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Total crop N content in above-ground parts and roots per land area at mid-grain filling (a), leaf blade N as a percentage of the total crop N content (b) and panicle N as a percentage of the total crop N content at mid-grain filling in 2007 and 2008. ANOVA P-values are indicated in each panel (**P < 0.01; *P < 0.05; n.s., not significant): year as the main plot, [CO2] as the split plot, and soil and water temperatures (T) as the split–split plot. Values are the means ± SE (n = 3).
