The result of this study about the response of three new tomato hybrids, i.e. Madeer as a processing type, Alex 63 as a fresh market type and Nema 1400 as a double purpose indicated a highly response to po-tassium fertilization treatment, i.e., soil dressing at two levels, 48 and 96 Kg K20/fed or foliar spray with 2% potassium sulphate solution and 3% liquid potassium oxide 37% comparing with the control. The favoura‌ble treatment was soil dressing at a rate of 96 Kg K20/fed. The results showed no-significant differences between using soil dressing method at a rate of 48 Kg K20/fed. and foliar spray method using 2% potassium sulphate solution or 3% liquid potassium fertilizer on earliness, fruit set and fruit yield. The same treatments was superior for fruit firmness, TSS, fruit lycopene pigment, less acidity content and also reducing weight loss and decay percentage in fresh fruits uptil 6 days after har‌vesting under the room condition and then started to attenuate till 9th day. In addition, the results pointed to the highly response of the pro-cessing hybrid than the others. Madeer hybrid was the best in earliness, yield, fruit characters and the highest in keeping quality. Accordingly, is could be said that, using potassium fertilization at a rate of 96 Kg K20/fed. is very important on the productivity and keeping quality of tomato hybrids, and under lack of potassium sulphate fertilizer, it can use foliar nutrition with 2% potassium sulphate solution or liquid potassium 37% at a rate of 3% under Egyptian cultivation now‌adays,