Table 2. Effect of elevated CO2 on grain nutrient accumulations in broomcorn millet per m2 plot surface area.
| Year | Treatment | N | P | K | Fe | Mn | Ca | Mg | Cu | Zn | B |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (g m−2) | (mg m−2) | ||||||||||
| 2013 | CK | 5.61 ± 0.25 | 0.68 ± 0.03 | 0.56 ± 0.01 | 34.47 ± 1.53 | 1.91 ± 0.05 | 9.68 ± 0.26 | 172.88 ± 3.64 | 2.73 ± 0.29 | 10.86 ± 4.54 | 1.41 ± 0.20 |
| EC | 5.32 ± 0.29 | 0.81 ± 0.02 | 0.86 ± 0.04 | 41.54 ± 0.61 | 3.06 ± 0.23 | 10.62 ± 0.40 | 353.94 ± 51.82 | 4.12 ± 0.56 | 17.59 ± 0.28 | 1.68 ± 0.09 | |
| 2015 | CK | 8.05 ± 0.24 | 0.82 ± 0.01 | 0.88 ± 0.02 | 31.22 ± 1.50 | 2.94 ± 0.03 | 11.15 ± 0.13 | 414.50 ± 10.19 | 2.14 ± 0.08 | 15.95 ± 0.17 | 1.69 ± 0.15 |
| EC | 9.10 ± 0.07 | 0.98 ± 0.03 | 0.99 ± 0.07 | 48.24 ± 2.42 | 3.77 ± 0.09 | 14.26 ± 0.69 | 506.67 ± 27.05 | 3.41 ± 0.48 | 20.21 ± 0.44 | 2.63 ± 0.11 | |
| 2016 | CK | 10.49 ± 0.17 | 1.00 ± 0.03 | 1.07 ± 0.03 | 52.98 ± 0.32 | 4.15 ± 0.12 | 13.87 ± 1.08 | 495.21 ± 2.74 | 5.93 ± 1.88 | 24.87 ± 0.43 | 1.75 ± 0.23 |
| EC | 13.28 ± 0.03 | 1.33 ± 0.05 | 1.31 ± 0.03 | 51.92 ± 2.32 | 5.47 ± 0.17 | 18.05 ± 0.53 | 628.75 ± 23.51 | 5.12 ± 0.25 | 33.37 ± 0.62 | 2.99 ± 0.07 | |
| Year | *** | *** | *** | *** | *** | *** | *** | * | *** | *** | |
| ANOVA | CO2 | *** | *** | *** | *** | *** | *** | *** | ns | *** | *** |
| CO2× year | *** | *** | ns | *** | ns | * | ns | ns | ns | * | |