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Nutrient Management in Aquaponics: Comparison of Three Approaches for Cultivating Lettuce, Mint and Mushroom Herb

1
Department of Life and Environmental Science, Università Politecnica delle Marche, via Brecce Bianche, 60131 Ancona, Italy
2
Institute for Natural Resource Sciences, Zurich University of Applied Sciences, Grüental, 8820 Wädenswil, Switzerland
*
Author to whom correspondence should be addressed.
Agronomy 2018, 8(3), 27; https://doi.org/10.3390/agronomy8030027
Received: 10 February 2018 / Revised: 3 March 2018 / Accepted: 5 March 2018 / Published: 7 March 2018
Nutrients that are contained in aquaculture effluent may not supply sufficient levels of nutrients for proper plant development and growth in hydroponics; therefore, they need to be supplemented. To determine the required level of supplementation, three identical aquaponic systems (A, B, and C) and one hydroponic system (D) were stocked with lettuce, mint, and mushroom herbs. The aquaponic systems were stocked with Nile tilapia. System A only received nutrients derived from fish feed; system B received nutrients from fish feed as well as weekly supplements of micronutrients and Fe; system C received the same nutrients as B, with weekly supplements of the macronutrients, P and K; in system D, a hydroponic inorganic solution containing N, Ca, and the same nutrients as system C was added weekly. Lettuce achieved the highest yields in system C, mint in system B, and mushroom herb in systems A and B. The present study demonstrated that the nutritional requirements of the mint and mushroom herb make them suitable for aquaponic farming because they require low levels of supplement addition, and hence little management effort, resulting in minimal cost increases. While the addition of supplements accelerated the lettuce growth (Systems B, C), and even surpassed the growth in hydroponic (System C vs. D), the nutritional quality (polyphenols, nitrate content) was better without supplementation. View Full-Text
Keywords: aquaponics; hydroponics; lettuce; nutrient; floating raft culture; tilapia; nitrogen; phosphate aquaponics; hydroponics; lettuce; nutrient; floating raft culture; tilapia; nitrogen; phosphate
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MDPI and ACS Style

Nozzi, V.; Graber, A.; Schmautz, Z.; Mathis, A.; Junge, R. Nutrient Management in Aquaponics: Comparison of Three Approaches for Cultivating Lettuce, Mint and Mushroom Herb. Agronomy 2018, 8, 27.

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