Optimizing irrigation in urban agriculture for tomato crops in rooftop greenhouses

Urban Farm DB summary

This study investigated the agronomic performance and environmental life cycle impacts of three different fertigation management practices (open, 30% recirculation, and recirculation with a further 15% fresh water reduction) for tomato crops in a rooftop greenhouse in Barcelona. All three practices resulted in similar yields, but the recirculation with reduced fresh water input was the most water-efficient, requiring 48.7 liters per kg of tomato. In terms of environmental performance, the recirculation practice showed the best performance in most impact categories, particularly in marine and freshwater eutrophication, with 44% and 93% fewer impacts than the open management.