Two experiments were undertaken in the Exp. Field of the Face agric. Noshtohor, Zagazig Univ. in winter seasons of 1987/1988 and 1988/1989 to study the effect of three different levels of P and K fertilizers in combination with seven seed-cojd treatments on flowering, fruit setting and yield of tomato cv. U.C. 97-3. Obtained results showed that seed-cold treatment at —1°C for 12 hrs conthjned with any one of the three used rates of fertilizers resulted in the highest values of number of flowers per plant. Meanwhile, the same seed-cold treatment combined with the second used rate of fertilizers showed the highest percentage of fruit setting. Moreover, flowering time was enhanced by all used seed—cold treatments especially with the treatm ents of —2°c or —3°c or 12 or 24 hrs combined with the second used rate of. fertilizers. The maximum values of number o! fruits per plant and yield per faddari were obtained with seed-cold treatments of keeping tomato seeds at -1°C,
-2°C or —3°C for 12 hrs combined with the medium used level of fertilizers.