Ten different chemicals including gibberellic acid (GA3), combinations of , respectively GA3with other chemicals and control (water spray) were first sprayed at 15% panicle emergence and 24hrs after the 1st spray on female parental lines IR 62829A and CRMS 32A of two promising rice hybrids CRHR 1 and CRHR 5, to find out a suitable substitute to GA3 for better panicle exsertion and seed setting in hybrid rice seed production plots. In general, plant height, panicle length, panicle exsertion, seed setting percentage and seed yield increased significantly over the control with the application of different chemicals. The increase was recorded highest under GA3 application as well as treatments with GA3 combinations as compared to other treatments and control. Though GA3 application was found invariably to be more effective in obtaining higher seed setting and seed yield, GA3 alone could be substituted by GA3 combinations with other chemicals cheaper than GA3 to reduce the cost of hybrid seed production.