Feeding the reactors: potentials in re-cycled organic fertilisers
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Feeding the reactors: potentials in re-cycled organic fertilisers Anne-Kristin Løes
Received: 15 May 2020 / Accepted: 27 May 2020 # The Author(s) 2020
Abstract There is a large and growing interest in producing proteins, oils and other important commodities in bioreactors. Mineral fertilisers, especially nitrogen (N) and phosphorus (P), are used to supply the living organisms with nutrients, and for growing of fungi, carbon must be applied from sugar or starch products. This input-for-output approach does not contribute to cycling of nutrients and organic matter in the society. Organic*1 agriculture has a strong interest in recycled fertilisers and best utilisation of organic materials, and appliccable products should be developed not only for use in agricultural fields but also for other purposes, such as hydroponics, aquaponics and bioreactors. Animal bones and precipitated struvite from waste water are examples of materials which may be applicable in bioreactors. Containing easily available N and P, recent studies have shown that these materials are valuable for amendment of soil fertility and crop productivity in land-based agriculture. Studies should be initiated to design bioreactors utilising locally available sources of nutrients and organic matter, to make the bioreactors more sustainable and develop organic* farming systems in a context of landless farming.
To distinguish between the term “organic” as in certified organic farming, and “organic” as in soil organic matter, the first notion will be indicated with an asterisk (*).
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