Fig. 3: Soil temperature

4.1.3 Soil temperature

Soil temperature was measured weekly at low solar radiation at 10.00 (except on 15.02 was measured at 12.00) and fluctuated between 14-19 °C. Soil temperature was most of the time significantly higher in the HPS chamber compared to the LED chamber. In average amounted the difference about 1 °C. While in the LED chamber no differences between varieties were observed, was the temperature in the pots with Magnum tendentially and sometimes during the latter part of the growing period significantly higher than with Sonata (Fig. 3).

Fig. 3: Soil temperature.

Letters indicate significant differences during the growing period (HSD, p ≤ 0,05).

4.1.4 Leaf temperature

Leaf temperature was measured weekly at low solar radiation at 10.00 (except on 15.02 was measured at 12.00). Leaf temperature fluctuated between 12-20 °C. Leaf temperature was most of the time higher in the HPS chamber compared to the LED chamber. In average was the leaf temperature nearly 3 °C higher in the HPS chamber. Differences between varieties were not observed (Fig. 4).