Fig. 3: Soil temperature measured by hand

4.1.3 Soil temperature

Soil temperature was measured weekly at low solar radiation at 10.00 and fluctuated between 15-19 °C. Soil temperature was significantly higher in the LED chamber and the increased temperature compared to the HPS chamber. In average amounted the difference about 1,5 °C. No significant differences between varieties were observed, however, the temperature was tendentially higher with Magnum than with Sonata in the LED chamber during the latter part of the growing period (Fig. 3).

Fig. 3: Soil temperature measured by hand.

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

In addition, the soil temperature was continuously recorded by dataloggers. Therefore, this measurement is giving a clearer picture about the soil temperature than the temporally selected measurement by hand. In average was the soil temperature 1 °C higher in the LED chamber. Differences between varieties were not recorded (Fig. 4).