University study shows sunlight and roof age drive urban tomato yields
An eight-year analysis by ICTA-UAB researchers published in Agronomy for Sustainable Development explains how light and nutrients affect rooftop greenhouse crops.
Light determines crop success
The study evaluated eleven tomato cycles between 2015 and 2023 to find the main drivers of productivity. Available solar radiation was identified as the single most decisive factor for overall yield performance in the facility.
Roof degradation reduced output
Natural wear on the plastic roof panels led to a 31 percent drop in production during the eight-year period. Replacing these deteriorated coverings in 2023 caused yields to surge by more than 56 percent compared to the previous year.
Maintenance schedule updated
Researchers now recommend replacing roof coverings every four to six years instead of the ten years usually suggested by manufacturers. Using wastewater-recovered fertilizers and periodically swapping plastic parts also maximizes crop performance while preventing pollution.
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