Sunlight and precise nutrient management, keys to success in urban agriculture
Factors such as sunlight and stage-specific nutrient application determine crop success in urban agriculture, far beyond fixed recipes or miracle solutions.
Institute of Environmental Science and Technology
Article reference: Evangelista, G., Villalba, G., Orsini, F., Muñoz-Liesa, J., Arcas-Pilz, V., & Gabarrell, X. (2026). Sustainable resource optimization for tomato cultivation in a rooftop greenhouse: an 8-year case study. Agronomy for Sustainable Development, 46, 49.
Barcelona
07 Oct 2026
Excerpt:
This is demonstrated by an eight-year study conducted by ICTA-UAB in its build-integrated rooftop greenhouse, thermally connected to the facility itself, and located within the university campus.
The research, which evaluated 11 tomato crop cycles between 2015 and 2023, analyzes how to optimize food production in cities sustainably and reduce its environmental impact. The analysis highlights that actions such as periodically replacing plastic roof coverings and utilizing alternatives like wastewater-recovered fertilizers maximize crop performance and prevent pollution.
Regarding solar radiation, the study identified that the amount of available light is the single most decisive factor for productivity. However, the natural and progressive degradation of the greenhouse’s plastic roof panels caused a 31 % decline in production over the eight-year period. When the deteriorated panels were replaced in 2023, yields surged by more than 56 % compared to the previous year. The researchers recommend replacing these roof coverings every 4 to 6 years, rather than the 10 years typically suggested by manufacturers, thereby maintaining high productivity and reducing the overall carbon footprint by 6.7 % to 7.7 %.
Read the complete article here.
Source: https://cityfarmer.info/sunlight-and-precise-nutrient-management-keys-to-success-in-urban-agriculture/
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