location (altitude 600 m asl.), open field or net house in Artova location (altitude 1200 m asl.), or controlled polycarbonate greenhouse. Fifteen different crosses were made between 12 parent cultivars. Production of hybrid potato seed was considered “crossing success”. Results showed that parent cultivars and cross combinations affected crossing success and no seeds were produced from some combinations while some combinations produced abundant seeds. The highest number of seeds were produced in controlled polycarbonate greenhouse, whereas very low amount of seeds were produced under low altitude (600 m asl.) open field conditions. Polycarbonate greenhouse produced 47.3% of all seeds, while low altitude net house produced 19.8%, high altitude open field produced 15.8%, high altitude net house produced 13.6% and low altitude open field produced 3.5%. It was concluded that for a high crossing success, potato crossing should be made by controlled polycarbonate greenhouse conditions and 23 C0 day / 17 C0 night temperatures produced more hybrid seeds.

EFFECTS OF GROWING CONDITIONS ON CROSSING SUCCESS IN DIFFERENT POTATO(Solanum tuberosum L.)CROSSES