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Article

Quality and Yield of Lettuce in an Open-Air Rooftop Hydroponic System

Department of Engineering Sciences, University of Agder, 4898 Grimstad, Norway
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Author to whom correspondence should be addressed.
Academic Editors: Nikos Tzortzakis, Daniele Massa and Bart Vandecasteele
Agronomy 2021, 11(12), 2586; https://doi.org/10.3390/agronomy11122586
Received: 5 November 2021 / Revised: 2 December 2021 / Accepted: 14 December 2021 / Published: 19 December 2021
In this study, the yield and growth performance of lettuce in an open-air rooftop hydroponic system were investigated. Lettuce was grown in a closed recirculating nutrient film technique (NFT) unit using a standard nutrient solution (NS). Yield, fresh weight, and nutrient content in the leaf tissue of the harvested lettuce were measured. The results were compared with the results obtained in indoor hydroponic lettuce growth with artificial lightning. Despite strong winds during the growth period, 25% of the total lettuce heads weighed twice the marketable weight; however, 25% of the total lettuce heads were below the marketable weight. A more efficient nutrient uptake was indicated by the lettuces in the rooftop system compared with the uptake in the indoor system. Foliar analysis revealed a higher content of all nutrients in the leaves of rooftop hydroponic lettuce compared with indoor hydroponic lettuce. This study suggests that hydroponic rooftop-grown lettuce can be competitive with their indoor counterparts if the rooftop hydroponic system is protected from extreme weather conditions. View Full-Text
Keywords: rooftop hydroponic; nutrient film technique; indoor hydroponic rooftop hydroponic; nutrient film technique; indoor hydroponic
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MDPI and ACS Style

Ezziddine, M.; Liltved, H. Quality and Yield of Lettuce in an Open-Air Rooftop Hydroponic System. Agronomy 2021, 11, 2586. https://doi.org/10.3390/agronomy11122586

AMA Style

Ezziddine M, Liltved H. Quality and Yield of Lettuce in an Open-Air Rooftop Hydroponic System. Agronomy. 2021; 11(12):2586. https://doi.org/10.3390/agronomy11122586

Chicago/Turabian Style

Ezziddine, Maha, and Helge Liltved. 2021. "Quality and Yield of Lettuce in an Open-Air Rooftop Hydroponic System" Agronomy 11, no. 12: 2586. https://doi.org/10.3390/agronomy11122586

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