Table 3.

Effects of [CO₂] (A, ambient; E, elevated) and nitrogen fertilization levels (0g m^–2 and 8g m^–2) on the number of superior and inferior spikelets within a panicle of cultivar Koshihikari in 2011 and the results of an analysis of variance (ANOVA)

N applied	Spikelet number				% of sterile spikelets (%)				Fertile spikelet number				% in total fertile spikelets
(g m–2)	Superior		Inferior		Superior		Inferior		Superior		Inferior		Superior/total		Inferior/total
	A	E	A	E	A	E	A	E	A	E	A	E	A	E	A	E
0	7.0	7.5	5.8	5.8	5.8	7.3	1.3	1.8	6.8	7.3	4.8	4.8	7.8	7.7	5.5	5.2
8	7.5	7.5	8.3	8.5	7.0	5.8	2.0	1.8	7.0	6.8	7.0	7.3	6.7	6.9	6.5	6.8
ANOVAa
CO2	NS		NS		NS		NS		NS		NS		NS		NS
N	NS		***		NS		NS		NS		**		*		*
CO2×N	NS		NS		NS		NS		†		NS		NS		NS

^a †P < 0.1; *P < 0.05; **P < 0.01; ***P < 0.001; NS, not significant.