Table 3.
Correlation coefficients determined for canopy temperature and dT with climate conditions measured at the same time, as daily averages and as cumulated values for precipitation
| Climate parameters | Canopy temperature | dT | |
|---|---|---|---|
| °C | °C | ||
| Canopy temperature (TC) | °C | 1 *** | 0.72 |
| Air temperature (TA) | °C | 0.96 ** | 0.51 |
| Daily maximum temperature (TM) | °C | 0.93 * | 0.7 |
| Gust speed | m s−1 | −0.58 | −0.14 |
| Vapour pressure deficit (VPD) | kPa | 0.23 | −0.06 |
| Actual radiation | μmol s−1 m−2 | 0.68 | 0.89 * |
| Precipitation (7 days cumulated) | mm | 0.26 | 0.44 |
| Evapotranspiration (ETo) | mm day−1 | 0.45 | 0.88 * |
| Sun hours | h day−1 | 0.74 | 0.97 ** |
Thermal data from das 1275°Cd, was excluded because plants showed already advanced senescence.
Significance codes are: ‘***’ p-value < 0.001, ‘**’ p-value < 0.01 and ‘*’p-value < 0.05.