The first short statured variety IR8, developed at the International Rice Research Institute (IRRI) also had a combination of other desirable traits such as profuse tillering, dark green and erect leaves for good canopy architecture and sturdy stems. It responded to nitrogenous fertilizer much better and had a higher biomass (about 18 tons) and HI of 0.45. Its yield potential was 8-9 tons per hectare (Chandler 1969).