Table 5.
Mean values of oil, protein, and antioxidants content of onion seeds as affected by bulb planting time and density (n = 3 ± SD).
| Source of Variance | Oil Content (%) | Proteins (%) | Polyphenols (mg·g−1 f.w.) | Selenium (µg·kg−1 f.w.) |
|---|---|---|---|---|
| Year (Y) | ||||
| 2014 | 15.5 ± 0.13 | 20.6 ± 0.25 | 2.25 ± 0.04 | 243 ± 4.5 |
| 2015 | 15.9 ± 0.20 | 21.0 ± 0.43 | 2.30 ± 0.02 | 250 ± 1.5 |
| n.s. | n.s. | n.s. | n.s. | |
| Planting time (Pt) | ||||
| 20 December | 14.9 ± 0.44 c | 19.7 ± 0.78 c | 2.14 ± 0.09 c | 235 ± 8.0 b |
| 10 January | 15.3 ± 0.46 b,c | 20.4 ± 0.77 b,c | 2.22 ± 0.07 b,c | 243 ± 8.2 b |
| 31 January | 16.0 ± 0.37 a,b | 21.3 ± 0.42 a,b | 2.35 ± 0.04 a,b | 248 ± 4.5 a,b |
| 21 February | 16.5 ± 0.62 a | 22.0 ± 0.70 a | 2.40 ± 0.08 a | 261 ± 8.2 a |
| Plant density per m2 (Bd) | ||||
| 2.0 | 15.5 ± 0.47 | 21.1 ± 0.34 | 2.25 ± 0.04 | 245 ± 3.9 |
| 2.5 | 15.8 ± 0.40 | 20.6 ± 0.54 | 2.34 ± 0.04 | 242 ± 4.3 |
| 3.3 | 15.6 ± 0.33 | 20.9 ± 0.51 | 2.24 ± 0.05 | 253 ± 5.2 |
| 5.0 | 15.8 ± 0.45 | 20.8 ± 0.57 | 2.28 ± 0.07 | 247 ± 6.0 |
| n.s. | n.s. | n.s. | n.s. | |
| Y × Pt | n.s. | n.s. | n.s. | n.s. |
| Y × Bd | n.s. | n.s. | n.s. | n.s. |
| Pt × Bd | n.s. | n.s. | n.s. | n.s. |
| Y × Pt × Bd | n.s. | n.s. | n.s. | n.s. |
Within each column, n.s. not statistically significant; means followed by different letters are significantly different according to the Duncan test at p ≤ 0.05. Mean values ± standard deviations have been reported for the main effects of the experimental factors.