Table 1.
Above-ground shoot dry biomass of maize (g m−2) at silking and maturity harvest used to calculate element acquired.
| Nitrogen | Radiation | Silking | Maturity | |||
|---|---|---|---|---|---|---|
| Lb | Sb | Lb | Sb | Gb | ||
| N0 | UV | 139.9 | 287.9 a | 161.2 b | 563.3 | 666.9 b |
| C | 166.1 | 328.6 a | 192.8 a | 636.9 | 854.4 a | |
| Mean | 153.0 C | 308.2 C | 177.0 D | 600.1 C | 760.6 D | |
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| N1 | UV | 147.1 | 341.9 b | 197.9 b | 682.7 | 916.1 b |
| C | 208.3 | 529.7 a | 243.3 a | 961.2 | 1249.9 a | |
| Mean | 177.7 BC | 435.8 B | 220.6 C | 821.9 B | 1083.0 C | |
|
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| N2 | UV | 168.8 | 385.2 b | 206.2 b | 752.1 | 1015.9 b |
| C | 237.9 | 633.4 a | 296.4 a | 1082.8 | 1499.2 a | |
| Mean | 203.3 B | 509.3 A | 251.3 B | 917.4 B | 1257.5 B | |
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| N3 | UV | 197.6 | 456.5 b | 235.6 b | 885.3 | 1125.6 b |
| C | 275.6 | 636.9 a | 332.3 a | 1204.5 | 1682.8 a | |
| Mean | 236.6 A | 546.7 A | 283.9 A | 1044.9 A | 1404.2 A | |
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| Mean | UV | 163.3 b | 367.9 b | 200.2 b | 720.8 b | 931.1 b |
| C | 222.0 a | 532.1 a | 266.2 a | 971.3 a | 1321.5 a | |
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| ANOVA | ||||||
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| Radiation (R) | *** | *** | *** | *** | *** | |
| Nitrogen (N) | *** | *** | *** | *** | *** | |
| R × N | ns | * | * | ns | * | |
Lb: leaf biomass; Sb: stem biomass; Gb: grain biomass; UV: high UV-B treatment; C: ambient UV-B treatment; N0, N1, N2, N3: 0, 100, 200, and 300 kg N ha−1.
Means within each N level followed by the same letter (capital letters for N effects within each column) were not significantly different at P < 0.10. Significance of main effects: ns: not significant; *P < 0.05, ***P < 0.001.