*3.1. Evapotranspiration and Climate Conditions in the Greenhouse*

To determine the relationship between evapotranspiration and temperature in the greenhouse and interpret the temperature and ET0 changes during the different canola growing stages (germination, growing, and harvesting), daily average ET0 rates and temperature data were collected between 4 November 2018 (planting) and 4 February 2019 (first harvesting). According to the result obtained from ETgages, the lowest and highest temperature in the greenhouse were determined as 15.5 ◦C and 29.5 ◦C, respectively (Figure 2). The lowest temperatures were observed during the first 10 days after planting because of extreme cold ambient temperatures. The temperatures in the greenhouse were 25 ± 5 ◦C from 14 November 2018 to 4 February 2019.

**Figure 2.** Measured daily air temperature (◦C) and ET0 values in the greenhouse. (ET0 is reference crop evapotranspiration).

The lowest daily ET0 was measured as 3.80 mm during the germination stage of canola (Figure 2). After 10 days of planting (when the canola was germinating and emerging), ET0 rates fluctuated, with the highest ET0 measured at 7.80 mm. Cumulative ET0 was calculated as 577 mm during the entire experimental period (92 days). Fluctuations in air temperature influenced evapotranspiration. When the greenhouse temperature dropped from time to time, ET0 also decreased accordingly.
