Fig. 6. The effect of (top graph) gibberellic acid 3 (GA₃) added to the root zone on days to heading in Super Dwarf rice and (bottom graph) N concentration in hydroponic solution on days to heading. Without GA₃, Super Dwarf headed in 47 d, but the rate of development decreased with additional GA₃. Super Dwarf headed in 48 d under intermediate N stress but required longer time at both high and low N stress.