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Table 5

Annual rate of return and size of hydroponic water reuse systems

Food production (tomatoes) Lighting and heatingOrnamental plant production (Chrysanthemum) Lighting and heating
withwithoutwithwithout
Large-scale Open system 27 ha 27 ha 33 ha 33 ha 
−5% 1% −10% −4% 
Closed system 58 ha 58 ha 51 ha 51 ha 
−5% 0.5% −14% −8% 
Small-scale Open system 3 ha 3 ha 3 ha 3 ha 
6% −12% −17% −12% 
Closed system 6 ha 6 ha 5 ha 5 ha 
6% −12% −19% −13% 
Food production (tomatoes) Lighting and heatingOrnamental plant production (Chrysanthemum) Lighting and heating
withwithoutwithwithout
Large-scale Open system 27 ha 27 ha 33 ha 33 ha 
−5% 1% −10% −4% 
Closed system 58 ha 58 ha 51 ha 51 ha 
−5% 0.5% −14% −8% 
Small-scale Open system 3 ha 3 ha 3 ha 3 ha 
6% −12% −17% −12% 
Closed system 6 ha 6 ha 5 ha 5 ha 
6% −12% −19% −13% 
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