FIG. 5.

(A) Relationships shown by Kobayashi et al. (2006) between the number of fertile spikelets at harvest and nitrogen (N) accumulated through to panicle initiation (PI), in which observations in a rice FACE experiment for current CO₂ and elevated are shown (as indicated in key), with the curve fitted to the FACE data (solid line) and the relationship (dashed line with triangles) reported by Horie et al. (1997). (B) Data re-analysed by correcting for the difference in average grain weight between the variety used in the FACE and that used by Horie et al. (1997) in such a way that the y-axis is represented as the full sink capacity i.e. number of fertile spikelets × average single grain dry-mass (DM) weight.