AARES 52nd Annual Conference Rydges Lakeside Canberra, ACT, Australia 5-8 February 2008 Hybrid Rice: Economic Assessment of a Promising Technology for Sustainable Food Grain Production in Bangladesh Md Abdus Samad Azad, BAA Mustafi and Mahabub Hossian University of Sydney, NSW, Australia Bangladesh Rice Research Institute, Bangladesh International Rice Research Institute, Philippines