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

has to be taken into account that the profit margin depends much on the actual price of the LEDs.

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

5 DISCUSSION

In winter production, the success of vegetable growing strongly depends on supplemental lighting. In this experiment, the effect of two light sources in young plant production in continuous production and the effect of the light treatment in continuous production was tested on tomatoes.

5.1 Yield in dependence of the light source in young plant production

When tomatoes were lighted either with HPS or LED top lights in young plant production, the total and marketable yield of tomatoes and their number was independent of the light source, which was in accordance to Stadler (2020). However, harvest started half a week earlier when tomatoes received LEDs in young plant production. Also, strawberry plants under HPS lights showed a delayed growth that was one week behind the development of strawberries treated with LEDs and increased temperature (Stadler, 2019), while strawberries in the LED treatment were

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

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

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

5 DISCUSSION

5.1 Yield in dependence of the light source in young plant production

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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

Fig. 35: Energy use efficiency (= marketable yield per used energy) for tomatoes under different light sources

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

This article is from:

Rit LbhÍ nr 143