Table 1.
Carbon dioxide concentration, temperature and relative humidity (mean ± SD) inside OTCs during 2013 and 2014. Elevated [CO2] was imposed from panicle initiation until maturity (during the day time), while heat treatment was imposed from heading until maturity. ∆ indicates difference in respective parameter within the experiment. a[CO2] – ambient [CO2], e[CO2] – elevated [CO2] and e[CO2] + HT– elevated [CO2] + heat treatment. The data shown for 2014 is from heading to physiological maturity, before this period there were no significant difference in the environmental parameters.
| Environmental Parameters | 2013 | 2014 | ||||
|---|---|---|---|---|---|---|
| a[CO]2 | e[CO2] | ∆ | e[CO2] | e[CO2] + HT | ∆ | |
| [CO2] concentration (ppm) | 384.2 ± 11.5 | 582.1 ± 49.9 | 197.9 | 569.3 ± 48.2 | 571.5 ± 46.5 | 2.2 |
| Day temperature (°C) (0700 to 1900 h) | 30.9 ± 4.9 | 31.9 ± 5.1 | 1.1 | 33.6 ± 3.3 | 37.1 ± 3.0 | 3.5 |
| Night temperature (°C) (2000 to 0600 h) | 25.6 ± 4.5 | 25.8 ± 4.4 | 0.2 | 27.8 ± 3.4 | 28.7 ± 3.5 | 0.9 |
| Day relative humidity (%) (0700 to 1900 h) | 77.1 ± 12.5 | 80.0 ± 11.8 | 2.9 | 61.9 ± 10.7 | 65.0 ± 11.1 | 3.1 |
| Night relative humidity (%) (2000 to 0600 h) | 86.1 ± 9.3 | 86.5 ± 9.3 | 0.4 | 79.1 ± 6.6 | 80.5 ± 7.1 | 1.4 |