For more than a decade, farmers in the irrigated area of Karnataka harvested yields of up to 7 t ha-1. No new technologies could help them increase yield further. Therefore, the major objective of the hybrid rice research begun at Mandya was to identify a suitable hybrid that could yield at least 1 t more than the check varieties. This objective was fulfilled by the release in 1994 of Karnataka Rice Hybrid 1 (KRH1) and in 1996 of Karnataka Rice Hybrid 2 (KRH2). The hybrid KRH1 (IR58025A/ IR9761-19-1R) has a yield potential of 7.5-8.5 t ha-1 and matures in 125 d. In 150 on-farm irrigated trials conducted in farmers' fields in different districts, KRH1 had a yield advantage of 1.5 t ha-1 over the check varieties. This hybrid possesses field tolerance for major pests and diseases.