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¹ Gaziosmanpaşa Üniversitesi, Ziraat Fakültesi, Tarla Bikileri Bölümü, Tokat
² Gaziosmanpaşa Üniversitesi, Ziraat Fakültesi, Bitki Koruma Bölümü, Tokat DOI : 10.21566/tarbitderg.281832 - Aim of the present study was to make crosses between some advanced potato clones, some local potato varieties and commercial varieties with superior properties and to produce hybrid seeds. The study started in 2014 spring and continued through the winter of 2015. In 2014, crosses were made in glass and cloth greenhouses and under field conditions in low (650 m) and high (1200 m) altitude locations. Crosses in 2014-2015 winter period were made in a polycarbonate greenhouse. In 2014 summer period under field and cloth greenhouse conditions, 1260 flowers were used for crossing in 14 of the 15 cross combinations. A total of 65 fruits were obtained and they contained 1831 hybrid seeds. During 2014 summer period, excess rainfall and especially high temperatures negatively affected the success of crossing. Therefore, crosses were continued under polycarbonate greenhouse conditions during the winter period. During this period, 1602 crosses were made in 15 combinations and a total of 13302 seeds were obtained in 203 fruits. Percentage of fruit set was 5.2% in crosses made in summer period and 12.7 %in crosses made in winter period. Similarly, number of seeds per fruit set was 28.2 in summer period and 65.5 in winter period. It was found that crossing in summer time was more successful under high altitude field and cloth greenhouse conditions. Keywords : Potato, Solanum tuberosum, emasculation, crossing, hybrid potato seed