Development of these two varieties took four years of joint efforts by BRRI and IRRI.
Bashar further said BRRI with its own efforts for around eight years developed Hybrid-4, the yield of which is up to 7.5 tons a hectare.
Supreme Seed took five years to develop Hira Dhan-10, and its yield is six tons a hectare.
Now that the hybrid and submergence-resistant varieties are released, these can bring a shift in rice cultivation pattern in the country, he said.
According to official data, the country's aman production last year was 13.1 million tons from 5.85 million hectares of land, while that of boro was 19 million tons from 4.8 million hectares.
