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Fig. 35: Revenues at different light treatments
Therefore, the revenues increased with more yield (Fig. 35). The light source had no influence on the revenue, whereas a higher profit margin was reached by having the lights closer to the plants.
Fig. 35: Revenues at different light treatments.
When considering the results of previous chapter, one must keep in mind that there are other cost drivers in growing tomatoes than electricity alone (Tab. 10). Among others, those are e.g. the costs for seeds and seedling production (≈ 350 ISK/m2) and transplanting (≈ 480 ISK/m2), costs for gutters (≈ 100 ISK/m2), and watering system (≈ 350 ISK/m2), costs for plant nutrition (≈ 370 ISK/m2), costs for plant protection (≈ 30 ISK/m2), truss support (≈ 70 ISK/m2), CO2 transport (≈ 260 ISK/m2), liquid CO2 (≈ 2.600 ISK/m2), the rent of the tank (≈ 440 ISK/m2), the rent of the green box (≈ 170 ISK/m2), material for packing (≈ 800 ISK/m2), packing costs with the machine from SFG (≈ 330 ISK/m2) and transport costs from SFG (≈ 260 ISK/m2) (Fig. 36).
