Digitalization in Small-Scale Urban
Recirculation Aquaculture:
Data Analytics in Sub-Saharan Africa

Food and nutrition insecurity, affecting 30% of the global population in 2020, poses a significant challenge to achieving Sustainable Development Goal (SDG) 2 - Zero Hunger. Urbanization, particularly in sub-Saharan African cities e.g. Lagos, Nigeria, exacerbates these issues, impacting resources and contributing to informal settlements. There is emphasis on innovative solutions in urban farming, with Recirculating Aquaculture Systems (RAS) emerging as one of the promising approach due to its efficiency in space and capital utilization. However, maintaining optimal conditions in RAS, crucial for SDG 2 and 11, requires robust water quality monitoring. This study explores the availability of digital tools for water quality monitoring in small-scale urban RAS, evaluating handheld devices and IoT sensors' reliability through t-test statistical method. The results aim to guide practitioners in selecting effective monitoring tools, contributing valuable insights for sustainable aquaculture in urban areas, particularly in sub-Saharan Africa, where access to affordable digital solutions is pivotal for success and can attract youth to agri-food technologies.

Publications

Aghaji, U.V.; Benjamin, E.O.; Buchenrieder, G. Digitalization in Small-Scale Urban Recirculation Aquaculture: Data Analytics in Sub-Saharan Africa. Preprints 2023, 2023111703.

Evaluation of Growth, Yield and Bioactive Compounds of Ethiopian Kale (Brassica carinata A. Braun) Microgreens under Different LED Light Spectra and Substrates

Microgreens are innovative vegetable products whose production and consumption are gaining popularity globally thanks to their recognized nutraceutical properties. To date, the effects of lighting conditions and growing substrate on the performances of Brassica carinata microgreens (indigenous to Africa) remain underexplored. The present study aimed at providing insights into the influence of different lighting treatments provided by LEDs, namely monochromatic blue (B), red (R), cool white (W) and a combination of three color diodes (B + R + W), and substrates (cocopeat, sand and cocopeat–sand mix (v/v) (1:1)) on the growth, yield and bioactive compounds of B. carinata microgreens. Seeds were germinated in dark chambers and cultivated in growth chambers equipped with LED lighting systems for 14 days under a fixed light intensity of 160 ± 2.5 µmol m−2 s−1 and photoperiod of 12 h d−1. The best performances were associated with the spectrum that combined B + R + W LEDs and with substrate resulting from the cocopeat–sand mix, including the highest yield (19.19 g plant−1), plant height (9.94 cm), leaf area (68.11 mm2) and canopy cover (55.9%). Enhanced carotenoid and flavonoid contents were obtained with B + R + W LEDs, while the B LED increased the total amount of chlorophyll (11,880 mg kg−1). For plants grown under B + R + W LEDs in cocopeat, high nitrate levels were observed. Our results demonstrate that substrate and light environment interact to influence the growth, yield and concentration of bioactive compounds of B. carinata microgreens.

Publications

Maru, R.N.; Wesonga, J.; Okazawa, H.; Kavoo, A.; Neondo, J.O.; Mazibuko, D.M.; Maskey, S.; Orsini, F. Evaluation of Growth, Yield and Bioactive Compounds of Ethiopian Kale (Brassica carinata A. Braun) Microgreens under Different LED Light Spectra and Substrates. Horticulturae 2024, 10, 436. https://doi.org/10.3390/horticulturae10050436

The Disenfranchisement of Practitioners and the Public Sector in Innovative Urban Farming in Sub-Saharan Africa: Insights from Nigeria

Innovative urban farming is crucial for enhancing food security, nutrition, livelihood resilience, and environmental sustainability in Sub-Saharan African cities. However, agricultural policies and extension services often overlook urban contexts, presumably due to resource constraints. Yet, to improve productivity, understanding the challenges and opportunities of innovative urban farming is essential. Exploratory qualitative research, including focus group discussions, was conducted in, Lagos, Nigeria, to gather insights from stakeholders. The analysis, using mind maps and a consensus index, compared the perspectives of private urban farmers and public sector representatives. The urban farmers recognize the potential of circular agri-food technologies, like hydroponics, aquaponics, recirculating aquaculture systems (RAS), drip irrigation, sack farming, and waste upcycling, to boost productivity. However, the urban farmers perceive a lack of public sector support for these innovations. The public sector representatives see the problem as urban farmers’ behavioral and educational shortcomings, particularly their lack of coordination and commitment to adopting innovations. These differing views highlight the complex dynamics between urban farmers and local agricultural policymakers. This study emphasizes the need for structural changes and local-level stakeholder dialogues for developing effective urban farming policies in Sub-Saharan Africa.

Publications

Benjamin EO, Adegoke A, Buchenrieder GR. The Disenfranchisement of Practitioners and the Public Sector in Innovative Urban Farming in Sub-Saharan Africa: Insights from Nigeria. Land. 2024; 13(7):963.