Three rice cultivars (Giza 178, Sakha 101 and Sakha 104)  under five  seed soakingtreatments  (water, ZnSO₄ 2 %, Di ammonium phosphate {DAP} 2%,  GA₃ 120 mg/L,  and cytokinine 75 mg/L) with using  two seed classes (Basic seed and Certified seed)  are studied in two field experiments at El-Senblawin Dakahlia Governorate during 2011 and 2012 seasons.               The aim of this study was to investigate the performance of identify three  rice cultivars studying the genetic purity of tested varieties through the basic and certified seed classes under five soaking  treatments on growth and yield of rice.   The obtained results could be summarized as follows:               Giza 178 cultivar and Sakha104 significantly surpassed the local cultivar Sakha101 in all studied characters in both seasons.              Using basic seed class recorded the highest values of plant height, number of tillers/hill, number of grains /panicle, grain weight /panicle, 1000-grain weight, grain yield /fed in both seasons. While, the certified Sowing seed produced the highest values of panicle length in both seasons.             The obtained results showed significant effect at seed soaking in both seasons. The seed soaking Znso₄ significantly increased plant height, number of tillers/hill, number of   grains/panicle, panicle weight (g) and1000 grain weight in both seasons.           The interaction among Giza 178, basic seed class and seed soaking znso₄ gave the highest values of plant height, number of tillers/hill, panicle length, number of grains/panicle (g),grains/panicle (g), 1000 grain weight, and grain yield (t/fed) of rice.