Table 3.
The environmental characteristics at different growing stages of Nicotiana tabacum.
| Leaves nutrient concentraations (mean ± SD) | Seasonal characteristics (monthly average) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N (%) | K (%) | Ca (g/kg) | Mg (g/kg) | Cl (%) | Sugar (%) | Nicotine (%) | TMP | TMN | TMX | PRE | VAP | PET | |
| Seedling | 2.4 ± 0.5b | 2.2 ± 0.5b | 26.0 ± 4.7ab | 4.7 ± 0.5b | 0.3 ± 0.1a | 40.5 ± 2.3a | 0.3 ± 0.3b | 11.5 | 4.6 | 18.5 | 29.3 | 4.9 | 3.7 |
| Squaring | 2.5 ± 0.7b | 3.4 ± 0.5a | 19.9 ± 3.6b | 6.8 ± 1.7a | 0.4 ± 0.1a | 31.7 ± 2.4b | 1.7 ± 0.8a | 18.2 | 14.2 | 22.2 | 270.4 | 15.1 | 2.7 |
| Maturing | 4.6 ± 0.4a | 2.2 ± 0.5b | 32.5 ± 8.6a | 5.0 ± 1.3b | 0.3 ± 0.1a | 25.7 ± 5.0c | 2.6 ± 1.2a | 13.1 | 8.7 | 17.5 | 46.9 | 9.6 | 2 |
| p(K-S) | 0.332 | 0.997 | 0.389 | 0.653 | 0.992 | 0.998 | 0.684 | 0.000 | 0.015 | 0.000 | 0.000 | 0.019 | 0.014 |
Different lowercase letters, column wise, represent that the values are significant different among tobacco growing stages at p < 0.05, following multiple comparisons with Duncan test. p(K-S) = p value of Kolmogorov–Smirnov test. The TMP, mean temperature (unit: degrees celsius); TMN, mean minimum temperature (unit: degrees celsius); TMX, mean maximum temperature (unit: degrees celsius); PRE, precipitation rate (unit: mm/month); VAP, vapor pressure (unit: hPa); PET, potential evapo-transpiration (unit: mm/day).