Table 3. Effect of elevated CO₂ on grain protein, starch and oil accumulation in broomcorn millet per m² plot surface area.

Year	Treatment	Protein	Starch	Oil
		(g m−2)
2013	CK	35.09 ± 1.54	163.85 ± 4.44	8.81 ± 0.60
	EC	33.22 ± 1.84	165.99 ± 5.39	14.40 ± 1.05
2015	CK	50.31 ± 1.52	235.12 ± 1.31	11.71 ± 2.17
	EC	56.89 ± 0.45	281.98 ± 0.54	11.95 ± 0.27
2016	CK	65.58 ± 1.09	287.93 ± 0.33	12.35 ± 0.14
	EC	83.02 ± 0.18	373.27 ± 0.34	14.77 ± 0.00
	Year	***	***	ns
ANOVA	CO2	***	***	**
	CO2× year	***	***	ns