Fig. 2: Time course of solar irradiation

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

4 RESULTS

4.1 Environmental conditions for growing

4.1.1 Solar irradiation

Solar irradiation was allowed to come into the greenhouse. Therefore, incoming solar irradiation was affecting plant development and was regularly measured. The natural light level was low during the whole growth period. The value was after transplanting less than 1 kWh/m2 at the beginning of November and was staying at this value until the end of January. With longer days increased solar irradiation naturally continuously, however with up to 3 kWh/m2 was this value still low (Fig. 2).

Fig. 2: Time course of solar irradiation.

Solar irradiation was measured every day and values for one week were cumulated.

Fig. 2: Time course of solar irradiation

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

4 RESULTS

4.1 Environmental conditions for growing

4.1.1 Solar irradiation

Fig. 2: Time course of solar irradiation.

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

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Fig. 40: Profit margin in relation to yield with different heights of the lights in tomato production – calculation scenarios

Fig. 39: Profit margin in relation to yield with different light sources in tomato production – calculation scenarios

Fig. 38: Profit margin in relation to the light treatment

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

Fig. 35: Revenues at different light treatments

Tab. 8: Energy costs and investment into lights for one growing circle of tomatoes under different light treatments

Fig. 32: Sugar content of tomatoes

This article is from:

Rit LbhÍ nr 151