Summary: Soybean variety 'Punjab-1' was sown in the research area of the Ranchi Agricultural College, Kanke, Ranchi, for studying the effect of the three growth regulators, viz.: Cycocel (CCC), Regim-8 (TIBA), and Ethrel (CEPA), on the crop yield. All the three chemicals significantly out-yielded the control. The maximum yield (2914 kg/ha), however, was ob-tained as the result of one foliar spray of Cycocel (750 cc/ha) 10 days af-ter flowering. which was closely followed by Regim-8 at 100 cc/ha (2790 kg/ ha).