Fig. 3: Substrate temperature

Fig. 43: Profit margin in relation to treatment – calculation scenarios

Fig. 3: Substrate temperature.

Letters indicate significant differences (HSD, p ≤ 0,05).

4.1.4 Leaf temperature

Leaf temperature was measured weekly at low solar radiation at around noon and fluctuated between 15-25°C. On average was the leaf temperature significantly higher in treatments that got LEDs in young plant production compared to plants that got HPS lights in young plant production. Regarding the lighting regime in continuous production (“Hybrid+LED” or “Hybrid”) were no significant differences observed (Fig. 4).

Fig. 3: Substrate temperature

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Fig. 43: Profit margin in relation to treatment – calculation scenarios

Fig. 3: Substrate temperature.

4.1.4 Leaf temperature

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Fig. 43: Profit margin in relation to treatment – calculation scenarios

Tab. 12: Comparision of yield with different treatments and calculation scenarious regarding placement of LED lights

Fig. 42: Profit margin in relation to yield with Hybrid top lighting with(out) LED interlighting in continuous production and either HPS (a) or LED (b) lights in young plant production – calculation scenarios

Fig. 41: Profit margin in relation to yield with different light sources in young plant production and either Hybrid+LED (a) or Hybrid b) in continuous produciton – calculation scenarios

Tab. 11: Marketable yield per cluster with different light treatments

Fig. 40: Profit margin in relation to the light treatment

Tab. 8: Energy costs and investment into lights in seedling production and continuous production for one growing circle of tomatoes under different light sources

Tab. 10: Profit margin of tomatoes at different light treatments

Fig. 37: Revenues at different treatments

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Rit LbhÍ nr 143