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Harvesting our fertilisers from the sea - an approach to close the nutrient gaps in organic farming

Løes, Anne-Kristin; Ahuja, Ishita and de Boer, Anne (2019) Harvesting our fertilisers from the sea - an approach to close the nutrient gaps in organic farming. Paper at: Organic World Congress, Rennes, France, September 23-25, 2020. [Submitted]

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Summary

Organic production in Europe is currently dependent on the input of fertilisers derived from conventional agriculture, such as farmyard manure, slurry and fertilisers derived from slaugther residues. A significant part of the nutrient flows in our food systems goes in one direction, from land to sea, via sewage and leaching. Harvesting marine organisms for fertilisation, or utilising residual materials e.g. from fish industry as fertilisers, may close such nutrient gaps and promote active cycling of nutrients. At NORSØK, we are studying the use of algae fibre (rich in potassium (K), magnesium and sulphur) and fishbones (rich in nitrogen (N) and phosphorus (P)) as fertilisers. High yields were produced with fishbones, and the short-term N availablity was much higher than for mineral N fertiliser or dried poultry manure. Plants with a long period of nutrient uptake benefited from algae fertiliser. However, seaweeds contain significant amounts of arsenic (As), and easily available K may impact a balanced mineral content in the food or feed product. Excess P in the fishbones may cause eutrophication if this fertiliser is applied to cover the N demands of the crop. Research is needed to make a well balanced fertiliser.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:arsenic, fish-based fertiliser, nitrogen, phosphorus, plant nutrient uptyake, seaweed fertiliser, algae
Subjects: Crop husbandry > Composting and manuring
Farming Systems > Farm nutrient management
Research affiliation: European Union > Horizon 2020 > Organic-PLUS
Norway > NORSØK - Norwegian Centre for Organic Agriculture
H2020 or FP7 Grant Agreement Number:774340
Related Links:https://organic-plus.net/, https://www.norsok.no/en/projects/2018/pathways-to-phase-out-contentious-inputs-from-organic-agriculture-in-europe-organic-plus, https://www.norsok.no/en/projects/2017/marine-rest-raw-materials-for-fertilizers-to-organic-agriculture-restor
Deposited By: Løes, Anne-Kristin
ID Code:36839
Deposited On:22 Nov 2019 12:20
Last Modified:22 Nov 2019 12:20
Document Language:English
Status:Submitted
Refereed:Not peer-reviewed

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