Table 2.

Three-way ANOVA of the effects of date, elevated CO₂ treatment, elevated O₃ treatment, and two- and three-way interactions on LAD, LAI, NIR/red, PRI, and the chl. index of soybean. Significant effects are shown in bold.

Effect	Numerator DF	LAD		LAI		NIR/red		PRI		Chl. index
		F-stat	P-value	F-stat	P-value	F-stat	P-value	F-stat	P-value	F-stat	P-value
Date	11 (LAI=16)	–	–	358.34	<0.0001	85.24	<0.0001	112.57	<0.0001	36.48	<0.0001
CO2	1	10.40	0.0104	22.1	0.0012	9.68	0.0040	6.27	0.0181	3.67	0.0656
Date×CO2	11 (LAI=16)	–	–	1.93	0.0216	0.76	0.6794	0.60	0.8210	0.97	0.4797
O3	1	4.39	0.0655	7.41	0.0237	1.48	0.2334	4.83	0.0360	0.35	0.5575
Date×O3	11 (LAI=16)	–	–	1.55	0.0903	0.55	0.8640	1.27	0.2526	0.82	0.6241
CO2×O3	1	8.85	0.0156	6.59	0.0306	1.01	0.3236	0.01	0.9123	0.16	0.6929
Date×CO2×O3	11 (LAI=16)	–	–	1.85	0.0290	0.75	0.6857	0.38	0.9626	1.95	0.0432