Abstract: This study was conducted to examine the effects of combinations of different levels of nitrogen and phosphorus fertilizers on sexual reproductive characters of potato mother plants using a cross of ♀ MF-II and ♂ TPS-67. Sixteen treatment combinations consisting of each of 4 different levels of N (0, 150, 225 and 300 kg ha-1) and P (0, 60, 120 and 180 kg ha-1) were applied to MF-II. Both N and P had significant effects on the production of inflorescence and berries on TPS yield. Combined treatment with N and P also had significant effects on most of the parameters, except for the weight of large berries and number of TPS berry-1. Out of the 16 treatment combinations, 150 kg N and 60 kg P ha-1 produced the maximum number of berries plant-1 (22.9), whereas 150 kg N and 120 kg P ha-1 produced maximum berry yield (199.2 g) and 150 kg N and 180 kg P ha-1 produced the highest mean berry weight (9.1 g). The highest 100-TPS weight (84.1 mg) was obtained with 300 kg N and 120 kg P ha-1, while the highest TPS yield (136.1 kg ha-1) was obtained with 225 kg N and 120 kg P ha-1. The results of correlation analysis revealed that the yield of TPS was correlated more strongly with both the size and weight of berries and seeds than the number of berries plant-1.